CN1988055B - Copper alloy wire, stranded wire, coaxial cable, manufacturing method thereof and multi-core cable - Google Patents

Abstract

The object of the present invention is to provide an ultra-fine copper alloy wire, an ultra-fine copper alloy stranded wire, an ultra-fine insulation and coaxial cable, which have both high strength characteristics and low resistance characteristics, and high heat resistance, and their Manufacturing method and multicore cable thereof. The ultra-fine copper alloy wire contains 1-3% silver in copper, and the wire diameter is less than 0.025mm. After heat treatment, its tensile strength is above 850MPa, and its conductivity is above 85% IACS; the coaxial cable (20A) is made of An ultra-fine copper alloy stranded wire (3) formed by twisting seven ultra-fine copper alloy wires (1) forms an inner conductor, and then a solid insulator (5a) is coated on the outer periphery of the inner conductor to become an ultra-fine insulated wire ( 10), then on the outer periphery of the ultra-fine insulated wire, a plurality of conductor wires (13) are wound into a spiral shape along the length direction of the ultra-fine insulated wire to form an outer conductor (15), and then coated on the surface of the outer conductor Protective layer (17) forms.

Description

Copper alloy wire, stranded wire, coaxial cable, manufacturing method thereof and multi-core cable

technical field

The present invention relates to an ultra-fine copper alloy wire having high strength and high electrical conductivity, which is difficult to decrease in strength during heat-loaded operations such as extrusion and soldering, and is excellent in heat resistance. Stranded wires, insulated wires, and coaxial cables thereof, their manufacturing methods, and multi-core cables manufactured using them.

Background technique

Alloys having high strength and high conductivity are generally used as conductor materials used in flexure-resistant cables for electronic equipment (eg, robot cables) or flexure-resistant cables for medical equipment (eg, probe cables).

Currently, Cu-Sn alloy wires and Cu-Sn-In alloy wires, which can be produced economically by continuous casting and rolling, are widely used in electronic equipment as copper alloy wires manufactured at a mass production level. and conductor materials for bend-resistant cables for medical equipment. In addition, other copper alloy wires are also applicable to various fields according to product cost and various characteristics of copper alloy wires.

In recent years, with the miniaturization and weight reduction of electronic equipment or the miniaturization of medical equipment, the conductor diameter of the wires used in them is also required to be extremely thin, reaching the level that the conductor diameter is required to be less than Φ0.03mm. With the complexity of the ultrasonic endoscope lens, it can be found that the cable for ultrasonic endoscope has a tendency to further develop in the direction of multi-core (200-260 cores). On the other hand, in order to reduce the pain of the patient, there is also an increased demand for reducing the diameter of the endoscopic lens. The demand for diameter reduction is also notable in coiled cables and the like used when performing intravascular surgery to approach a predetermined affected part from the inside of a blood vessel.

In addition, recently, not only reduction in diameter is required, but also in order to improve bending resistance and increase transmission capacity, there is also a strong demand for the development of conductor materials that have both high strength characteristics and high conductivity characteristics.

The above-mentioned Cu—Sn alloy wire and Cu—Sn—In alloy wire are composed of a copper alloy obtained by adding Sn to reverberatory furnace refined copper as a base metal. However, in Cu-Sn alloy wires, it is necessary to increase the amount of Sn added in order to increase the strength. As a result, the electrical conductivity is lowered, and it is difficult to achieve both strength and electrical conductivity.

On the other hand, Cu—Ag alloys are valued as copper alloys having both high strength and high electrical conductivity. A Cu-Ag alloy excellent in tensile strength and electrical conductivity is produced by, for example, processing a Cu-Ag alloy containing 1.0-15% by weight in copper as follows: ① Cold working the cast rod to reduce the area reduction After reaching 70% or more, ② heat treatment at a temperature of 400-500° C. for 130 hours, and then ③ cold working to achieve a reduction of area of 95 or more (refer to Patent Document 1 - Japanese Patent Application Laid-Open No. 2001-40439).

In addition, it can also be made into ultra-fine copper alloy stranded wire by the following method: add 0.1-1.0% silver to pure copper to form a Cu-Ag alloy, and then make a diameter of 0.01-0.8mm, tensile strength It is a single wire of more than 600 MPa, which is made by twisting the single wire with a predetermined number, and then heat-treating the twisted wire to eliminate the stress during twisting (refer to Patent Document 1 - Japanese Patent Laid-Open 2001 -234309 Bulletin).

When using this kind of ultra-fine copper alloy wire composed of Cu-Ag alloy as a bending-resistant cable, it is generally used after the outer layer is extruded and coated with an insulator with a melting point of about 300°C. However, in this extrusion operation, due to The heat of the insulator during cladding and the thermal load on the head of the extruder degrade the mechanical properties of the ultra-fine copper alloy wire, especially the tensile strength. Furthermore, in the end processing, the tensile strength of the ultra-fine copper alloy wire at the end portion is significantly lowered by the heat of the soldering iron at about 300-350° C. during the soldering operation. Therefore, after extrusion work and soldering work, it may be difficult to ensure both electrical and mechanical properties. In particular, the mechanical reliability of the cable and the processed part of the cable end may be greatly affected due to the decrease in tensile strength. damage. Therefore, as the characteristics required for the ultrafine copper alloy wire, not only high strength and high electrical conductivity must be combined, but also thermal stability such that the strength is not lowered by heat processes such as extrusion work is required.

Also, for example, since ultra-thin wires with a diameter of 0.025 mm or less are used in probe cables for ultrasonic diagnostic apparatuses or cables for ultrasonic endoscopes, resistance corresponding to such conductor sizes becomes a problem. Specifically, in accordance with the American Wire Gauge (AWG-America Wire Gauge) standard, it is required to achieve ultra-fine copper alloy stranded wires that truly achieve both thinner diameters and better electrical characteristics. The relationship between AWG standard and stranded wire structure (number of stranded wires/wire diameter) is 42AWG (7/0.025), 43AWG (70.023), 44AWG (7/0020), 45AWG (7/0018), 46AWG (7/ 0.016), 48AWG(7/0.013), 50AWG(7/0.010).

However, for the Cu-Ag alloy described in Patent Document 1, as a method to achieve both high tensile strength and high electrical conductivity at the same time, it is necessary to heat it at a specific temperature for a long time. (1-30 hours) heat treatment, thus, both reduced production efficiency and improved cost. In addition, there is neither reference nor countermeasure against the reduction in strength due to the thermal history of thermal loads imposed by extrusion work or the like. Also, nothing is said about the resistance corresponding to the size of the conductor having an extremely small diameter.

On the other hand, in the ultrafine copper alloy stranded wire of Patent Document 2, although silver is described as an additive element of the copper alloy, the added amount is as little as 0.1 to 1.0% by weight, and it is not expected to improve the strength. In addition, in this ultra-fine copper alloy stranded wire, although the main purpose of improving the bending characteristics in the plastic deformation field is to ensure the elongation characteristics to be 5% or more, but for the emphasis on the elongation characteristics, the tensile Intensity will inevitably decrease. Therefore, especially for the use of cables for electronic equipment or cables for medical equipment using ultra-thin wires with a diameter of 0.025mm or less, such as probe cables for ultrasonic diagnostic equipment or cables for ultrasonic endoscopes, there is a need for strength. Insufficient, insufficient flexibility.

Contents of the invention

Therefore, the object of the present invention is to solve the above-mentioned problems, and to provide an ultra-fine wire with a final wire diameter of 0.025 mm or less, which has both high strength characteristics and low resistance characteristics (high conductivity), and, in Ultra-fine copper alloy wire and ultra-fine copper alloy wire with high heat resistance are difficult to decrease in strength under heat loads such as extruding and soldering operations of coaxial cables using ultra-thin wires. Alloy stranded wire, micro-insulation and coaxial cables, their manufacturing methods, and multi-core cables using them.

In order to achieve the above-mentioned purpose of the invention, the ultra-fine copper alloy wire of the present invention is a wire diameter of 0.010-0.025mm, made of silver (Ag) containing 1-3% by weight, the rest being copper (Cu) and unavoidable impurities. Thin copper alloy wire, its tensile strength is above 850 MPa, its electrical conductivity is above 85% IACS, and its elongation is 0.5-3.0%; and, after heat treatment at a temperature below 350°C and for a time below 5 seconds, the heat-treated The decrease rate [(1-σ _h1 /σ _h0 )×100%] of the tensile strength (σ _h1 ) relative to the tensile strength (σ _h0 ) before heat treatment is 2% or less. ,

A plating layer of tin (Sn), silver (Ag) or nickel (Ni) may be formed on the surface of the alloy wire.

A plurality of ultrafine copper alloy wires can be twisted to form an ultrafine copper alloy stranded wire. The above-mentioned ultra-fine copper alloy stranded wire, the resistance of the stranded wire formed by twisting 7 above-mentioned ultra-fine copper alloy wires with a wire diameter of 0.025mm at 20°C is below 6000Ω/km; The resistance of the stranded wire made by twisting the above-mentioned ultra-fine copper alloy wires of 0.023mm at 20°C is below 7000Ω/km; The resistance of the stranded wire at 20°C is below 9500Ω/km; the resistance of the stranded wire formed by twisting the above-mentioned ultra-fine copper alloy wires with a diameter of 0.018mm at 20°C is below 11500Ω/km; The resistance of the stranded wire formed by twisting seven above-mentioned ultra-fine copper alloy wires with a diameter of 0.016mm at 20°C is below 15000Ω/km; The resistance of the twisted stranded wire at 20°C is below 22000Ω/km; the resistance of the stranded wire formed by twisting 7 above-mentioned ultra-fine copper alloy wires with a diameter of 0.010mm at 20°C is 38000Ω /km or less.

In order to achieve the purpose of the above invention, the method of manufacturing the ultra-fine copper alloy wire of the present invention is characterized in that 1-3% by weight of silver is added to pure copper to form a copper alloy, and the wire drawing process is performed to make the wire diameter 0.010-0.025 mm ultra-fine copper alloy wire, heat treatment at 300-500°C for 0.2-5 seconds to make the tensile strength above 850MPa, the electrical conductivity above 85% IACS, and the elongation 0.5-3.0 %; and, after heat treatment at a temperature below 350°C and a time of 5 seconds or less, the reduction rate of the tensile strength (σ _h1 ) after heat treatment relative to the tensile strength (σ _h0 ) before heat treatment [(1- σ _h1 /σ _h0 )×100%] is an ultra-fine copper alloy wire with 2% or less.

(after making the above-mentioned ultra-fine copper alloy wire with a wire diameter of 0.010-0.025mm, it is also possible to form a coating of tin (Sn), silver (Ag), nickel (Ni) on the surface of the ultra-fine copper alloy wire process.

In addition, the manufacturing method of the ultra-fine copper alloy stranded wire of the present invention is characterized in that 1-3% by weight of silver is added to pure copper to form a copper alloy, and wire drawing is performed to produce an ultra-fine strand with a wire diameter of 0.010-0.025 mm. After the copper alloy wire, a plurality of the above-mentioned ultra-fine copper alloy wires are twisted to form an ultra-fine copper alloy stranded wire, and the above-mentioned ultra-fine copper alloy wire is made by heat treatment at a temperature of 300-500°C for 0.2-5 seconds. Alloy stranded wire.

In order to achieve the above-mentioned purpose of the invention, the feature of the ultra-fine insulated wire of the present invention is that a plurality of wire diameters consisting of 1-3% by weight of silver (Ag), the rest being copper (Cu) and unavoidable impurities are 0.010 - 0.025 mm ultra-fine copper alloy wires are stranded to form ultra-fine copper alloy stranded wires, the tensile strength of the above-mentioned ultra-fine copper alloy stranded wires is above 850 MPa, and the electrical conductivity is above 85% IACS; and, in the above The outer circumference of the ultra-fine copper alloy stranded wire is covered with a solid insulator with a thickness of less than 0.07mm.

The ultra-fine copper alloy stranded wire is preferably a heat-treated stranded wire, the resistance reduction rate after the heat treatment is 6% or more, and the tensile strength reduction rate after the heat treatment is 20% or less.

A plating layer of tin (Sn), silver (Ag) or nickel (Ni) may be formed on the surface of the copper alloy wire.

In order to achieve the above-mentioned purpose of the invention, the method of manufacturing the ultra-fine insulated wire of the present invention is characterized in that 1-3% by weight of silver is added to pure copper to form a copper alloy, and wire drawing is performed to make a pole with a wire diameter of 0.010-0.025mm. After the thin copper alloy wires, a plurality of the above-mentioned ultra-fine copper alloy wires are twisted to form an ultra-fine copper alloy stranded wire, and after heat treatment at a temperature of 300-500°C for 0.2-5 seconds, the The outer circumference of the twisted wire is covered with a solid insulator with a thickness of less than 0.07mm.

In order to achieve the purpose of the above invention, the coaxial cable of the present invention is formed on the outer circumference of the above-mentioned ultra-fine insulated wire with a plurality of conductor wires wound in a spiral shape along the length direction of the above-mentioned ultra-fine insulated wire. The surface of the conductor is covered with a protective layer.

It can be made into the following coaxial cable: the coaxial cable in which the diameter of the copper alloy wire constituting the above-mentioned ultra-fine insulated wire is greater than 0.021mm and less than 0.025mm, the resistance is less than 7200Ω/km, and the electrostatic capacitance is 100-130pF /m, the attenuation is 0.6-1.0db/m (frequency is 10MHz), and the service life of bending 90 degrees left and right is more than 20,000 times under the conditions of bending radius R=2mm and load=50g; the copper that constitutes the above-mentioned ultra-fine insulated wire The coaxial cable whose alloy wire diameter is greater than 0.018mm but less than 0.022mm has a resistance of less than 9500Ω/km, an electrostatic capacitance of 100-130pF/m, and an attenuation of 0.8-1.2db/m (frequency 10MHz) , the life of bending 90 degrees left and right is more than 20,000 times under the conditions of bending radius R = 2mm and load = 50g; the diameter of the copper alloy wire that constitutes the above-mentioned ultra-fine insulated wire is coaxial A cable with a resistance of 12200Ω/km or less, an electrostatic capacitance of 100-130pF/m, an attenuation of 1.0-1.5db/m (frequency 10MHz), and a life span of 90 degrees of bending radius R = 2mm, load = 50g Under the condition of 20000 times or more; the diameter of the copper alloy wire constituting the above-mentioned ultra-fine insulated wire is greater than 0.014mm but less than 0.018mm in the coaxial cable, its resistance is 14700Ω/km or less, and the electrostatic capacitance is 100-130pF/ m, the attenuation is 1.1-1.6db/m (frequency is 10MHz), and the service life of bending 90 degrees left and right is more than 30,000 times under the conditions of bending radius R = 2mm and load = 50g; the copper alloy that constitutes the above-mentioned ultra-fine insulated wire The coaxial cable whose wire diameter is greater than 0.013mm and less than 0.017mm has a resistance of less than 16500Ω/km, an electrostatic capacitance of 100-130pF/m, and an attenuation of 1.3-1.8db/m (frequency 10MHz). The service life of bending 90 degrees left and right is more than 30,000 times under the conditions of bending radius R = 2mm and load = 20g; the coaxial cable whose wire diameter of the copper alloy wire constituting the above-mentioned ultra-fine insulated wire is greater than 0.011mm and less than 0.015mm , the resistance is below 22500Ω/km, the electrostatic capacitance is 100-130pF/m, the attenuation is 1.7-2.4db/m (frequency is 10MHz), and the service life of bending 90 degrees left and right is in the bending radius R = 2mm, load = 20g More than 30,000 times under certain conditions; the coaxial cable whose diameter of the copper alloy wire constituting the above-mentioned ultra-fine insulated wire is greater than 0.010mm and less than 0.012mm has a resistance of less than 38000Ω/km and an electrostatic capacitance of 100-130pF/m , the attenuation is 2.5-3.8db/m (frequency is 10MHz), and the service life of bending 90 degrees left and right is at bending radius R=2mm, load = 10,000 times or more under the condition of 20g.

In order to achieve the above-mentioned purpose of the invention, the manufacturing method of the coaxial cable of the present invention is characterized by: adding 1-3% by weight of silver to pure copper to form a copper alloy, and performing wire drawing to make a very thin cable with a wire diameter of 0.010-0.025mm. After the copper alloy wire, a plurality of the above-mentioned ultra-fine copper alloy wires are twisted to form an ultra-fine copper alloy stranded wire, and after heat treatment at a temperature of 300-500°C for 0.2-5 seconds, the The outer circumference of the combined wire is coated with a solid insulator with a thickness of 0.07mm or less to form an ultra-fine insulated wire, and then on the outer circumference of the above-mentioned ultra-fine insulated wire, a plurality of conductor wires are wound in a spiral shape along the length direction of the above-mentioned ultra-fine insulated wire After the outer conductor is formed, a protective layer is coated on the surface of the outer conductor.

In order to realize the above-mentioned invention object, the feature of the coaxial cable of the present invention is that a plurality of silver (Ag) by containing 1-3 weight %, all the other are copper (Cu) and unavoidable impurity constituted wire diameter is 0.010- 0.025mm ultra-fine copper alloy wires are stranded to form ultra-fine copper alloy stranded wires, the tensile strength of the above-mentioned ultra-fine copper alloy stranded wires is above 850 MPa, and the electrical conductivity is above 85% IACS; The outer periphery of the fine copper alloy stranded wire is covered with a foam insulator, and then formed on the outer periphery of the above foam insulator along the length direction of the above-mentioned ultra-fine copper alloy stranded wire. A protective layer is coated on the surface of the outer conductor.

The ultra-fine copper alloy stranded wire is preferably a heat-treated stranded wire, the resistance reduction rate after the heat treatment is 6% or more, and the tensile strength reduction rate after the heat treatment is 20% or less.

A tin (Sn), silver (Ag) or nickel (Ni) plated layer may be formed on the surface of the copper alloy wire.

It can be made into the following coaxial cable: the coaxial cable whose diameter of the above-mentioned ultra-fine copper alloy wire is greater than 0.021mm but less than 0.025mm, its resistance is less than 7500Ω/km, and the electrostatic capacitance is 30-80pF/m; The coaxial cable whose wire diameter is greater than 0.018mm and less than 0.022mm has a resistance of less than 10000Ω/km and an electrostatic capacitance of 30-80pF/m; the diameter of the above-mentioned ultra-fine copper alloy wire is greater than 0.016mm and less than 0.020mm coaxial cable, its resistance is less than 13000Ω/km, electrostatic capacitance is 30-80pF/m; Cables with a resistance of 15500Ω/km or less and an electrostatic capacitance of 30-80pF/m; coaxial cables with a diameter greater than 0.013mm but less than 0.017mm of the above-mentioned ultra-fine copper alloy wires with a resistance of 17000Ω/km or less, The electrostatic capacitance is 30-80pF/m; the coaxial cable whose diameter of the above-mentioned ultra-fine copper alloy wire is greater than 0.011mm but less than 0.015mm has a resistance of less than 23500Ω/km and an electrostatic capacitance of 30-80pF/m; the above-mentioned The coaxial cable whose wire diameter is more than 0.010mm but less than 0.012mm has a resistance of less than 40000Ω/km and an electrostatic capacitance of 30-80pF/m.

In order to achieve the above-mentioned purpose of the invention, the manufacturing method of the coaxial cable of the present invention is characterized in that 1-3% by weight of silver is added to pure copper to form a copper alloy, and the wire drawing process is made into a very thin cable with a wire diameter of 0.010-0.025mm. After the copper alloy wire, a plurality of the above-mentioned ultra-fine copper alloy wires are twisted to form an ultra-fine copper alloy stranded wire, and after heat treatment at a temperature of 300-500°C for 0.2-5 seconds, the After the outer periphery of the combined wire is coated with a foam insulator with a thickness of less than 0.28mm, a skin layer is formed, and then on the outer periphery of the skin layer, a plurality of conductor wires are wound into a spiral shape along the length direction of the above-mentioned copper alloy stranded wire. After the outer conductor is formed, a protective layer is coated on the surface of the outer conductor.

Furthermore, a multi-core cable may be formed by twisting a plurality of the above-mentioned coaxial cables on the tension members or on the outer circumference of the core wires.

It is also possible to form a multi-core cable by twisting a plurality of the above-mentioned coaxial cables and the above-mentioned extra-fine insulated wires on the tension members or on the outer circumference of the core wires.

A multi-core cable can also be formed by twisting a plurality of the above-mentioned extra-fine insulated wires on the tension member or on the outer periphery of the core wire.

A multi-core cable may be formed by twisting a plurality of coaxial cable units obtained by bundling a plurality of the above-mentioned coaxial cables on the tension member or on the outer periphery of the core wire.

A multi-core cable can also be formed by winding a plurality of the above-mentioned extra-fine insulated wires around the central conductor wire at certain intervals.

It is also possible to configure a multi-core cable by arranging a plurality of the above-mentioned coaxial cables in parallel at a certain pitch.

According to the present invention, it is possible to provide an ultra-fine wire with a final wire diameter of 0.025 mm or less, which has both high strength characteristics and low resistance characteristics (high electrical conductivity), is hard to decrease in strength even when subjected to a heat load, and has high heat resistance. Sexual ultra-fine copper alloy wire, ultra-fine copper alloy stranded wire, ultra-fine insulated wire, coaxial cable and multi-core cable.

Description of drawings

Fig. 1 is a cross-sectional view of an ultrafine copper alloy wire according to one embodiment of the present invention.

Fig. 2 is a cross-sectional view of an ultrafine copper alloy stranded wire according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of a plated ultrafine copper alloy wire according to one embodiment of the present invention.

Fig. 4 is a cross-sectional view of a plated ultrafine copper alloy stranded wire according to an embodiment of the present invention.

Fig. 5 is a cross-sectional view of an ultrafine insulated wire according to an embodiment of the present invention.

Fig. 6 is a cross-sectional view of a coaxial cable according to an embodiment of the present invention.

Fig. 7 is a cross-sectional view of a coaxial cable according to another embodiment of the present invention.

Fig. 8 is a cross-sectional view of a multi-core cable according to an embodiment of the present invention.

Fig. 9 is a cross-sectional view of a multi-core cable according to another embodiment of the present invention.

Fig. 10 is a cross-sectional view of a multi-core cable according to still another embodiment of the present invention.

Fig. 11 is a cross-sectional view of a multi-core cable according to still another embodiment of the present invention.

Fig. 12 is a side view of a multi-core cable according to another embodiment of the present invention.

Fig. 13 is a cross-sectional view of a multi-core cable according to another embodiment of the present invention.

Detailed ways

First, the ultrafine copper alloy wire of the present invention will be described.

FIG. 1 shows an ultrafine copper alloy wire according to this embodiment.

This ultra-fine copper alloy wire 1 is a Cu-Ag alloy wire with a wire diameter of 0.025-0.010mm, containing 1-3% by weight of silver, preferably 1.5-2.5% by weight of silver, and having a tensile strength of more than 850MPa and being conductive. The rate is above 85% IACS, and the elongation rate is 0.5-3.0%.

The reason why the silver content is 1-3% by weight is because if it is less than 1% by weight, the improvement of strength cannot meet the requirements, and if it exceeds 3% by weight, the strength will increase but the conductivity will decrease. Furthermore, by making the silver content preferably in the range of 1.5 to 25% by weight, performances excellent in both strength characteristics and conductivity characteristics can be obtained. In addition, when the tensile strength is above 850MPa, the electrical conductivity is above 85% IACS, and the elongation is 0.5-3.0%, considering the situation of cables for medical equipment, the above range can meet the requirements of bendability, resistance, flexibility, etc. The requirements of various characteristics such as, but outside the above range, these characteristics cannot be met.

In addition, the reduction rate of the tensile strength (σ _h1 ) after the heat treatment relative to the tensile strength (σ _h0 ) before the heat treatment of the ultra-fine copper alloy wire 1 subjected to heat treatment at a temperature of 350°C or lower and for a time of 5 seconds or less [(1-σ _h1 /σ _h0 )×100%] is set to be 2% or less.

The reason why the heat treatment conditions are set at a temperature of 350° C. or less and a time of 5 seconds or less is that in the cable manufacturing process of ultra-fine copper alloy wires and stranded wires, for example, the thermal load conditions of the insulator extrusion process are within this range. In addition, the reason why the decrease rate [(1-σ _h1 /σ _h0 )×100%] of the tensile strength (σ _h1 ) after heat treatment relative to the tensile strength (σ _h0 ) before heat treatment is 2% Hereinafter, if the reduction rate exceeds 2%, disconnection will occur in the extrusion process, resulting in a significant decrease in cable properties. Therefore, by setting the decrease in strength within the above-mentioned range, it is possible to manufacture a cable without breakage and without change in performance.

Second, the ultrafine copper alloy stranded wire will be described.

FIG. 2 shows the ultrafine copper alloy stranded wire of this embodiment.

This ultra-fine copper alloy stranded wire 3 is formed by twisting seven ultra-fine copper alloy wires 1 shown in FIG. 1 , and has a predetermined relationship between its wire diameter and resistance.

That is, this ultra-fine copper alloy stranded wire 3 is 7 Cu-Ag alloy wires, that is, the wire diameter is 0.025-0.010mm, and the silver content is 1-3% by weight, preferably the silver content is 1.5-2.5% by weight. %, the tensile strength is more than 850MPa, the electrical conductivity is more than 85% IACS, and the elongation is 0.5-3.0%. The ultra-fine copper alloy wire 1 is twisted, and its wire diameter and resistance have the following relationship.

The resistance of 7 twisted wires with a diameter of 0.025mm at 20°C is below 6000Ω/km,

The resistance of 7 twisted wires with a wire diameter of 0.023mm at 20°C is below 7000Ω/km,

The resistance of 7 twisted wires with a wire diameter of 0.020mm at 20°C is below 9500Ω/km,

The resistance of 7 twisted wires with a wire diameter of 0.018mm at 20°C is below 11500Ω/km,

The resistance of 7 twisted wires with a wire diameter of 0.016mm at 20°C is below 15000Ω/km,

The resistance of 7 twisted wires with a wire diameter of 0.013mm at 20°C is below 22000Ω/km,

The resistance of 7 twisted wires with a diameter of 0.010mm at 20°C is below 38000Ω/km,

The reason why the resistance is limited for each size is to make an ultra-fine copper alloy twisted wire 3 that truly balances both the reduction in diameter and the electrical characteristics according to the AWG standard.

Next, the ultrafine copper alloy wire and the ultrafine copper alloy stranded wire on which the plated layer is formed will be described.

Fig. 3 shows an example of plating an ultra-fine copper alloy wire.

The plated ultrafine copper alloy wire 2 is formed by forming a plating layer 6 on the outer periphery of the ultrafine copper alloy wire 1 shown in FIG. 1 . The plated layer 6 is usually formed of tin (Sn), silver (Ag) or nickel (Ni) mainly from the viewpoint of improving the corrosion resistance and solder connection of the ultra-fine copper alloy wire 1 .

In addition, as shown in FIG. 4 , seven plated ultrafine copper alloy wires 2 can also be twisted to form a plated ultrafine copper alloy twisted wire 4 .

Next, a method of manufacturing the ultrafine copper alloy wire 1 and the ultrafine copper alloy twisted wire 3 of the present embodiment will be described.

First, add 1-3 wt% silver, preferably 1.5-2.5 wt% silver, to pure copper to form a copper alloy, and then, through wire drawing or intermediate heat treatment, it is made into a very fine wire with a diameter of 0.025-0.010mm Wire. At this time, tin (Sn), silver (Ag) or nickel (Ni) plating can also be performed on the surface of the wire during processing to finally produce an ultra-fine wire with a wire diameter of 0.025-0.010mm.

Next, heat treatment is performed on the obtained single ultrafine copper alloy wire or an ultrafine copper alloy stranded wire obtained by twisting a predetermined number of, for example, seven ultrafine copper alloy wires under specific conditions. The heat treatment is performed by moving the treatment in a furnace heated to 300-500°C for 0.2-5 seconds.

The reason why the heat treatment condition is set at 300-500°C for 0.2-5 seconds is because if the heat treatment temperature is lower than 300°C and the heat treatment time is less than 0.2 seconds, the decrease in tensile strength is small, but the increase in electrical conductivity is also small. Too little to obtain the desired characteristics. In addition, if the heat treatment temperature exceeds 500°C and the heat treatment time exceeds 5 seconds, the electrical conductivity increases, but the tensile strength decreases remarkably, and the desired characteristics cannot be obtained.

Specifically, by performing heat treatment at 300-500°C and 0.2-5 seconds, the reduction rate of the tensile strength (σ _a1 ) after heat treatment relative to the tensile strength (σ _a0 ) before heat treatment can be achieved [(1-σ _a1 /σ _a0 )×100%] is 30% or less, and the increase rate of the electrical conductivity (ρ _a1 ) after heat treatment relative to the electrical conductivity (ρ _a0 ) before heat treatment [((ρ _a1 )/(ρ _a0 )-1)×100%] is 60% or more.

The ultra-fine copper alloy wire or ultra-fine copper alloy stranded wire obtained after the above treatment has a wire diameter of 0.025-0.010mm, contains 1-3% by weight of silver, preferably 1.5-2.5% by weight of silver, and has a tensile strength The strength is above 850MPa, the electrical conductivity is above 85% IACS, and the elongation is 0.5-3.0%; and, after heat treatment at a temperature below 350° and for a time below 5 seconds, the tensile strength (σ _h1 ) after heat treatment is relatively The decrease rate [(1-σ _h1 /σ _h0 )×100%] of the tensile strength (σ _h0 ) before heat treatment is 2% or less.

According to this embodiment, an ultra-fine wire with a final wire diameter of 0.025 mm or less can be obtained, and both high-strength characteristics and low-resistance characteristics (high conductivity) can be obtained at the same time, and even when using an ultra-fine wire at the same time Ultra-fine copper alloy wire and ultra-fine copper alloy stranded wire with high heat resistance are hard to lose strength even under thermal load such as extrusion manufacturing process of axial cable.

Therefore, if these ultra-fine copper alloy wires and ultra-fine copper alloy stranded wires are used to manufacture coaxial cables, etc., they can be well suited to applications that require miniaturization, thinner diameter, light weight, high bending resistance, and good transmission performance. Cables for electronic equipment and medical equipment with other performance.

Example 1

Fabrication of Cu-Ag alloy wires.

Add 2.0% by weight of silver to oxygen-free copper, elongation (%). Furthermore, as the evaluation of heat resistance, heat processing was performed at 350 degreeC for 5 second, and the intensity change of the tensile strength after that was compared. Then wire drawing is carried out until the wire diameter is 0.025-0.010 mm, and an ultra-fine copper alloy wire is obtained. Then, the obtained ultrafine copper alloy wire is heat-treated under heat treatment conditions within a prescribed range to produce an ultrafine copper alloy wire.

The tensile strength (MPa), electrical conductivity (%IACS), and elongation (%) of the produced ultrafine copper alloy wires of various sizes were measured. Furthermore, as the evaluation of heat resistance, heat processing was performed at 350 degreeC for 5 second, and the intensity change of the tensile strength after that was compared. Here, the heat resistance was evaluated by the strength decrease rate after heat treatment, and the strength decrease rate was the decrease rate of the tensile strength (σ _h1 ) after heat treatment relative to the tensile strength (σ _h0 ) before heat treatment [ (1−σ _h1 /σ _h0 )×100%]. The results are shown in Table 1.

Table 1

No. Wire diameter (mm) Ag concentration (weight%) Tensile strength (MPa) Conductivity (%IACS) Elongation (%) Heat resistance (%) Heat treatment (℃×sec) 1 0.025 2.0 952 86.2 1.3 1.3 350×5.0 2 0.025 2.0 915 88.3 1.5 1.2 450×1.5 3 0.025 2.0 910 87.2 1.4 1.1 500×0.4 4 0.023 2.0 960 86.4 1.2 1.2 350×5.0 5 0.023 2.0 920 88.1 1.0 1.1 450×1.5 6 0.023 2.0 915 87.6 1.5 1.2 500×0.4 7 0.020 2.0 954 86.0 1.2 1.0 350×5.0 8 0.020 2.0 930 87.2 1.4 0.5 450×1.5 9 0.020 2.0 925 86.5 1.3 0.6 500×0.4 10 0.018 2.0 965 87.8 1.4 1.2 350×5.0 11 0.018 2.0 925 88.1 1.5 1.0 450×1.5 12 0.018 2.0 920 87.1 1.4 1.0 500×0.4 13 0.016 2.0 962 86.8 1.3 1.2 350×5.0 14 0.016 2.0 935 87.4 1.2 1.3 450×1.5 15 0.016 2.0 923 87.2 1.4 1.3 500×0.4 16 0.013 2.0 975 86.0 1.2 1.1 350×5.0 17 0.013 2.0 950 86.3 1.0 1.2 450×1.5

No. Wire diameter (mm) Ag concentration (weight%) Tensile strength (MPa) Conductivity (%IACS) Elongation (%) Heat resistance (%) Heat treatment (℃×sec) 18 0.013 2.0 940 86.2 1.3 1.0 500×0.4 19 0.010 2.0 985 87.5 1.2 1.2 350×5.0 20 0.010 2.0 950 865 1.0 1.4 450×1.5 twenty one 0.010 2.0 936 87.1 1.3 1.2 500×0.4

Example 2

Next, the production of Cu-Ag alloy stranded wire will be described.

2.0% by weight of silver was added to oxygen-free copper, heated and melted in a graphite crucible fixed in a vacuum box, and then cast into a Φ8.0mm wire billet by continuous casting using a graphite mold. Thereafter, through wire drawing, intermediate annealing, wire drawing, and silver plating, and then further wire drawing until the wire diameter is 0.025-0.010 mm, an ultra-fine copper alloy wire is obtained. Furthermore, seven ultrafine copper alloy wires obtained for each size were twisted to obtain an ultrafine copper alloy twisted wire.

The tensile strength (MPa), electrical resistance (Ω/km), and elongation (%) of the produced ultrafine copper alloy wires of various sizes were measured. Furthermore, as the evaluation of heat resistance, heat processing was performed at 350 degreeC for 5 second, and the intensity change of the tensile strength after that was compared. Here, the heat resistance was evaluated by the rate of strength decrease after heat treatment in the same manner as in Example 1. The rate of strength decrease was the tensile strength (σ _h1 ) after heat treatment relative to the tensile strength before heat treatment (σ h1 ). _h0 ) reduction rate [(1-σ _h1 /σ _h0 )×100%]. The results are shown in Table 2.

Table 2

No. Number of wires/wire diameter (bar/mm) Ag concentration (weight%) Tensile strength (MPa) Resistance (Ω/km) Elongation (%) Heat resistance (%) Heat treatment (℃×sec) 1 7/0.025 2.0 932 5,630 2.0 1.0 350×5.0 2 7/0.025 2.0 905 5,500 2.4 1.2 450×1.5 3 7/0.025 2.0 910 5,600 2.2 1.3 500×0.4 4 7/0.023 2.0 942 6,680 2.4 1.2 350×5.0 5 7/0.023 2.0 910 6,500 2.5 1.1 450×1.5 6 7/0.023 2.0 910 6,620 2.3 1.3 500×0.4 7 7/0.020 2.0 955 8,850 2.2 1.0 350×5.0

No. Number of wires/wire diameter (bar/mm) Ag concentration (weight%) Tensile strength (MPa) Resistance (Ω/km) Elongation (%) Heat resistance (%) Heat treatment (℃×sec) 8 7/0.020 2.0 920 8,700 2.4 0.5 450×1.5 9 7/0.020 2.0 915 8,800 2.3 0.8 500×0.4 10 7/0.018 2.0 943 11,000 2.3 1.2 350×5.0 11 7/0.018 2.0 915 10,900 2.5 1.0 450×1.5 12 7/0.018 2.0 920 10,950 2.4 1.0 500×0.4 13 7/0.016 2.0 945 14,080 2.3 1.2 350×5.0 14 7/0.016 2.0 925 14,000 2.2 1.3 450×1.5 15 7/0.016 2.0 930 14,000 2.3 1.2 500×0.4 16 7/0.013 2.0 954 20,550 2.2 1.3 350×5.0 17 7/0.013 2.0 940 20,500 2.0 1.2 450×1.5 18 7/0.013 2.0 945 20,500 2.4 1.0 500×0.4 19 7/0.010 2.0 955 37,100 2.2 1.3 350×5.0 20 7/0.010 2.0 950 37,000 2.0 1.4 450×1.5 twenty one 7/0.010 2.0 945 37,080 2.3 1.2 500×0.4

Comparative example 1

Fabrication of Cu-Ag alloy wire.

Ultrafine copper alloy wires were produced with silver concentrations or heat treatment conditions outside the range specified by the present invention. Other conditions are identical with embodiment 1. The results are shown in Table 3.

(052) Table 3

No. Wire diameter (mm) Ag concentration (weight%) Tensile strength (MPa) Conductivity (%IACS) Elongation (%) Heat resistance (%) Heat treatment (℃×sec) 1 0.023 2.0 1025 83.5 1.0 5.0 none 2 0.023 0.5 750 90.5 1.5 3.5 450×1.5

No. Wire diameter (mm) Ag concentration (weight%) Tensile strength (MPa) Conductivity (%IACS) Elongation (%) Heat resistance (%) Heat treatment (℃×sec) 3 0.023 3.5 1100 82.0 1.5 1.5 450×1.5 4 0.023 2.0 1090 82.4 1.5 3.0 250×5.0 5 0.023 2.0 700 88.4 4.0 1.5 600×0.2 6 0.023 2.0 980 84.0 1.0 4.5 450×0.1 7 0.023 2.0 800 88.8 3.5 1.2 450×6.0

(054) Table 4

No. Number of wires/wire diameter (bar/mm) Ag concentration (weight%) Tensile strength (MPa) Resistance (Ω/km) Elongation (%) Heat resistance (%) Heat treatment (℃×sec) 1 7/0.023 2.0 1020 6,800 1.1 5.5 none 2 7/0.023 0.5 760 6,300 2.5 4.5 450×1.5 3 7/0.023 3.5 1150 7,100 1.7 2.5 450×1.5 4 7/0.023 2.0 1050 7,050 1.6 3.5 250×5.0 5 7/0.023 2.0 720 6,400 4.5 2.5 600×0.2 6 7/0.023 2.0 985 6,800 1.5 4.8 450×0.1 7 7/0.023 2.0 810 6,400 4.0 1.5 450×6.0

Comparative example 2

Production of Cu-Ag alloy stranded wire.

The ultra-fine copper alloy stranded wires were produced according to the silver concentration or heat treatment conditions outside the specified range of the present invention. Other conditions are identical with embodiment 2. The results are shown in Table 4.

original example 1

Cu-Sn alloy wires were fabricated.

0.3% by weight of tin was added to the oxygen-free copper, and after being heated and melted in a graphite crucible fixed in a vacuum box, a Φ8.0mm wire billet was produced by continuous casting using a graphite mold. Thereafter, through wire drawing, intermediate annealing, wire drawing, silver plating, and then wire drawing to a wire diameter of 0.023 mm, an ultrafine copper alloy wire was produced, and the same evaluation as in Example 1 was performed. Furthermore, using this material, an ultra-fine copper alloy wire was produced under the production conditions of the present invention, that is, heat treatment conditions, and the same evaluation was performed. The results are shown in Table 5.

table 5

NO wire diameter mm Sn concentration (weight%) Tensile strength (MPa) Conductivity (%IACS) Elongation (%) Heat resistance (%) Heat treatment (℃×sec) 1 0.023 0.3 800 78.0 1.0 18.0 none 2 0.023 0.3 700 82.0 1.0 4.0 450×1.5

original example 2

Production of Cu-Sn alloy stranded wire.

0.3% by weight of tin was added to the oxygen-free copper, and after being heated and melted in a graphite crucible fixed in a vacuum box, a Φ8.0mm wire billet was produced by continuous casting using a graphite mold. Thereafter, through wire drawing, intermediate annealing, wire drawing, silver plating, and then wire drawing to a wire diameter of 0.023 mm, an ultra-fine copper alloy wire was produced. Thereafter, seven polar copper alloy wires were stranded to obtain an ultrafine copper alloy stranded wire, and the same evaluation as in Example 2 was performed. Furthermore, using this material, an ultra-fine copper alloy stranded wire was produced according to the production conditions of the present invention, that is, the heat treatment conditions, and the same evaluation was performed. The results are shown in Table 6.

Table 6

NO Number of wires/wire diameter (bar/mm) Sn concentration (weight%) Tensile strength×(MPa) Resistance (Ω/km) Elongation (%) Heat resistance (%) Heat treatment (℃×sec) 1 7/0.023 0.3 780 7500 1.1 17.5 none 2 7/0.023 0.3 710 7100 2.5 4.5 450×1.5

The evaluation of the above results is as follows:

As shown in Table 1, the ultra-fine copper alloy wire of Example 1 has high strength and high electrical conductivity with a tensile strength of 850 MPa or more and an electrical conductivity of 85% IACS in various sizes. The characteristics of Example 1 have obvious advantages. In addition, it shows that even if the original Cu-Sn alloy wire is subjected to the same heat treatment as in Example 1 (No. 2 in Table 5), although its electrical conductivity is improved, its tensile strength is greatly reduced, and it is difficult to achieve both. two characteristics.

As shown in Table 2, compared with the characteristics of the original Example 2 shown in Table 6, the ultra-fine copper alloy stranded wire of Example 2 is most suitable for use as a fine copper alloy stranded wire due to its high tensile strength and low resistance. Coaxial cable for the purpose of diameter reduction. In addition, it can be known that even if the existing Cu-Sn alloy stranded wire is treated in the same way as in Example 2 (No. 2 in Table 6), although the resistance becomes smaller, the tensile strength is greatly reduced, and it is difficult to achieve Take into account the characteristics of both aspects.

In addition, the heat resistance of the twisted wire of Example 2 is about 1.0% in strength reduction rate, and it is very stable against heat; compared with this, the heat resistance of the twisted wire of Conventional Example 2 (NO .1) is 17.5%, and its strength is significantly reduced. Furthermore, even when the same heat treatment as in Example 2 (No. 2 in Table 6) was performed, the strength decrease rate was as large as 4.5%. In order to evaluate these differences in heat resistance, extrusion of an insulator was carried out using the ultrafine copper alloy stranded wires of Example 2 (No. 5 in Table 2) and conventional example 2 (No. 1, 2 in Table 6). test. As a result, the ultrafine copper alloy stranded wire of embodiment 2 (NO.5 in table 2) can be extruded smoothly, while the ultrafine copper alloy stranded wire of original example 2 (NO.1, 2 in table 6) The joint line is broken during the extrusion process. Therefore, the ultrafine copper alloy stranded wire of Example 2 is significantly superior in heat resistance to the ultrafine copper alloy stranded wire of Conventional Example 2.

Table 3 shows the evaluation results of ultra-fine copper alloy wires produced under conditions outside the range specified in the present invention. Since No. 1 was not subjected to heat treatment, its tensile strength was high but its electrical conductivity was low, and the strength decrease rate indicating heat resistance was as large as 5%. The added concentration of silver in NO.2 and 3 is outside the range. If the silver concentration is too low, the conductivity is high and the strength is low. If the silver concentration is too high, the strength is high and the conductivity is low. Although the heat treatment time of NO.4 and 5 is within the range, but because the heat treatment temperature is out of the range, it is difficult to balance both strength and electrical conductivity. Although the heat treatment temperatures of NO.6 and 7 are within the range of conditions, but because the heat treatment time is outside the range, it is also difficult to balance the performance of both strength and electrical conductivity.

Table 4 shows the evaluation results of ultra-fine copper alloy stranded wires produced under conditions outside the range specified in the present invention. Since No. 1 was not heat-treated, its tensile strength was high, but its electrical resistance was also high, and the strength decrease rate indicating heat resistance was as large as 5.5%. The added concentration of silver in NO.2 and 3 is out of the range. If the silver concentration is too low, the resistance is low and the strength is also low. If the silver concentration is too high, the strength is high and the resistance is also high. Although the heat treatment time of NO.4 and 5 is within the range, but because the heat treatment temperature is out of the range, it is difficult to balance both strength and electrical conductivity. Although the heat treatment temperatures of NO.6 and 7 are within the range of conditions, but because the heat treatment time is outside the range, it is also difficult to balance the performance of both strength and electrical conductivity.

Next, other embodiments will be described. As an additive element of the copper alloy of the present invention, one or two metals selected from magnesium (Mg) and indium (In) may be added in a total amount of 0.02-0.10% by weight in addition to silver. Adding additional elements will increase the cost accordingly, but further improvement in strength can be expected.

Thirdly, the ultra-fine insulated wire will be described.

FIG. 5 shows a cross-sectional view of the ultrafine insulated wire of this embodiment.

This ultra-fine insulated wire 10 is formed by twisting seven ultra-fine copper alloy wires 1 to form an inner conductor, and then covering the outer periphery of the inner conductor with a solid insulator 5a.

The manufacturing method of the ultra-fine insulated wire of the present invention is that adding 1-3% by weight of silver to pure copper to form a copper alloy, and drawing a wire to make an ultra-fine copper alloy wire with a wire diameter of 0.010-0.025 mm, The above-mentioned ultra-fine copper alloy wires are twisted to form an ultra-fine copper alloy stranded wire, and after heat treatment at a temperature of 300-500°C for 0.2-5 seconds, the outer circumference of the above-mentioned copper alloy stranded wire is coated with a thickness of It is made of solid insulator below 0.07mm.

As the ultra-fine copper alloy wire, the ultra-fine copper alloy wire or the plated ultra-fine copper alloy wire described in the first part of this specific embodiment is used. The ultra-fine copper alloy stranded wire 3 is the ultra-fine copper alloy stranded wire described in the second part of this specific embodiment.

In addition, the ultra-fine copper alloy stranded wire 3 is heat-treated, and the resistance reduction rate after the heat treatment is 6% or more, and the tensile strength reduction rate after the heat treatment is within 20%. If the reduction rate of resistance after heat treatment is less than 6%, and the reduction rate of tensile strength after the above-mentioned heat treatment exceeds 20%, disconnection is likely to occur during extrusion manufacturing operations or soldering operations at the end portions, and it is difficult to achieve high Both strength characteristics and low resistance characteristics (high conductivity).

In addition, the electrical resistance of the copper alloy litz wire 3 and the wire diameter of the ultrafine copper alloy wire 1 have the following relationship.

(1) When the wire diameter of the ultra-fine copper alloy wire 1 is more than 0.021 mm and less than 0.025 mm, the electric resistance is 7200 Ω/km or less.

(2) When the wire diameter of the ultra-fine copper alloy wire 1 is more than 0.018 mm and less than 0.022 mm, the electric resistance is 9500 Ω/km or less.

(3) When the wire diameter of the ultra-fine copper alloy wire 1 is more than 0.016 mm and less than 0.020 mm, the electric resistance is 12200 Ω/km or less.

(4) When the wire diameter of the ultra-fine copper alloy wire 1 is more than 0.014 mm and less than 0.018 mm, the electric resistance is 14700 Ω/km or less.

(5) When the wire diameter of the ultra-fine copper alloy wire 1 is more than 0.013 mm and less than 0.017 mm, the electric resistance is 16500 Ω/km or less.

(6) When the wire diameter of the ultra-fine copper alloy wire 1 is more than 0.011 mm and less than 0.015 mm, the electrical resistance is 22500 Ω/km or less.

(7) When the wire diameter of the ultra-fine copper alloy wire 1 is more than 0.010 mm and less than 0.012 mm, the electric resistance is 38000 Ω/km or less.

The resistance of ultra-fine copper alloy wires for each size is limited in order to ensure the reduction in diameter and electrical characteristics at the same time as the AWG standard.

A solid insulator 5 a having a thickness of 0.07 mm or less is formed on the outer periphery of the ultrafine copper alloy stranded wire 3 . The reason why the thickness is set at 0.07mm or less is that the electrostatic capacitance is 100pF/m or more according to the standard of 43AWG-50AWG coaxial cable.

As the solid insulator 5a, for example, tetrafluoroethylene·full root bark propyl vinyl ether (PFA) copolymer (PFA), tetrafluoroethylene·hexafluoropropylene copolymer (FEP) etc. can be used. A resin selected from materials with a dielectric constant of 2.1 and a melting point of around 300°C.

Fourth, explain the coaxial cable.

FIG. 6 is a cross-sectional view showing a coaxial cable 20A according to this embodiment.

This coaxial cable 20A is formed by winding a plurality of conductor wires 13 in a spiral shape along the length direction of the ultrafine insulated wire 10 on the outer periphery of the ultrafine insulated wire 10 shown in FIG. The surface of 15 is coated with protective layer 17 and forms.

The coaxial cable 20A is manufactured by adding 1-3% by weight of silver to pure copper to form a copper alloy, and drawing a wire to make an ultra-fine copper alloy wire with a wire diameter of 0.010-0.025mm, and then connecting a plurality of the above poles Fine copper alloy wires are stranded to form ultra-fine copper alloy stranded wires. After heat treatment at a temperature of 300-500°C for 0.2-5 seconds, the outer circumference of the above-mentioned copper alloy stranded wires is coated with a thickness of 0.07mm. The following solid insulator is used to form an ultra-fine insulated wire, and then on the outer periphery of the above-mentioned ultra-fine insulated wire, a plurality of conductor wires are wound in a spiral shape along the length direction of the above-mentioned ultra-fine insulated wire to form an outer conductor, and then in the above-mentioned The surface of the outer conductor is covered with a protective layer.

A plurality of (for example, 30 to 60) conductor wires 13 such as Sn-plated copper wires, Sn-plated copper alloy wires, silver-plated copper wires, and silver-plated copper alloy wires are horizontally wound in a spiral shape at a predetermined pitch to form an external conductor 15 (spiral shield).

The protective layer 17 can be coated with tetrafluoroethylene-full root bark propyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), ethylene-tetrafluoroethylene copolymer (ETFE), etc. to set.

The electrostatic capacitance, attenuation, and life of the coaxial cable 20A bent at 90 degrees left and right have the following relationship with the wire diameter of the ultrafine copper alloy wire 1 .

① When the diameter of the ultra-fine copper alloy wire 1 is greater than 0.021mm but less than 0.025mm, its electrostatic capacitance is 100-130pF/m, the attenuation is 0.6-1.0dB/m (frequency is 10MHz), and it is bent 90 degrees left and right The service life of the product is more than 20,000 times under the conditions of bending radius R=2mm and load=50g.

② When the diameter of the ultra-fine copper alloy wire 1 is greater than 0.018mm but less than 0.022mm, its electrostatic capacitance is 100-130pF/m, the attenuation is 0.8-1.2dB/m (frequency is 10MHz), and it is bent 90 degrees left and right The service life of the product is more than 20,000 times under the conditions of bending radius R=2mm and load=50g.

③ When the diameter of the ultra-fine copper alloy wire 1 is greater than 0.016mm but less than 0.020mm, its electrostatic capacitance is 100-130pF/m, the attenuation is 1.0-1.5dB/m (frequency is 10MHz), and it is bent 90 degrees left and right The service life of the product is more than 20,000 times under the conditions of bending radius R=2mm and load=50g.

④ When the diameter of the ultra-fine copper alloy wire 1 is greater than 0.014mm but less than 0.018mm, its electrostatic capacitance is 100-130pF/m, the attenuation is 1.1-1.6dB/m (frequency is 10MHz), and it is bent 90 degrees left and right The service life of the product is more than 30,000 times under the conditions of bending radius R=2mm and load=50g.

⑤ When the diameter of the ultra-fine copper alloy wire 1 is greater than 0.013mm but less than 0.017mm, its electrostatic capacitance is 100-130pF/m, the attenuation is 1.3-1.8dB/m (frequency is 10MHz), and it is bent 90 degrees left and right The service life of the product is more than 30,000 times under the conditions of bending radius R=2mm and load=20g.

⑥ When the diameter of the ultra-fine copper alloy wire 1 is greater than 0.011mm but less than 0.015mm, its electrostatic capacitance is 100-130pF/m, the attenuation is 1.7-2.4dB/m (frequency is 10MHz), and it is bent 90 degrees left and right The service life of the product is more than 30,000 times under the conditions of bending radius R=2mm and load=20g.

⑦When the diameter of the ultra-fine copper alloy wire 1 is greater than 0.010mm but less than 0.012mm, its electrostatic capacitance is 100-130pF/m, the attenuation is 2.5-3.8dB/m (frequency is 10MHz), and it is bent 90 degrees left and right The service life of the product is more than 10,000 times under the conditions of bending radius R=2mm and load=20g.

The purpose of limiting the capacitance, attenuation, and 90-degree left and right bending life of ultra-fine copper alloy wires for each size is to ensure both electrical and mechanical characteristics of the thinner wire in accordance with the AWG standard.

FIG. 7 is a cross-sectional view showing another coaxial cable 20B of this embodiment.

This coaxial cable 20B is formed by covering the outer periphery of a copper alloy stranded wire (inner conductor) 3 formed by twisting seven ultra-fine copper alloys 1 with a foam insulator 5b, and then forming an outer periphery of a skin layer 11 on the outer periphery thereof. A plurality of conductor wires 13 are wound in a helical shape along the longitudinal direction of the copper alloy litz wire (inner conductor) 3 to form an outer conductor 15 , and the surface of the outer conductor 15 is coated with a protective layer 17 .

The manufacturing method of the coaxial cable 20B is to add 1-3% by weight of silver to pure copper to form a copper alloy, and then wire-drawing to make an ultra-fine copper alloy wire with a wire diameter of 0.010-0.025 mm, and then connect a plurality of the above poles Thin copper alloy wires are twisted to form ultra-fine copper alloy stranded wires. After heat treatment at a temperature of 300-500°C for 0.2-5 seconds, the outer circumference of the above-mentioned copper alloy stranded wires is coated with a thickness of 0.28mm. After the following foam insulator is formed, a skin layer is formed, and then on the outer periphery of the skin layer, a plurality of conductor wires are wound into a helical shape along the length direction of the above-mentioned copper alloy stranded wire to form an outer conductor, and then on the outer conductor of the above-mentioned outer conductor The surface is covered with a protective layer.

The ultrafine copper alloy wire 1 or plated ultrafine copper alloy wire 2 used in the coaxial cable 20B of this embodiment is the same as that of the coaxial cable 20A described above, and thus detailed description thereof will be omitted.

The inner conductor used in the coaxial cable 20B of this embodiment and the inner conductor of the extra-fine insulated wire used in the above-mentioned coaxial cable 20A, that is, the extra-fine copper alloy stranded wire 3 has the same electrical resistance as the ultra-fine copper alloy wire 1. Except for the following relationships, the rest are the same.

① When the wire diameter of the ultra-fine copper alloy wire 1 is more than 0.021 mm and less than 0.025 mm, the resistance is less than 7500/km.

② When the wire diameter of the ultra-fine copper alloy wire 1 is more than 0.018 mm and less than 0.022 mm, the electrical resistance is 10000 Ω/km or less.

③ When the wire diameter of the ultra-fine copper alloy wire 1 is more than 0.016 mm and less than 0.020 mm, the electrical resistance is 13000 Ω/km or less.

④ When the wire diameter of the ultra-fine copper alloy wire 1 is more than 0.014 mm and less than 0.018 mm, the electrical resistance is 15500 Ω/km or less.

⑤ When the wire diameter of the ultra-fine copper alloy wire 1 is more than 0.013 mm and less than 0.017 mm, the resistance is 17000 Ω/km or less.

(6) When the wire diameter of the ultra-fine copper alloy wire 1 is more than 0.011 mm and less than 0.015 mm, the electrical resistance is 23500 Ω/km or less.

⑦ When the wire diameter of the ultra-fine copper alloy wire 1 is more than 0.010 mm and less than 0.012 mm, the resistance is 40000 Ω/km or less.

As the foam insulator 5b, for example, foamed tetrafluoroethylene-pervasal propyl vinyl ether copolymer (PFA) for extrusion can be used. A foam insulator 5 b having a thickness of 0.28 mm or less is formed on the outer periphery of the ultrafine copper alloy stranded wire 3 . The reason why the thickness is 0.28mm or less is to make the electrostatic capacitance more than 30pF/m according to the coaxial cable standard of 43AWG-50AWG.

As the skin layer 11, it can be coated with tetrafluoroethylene·full root skin propyl vinyl ether copolymer (PFA), tetrafluoroethylene·hexafluoropropylene copolymer (FEP), ethylene·tetrafluoroethylene by winding PET tape or extrusion coating. Ethylene copolymer (ETFE) for setting.

A plurality of (for example, 30 to 60) conductor wires 13 such as Sn-plated copper wires, Sn-plated copper alloy wires, silver-plated copper wires, and silver-plated copper alloy wires are horizontally wound in a spiral shape at a predetermined pitch to form an external conductor 15 (spiral shield).

The protective layer 17 can be coated with tetrafluoroethylene-full root bark propyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), ethylene-tetrafluoroethylene copolymer by winding PET tape or extrusion coating substance (ETFE) for setting.

The electrostatic capacitance of the coaxial cable 20B is greater than 0.021 mm and less than 0.025 mm, greater than 0.018 mm and less than 0.022 mm, and greater than 0.016 mm and less than 0.020 mm, when the diameter of the ultra-fine copper alloy wire 1 is greater than 0.021 mm. When it is larger than 0.014mm but below 0.018mm, when it is larger than 0.013mm and below 0.017mm, when it is larger than 0.011mm and below 0.015mm, when it is larger than 0.010mm and below 0.012mm, it is 30-80pF/m , and its capacitance is very low.

Next, specific examples of manufacturing the coaxial cables 20A and 20B are listed.

Example 3

Manufacture of 43AWG coaxial cables.

2.0% by weight of silver was added to oxygen-free copper, and after heating and melting in a graphite crucible fixed in a vacuum box, a graphite mold was used to continuously cast to produce a Φ8mm wire billet. Thereafter, through wire drawing, intermediate annealing, wire drawing, and Ag plating on the final wire to make the coating thickness reach 1 μm, and then wire drawing to obtain a wire diameter of 0.023 mm to obtain an ultra-fine copper alloy wire. Seven such 0.023 mm Ag-plated copper alloy wires (Cu-2%Ag) were prepared and twisted at a pitch of 1.1 mm to produce a twisted wire with an outer diameter of 0.069 mm. Then, the obtained twisted wires were subjected to five types of moving heat treatments in a heat treatment furnace heated at 350° C. to obtain ultrafine copper alloy twisted wires.

The tensile strength and electrical resistance before and after heat treatment of this ultrafine copper alloy stranded wire, and the electrical conductivity after heat treatment were measured, and the rate of change in tensile strength and electrical resistance was calculated. In addition, the rate of change was calculated by the formula of [(value before heat treatment−value after heat treatment)/heat before heat treatment]×100%. The results are shown in Table 7.

Furthermore, the outer periphery of this litz wire was extruded and coated with PFA resin with a thickness of 0.053 mm to form a solid inner insulator with an outer diameter of 0.175 mm. Then, a Cu-In-Sn alloy wire (containing 0.19% by weight of Sn and 0.20% by weight of In) is wound laterally on the outer periphery of the inner insulator to form an outer conductor, and then wrapped on the outer periphery of the outer conductor. A protective layer made of PFA resin with a thickness of 0.03 mm was applied to obtain a coaxial cable 20A with an outer diameter of 0.285 mm.

Alternatively, foamed PFA resin with a thickness of 0.07 mm was extruded and coated on the outer periphery of such a stranded wire to form an inner insulator having air cells with an outer diameter of 0.210 mm. Form the epidermis that 0.01mm thick is made of PET tape on the outer periphery of this internal insulator again, and then the Cu-In-Sn alloy wire (containing the Sn of 0.19% by weight) that wire rod diameter is 0.025mm laterally winds on the outer periphery of this epidermis and 0.20% by weight of In) to form an outer conductor, and a protective layer made of a PET tape with a thickness of 0.015 mm was formed on the outer periphery of the outer conductor to obtain a coaxial cable 20B with an outer diameter of 0.310 mm.

Example 4

43AWG coaxial cable production.

The same treatment as in the manufacturing method of Example 1 was performed except that heat treatment was performed at 450° C. for 1.5 seconds.

Example 5

43AWG coaxial cable production.

The same treatment as the manufacturing method of Example 1 was performed except that the heat treatment was performed at 500° C. for 0.4 seconds.

Example 6

44AWG coaxial cable production.

2.0% by weight of silver was added to oxygen-free copper, and after heating and melting in a graphite crucible fixed in a vacuum box, a graphite mold was used to continuously cast to produce a Φ8mm wire billet. Afterwards, wire drawing, intermediate annealing, wire drawing, and Ag plating on the final wire rod to make the coating thickness reach 0.9 μm, and then wire drawing to reach a wire diameter of 0.020 mm to obtain an ultra-fine copper alloy wire. Seven such 0.020 mm Ag-plated copper alloy wires (Cu-2%Ag) were prepared and twisted at a pitch of 1.0 mm to produce a twisted wire with an outer diameter of 0.06 mm. Then, the obtained twisted wires were subjected to five types of moving heat treatments in a heat treatment furnace heated at 350° C. to obtain ultrafine copper alloy twisted wires.

For this ultrafine copper alloy stranded wire, in the same manner as in Example 3, the tensile strength and electrical resistance before and after heat treatment, and the electrical conductivity after heat treatment were measured, and the rate of change in tensile strength and electrical resistance was calculated. In addition, the rate of change was calculated by the formula of [(value before heat treatment−value after heat treatment)/heat before heat treatment]×100%. The results are shown in Table 7.

Furthermore, the outer periphery of this litz wire was extruded and coated with PFA resin with a thickness of 0.048 mm to form a solid inner insulator with an outer diameter of 0.156 mm. Then, a Cu-In-Sn alloy wire (containing 0.19% by weight of Sn and 0.20% by weight of In) is laterally wound on the outer periphery of the inner insulator to form an outer conductor, and then wrapped on the outer periphery of the outer conductor. A protective layer made of PFA resin with a thickness of 0.03 mm was applied to obtain a coaxial cable 20A with an outer diameter of 0.256 mm.

Alternatively, foamed PFA grease with a thickness of 0.06 mm is extruded and coated on the outer periphery of the stranded wire to form an internal insulator with air bubbles with an outer diameter of 0.180 mm. Form the epidermis that 0.01mm thick is made of PET tape on the outer periphery of this internal insulator again, and then the Cu-In-Sn alloy wire (containing the Sn of 0.19% by weight) that wire rod diameter is 0.025mm laterally winds on the outer periphery of this epidermis and 0.20% by weight of In) to form an outer conductor, and a protective layer made of PET tape with a thickness of 0.015 mm was formed on the outer periphery of the outer conductor to obtain a coaxial cable 20B with an outer diameter of 0.280 mm.

Example 7

44AWG coaxial cable production.

The same treatment as in the manufacturing method of Example 6 was performed except that heat treatment was performed at 450° C. for 1.5 seconds.

Example 8

44AWG coaxial cable production.

The same treatment as the manufacturing method of Example 6 was performed except that heat treatment was performed at 500° C. for 0.4 seconds.

Example 9

45AWG coaxial cable production.

2.0% by weight of silver was added to oxygen-free copper, and after heating and melting in a graphite crucible fixed in a vacuum box, a graphite mold was used to continuously cast to produce a Φ8mm wire billet. Afterwards, wire drawing, intermediate annealing, wire drawing, and Ag plating on the final wire rod to make the coating thickness reach 0.8 μm, and then wire drawing processing to reach a wire diameter of 0.018 mm to obtain an ultra-fine copper alloy wire. Seven such 0.018 mm Ag-plated copper alloy wires (Cu-2%Ag) were prepared and twisted at a pitch of 0.8 mm to produce a twisted wire with an outer diameter of 0.054 mm. Then, the obtained twisted wires were subjected to five types of moving heat treatments in a heat treatment furnace heated at 350° C. to obtain ultrafine copper alloy twisted wires.

For this ultrafine copper alloy stranded wire, in the same manner as in Example 3, the tensile strength and electrical resistance before and after heat treatment, and the electrical conductivity after heat treatment were measured, and the rate of change in tensile strength and electrical resistance was calculated. In addition, the rate of change was calculated by the formula of [(value before heat treatment−value after heat treatment)/heat before heat treatment]×100%. The results are shown in Table 7.

Furthermore, the outer periphery of this litz wire was extruded and coated with PFA resin with a thickness of 0.038 mm to form a solid inner insulator with an outer diameter of 0.130 mm. Then, a Cu-In-Sn alloy wire (containing 0.19% by weight of Sn and 0.20% by weight of In) is laterally wound on the outer periphery of the inner insulator to form an outer conductor, and then wrapped on the outer periphery of the outer conductor. A protective layer made of PFA resin with a thickness of 0.025 mm was applied to obtain a coaxial cable 20A with an outer diameter of 0.22 mm.

Alternatively, foamed PFA grease with a thickness of 0.05 mm is extruded and coated on the outer periphery of the stranded wire to form an internal insulator with air bubbles with an outer diameter of 0.154 mm. Form the epidermis that 0.01mm thick is made of PET tape on the outer periphery of this inner insulator again, and then the Cu-In-Sn alloy wire (containing the Sn of 0.19% by weight) that wire rod diameter is 0.020mm laterally winds on the outer periphery of this epidermis and 0.20% by weight of In) to form an outer conductor, and a protective layer made of a PET tape with a thickness of 0.015 mm was formed on the outer periphery of the outer conductor to obtain a coaxial cable 20B with an outer diameter of 0.244 mm.

Example 10

45AWG coaxial cable production.

The same treatment as in the manufacturing method of Example 9 was performed except that heat treatment was performed at 450° C. for 1.5 seconds.

Example 11

45AWG coaxial cable production.

The same treatment as in the manufacturing method of Example 9 was performed except that heat treatment was performed at 500° C. for 0.4 seconds.

Example 12

46AWG coaxial cable production.

2.0% by weight of silver was added to oxygen-free copper, and after heating and melting in a graphite crucible fixed in a vacuum box, a graphite mold was used to continuously cast to produce a Φ8mm wire billet. Thereafter, through wire drawing, intermediate annealing, wire drawing, and Ag plating on the final wire to make the coating thickness reach 0.7 μm, and then wire drawing to obtain a wire diameter of 0.016 mm to obtain an ultra-fine copper alloy wire. Seven such 0.016 mm Ag-plated copper alloy wires (Cu-2%Ag) were prepared and twisted at a pitch of 0.8 mm to produce a twisted wire with an outer diameter of 0.048 mm. Then, the obtained twisted wires were subjected to five types of moving heat treatments in a heat treatment furnace heated at 350° C. to obtain ultrafine copper alloy twisted wires.

For this ultrafine copper alloy stranded wire, in the same manner as in Example 3, the tensile strength and electrical resistance before and after heat treatment, and the electrical conductivity after heat treatment were measured, and the rate of change in tensile strength and electrical resistance was calculated. In addition, the rate of change was calculated by the formula of [(value before heat treatment−value after heat treatment)/heat before heat treatment]×100%. The results are shown in Table 7.

Furthermore, the outer periphery of this litz wire was extruded and coated with PFA resin with a thickness of 0.033 mm to form a solid inner insulator with an outer diameter of 0.114 mm. Then, a Cu-In-Sn alloy wire (containing 0.19% by weight of Sn and 0.20% by weight of In) is laterally wound on the outer periphery of the inner insulator to form an outer conductor, and then wrapped on the outer periphery of the outer conductor. A protective layer made of PFA resin with a thickness of 0.025 mm was applied to obtain a coaxial cable 20A with an outer diameter of 0.204 mm.

Or, extrude and coat foamed PFA resin with a thickness of 0.04 mm on the outer periphery of the twisted wire to form an internal insulator with air bubbles with an outer diameter of 0.128 mm. Form the epidermis that 0.01mm thick is made of PET tape on the outer periphery of this inner insulator again, and then the Cu-In-Sn alloy wire (containing the Sn of 0.19% by weight) that wire rod diameter is 0.020mm laterally winds on the outer periphery of this epidermis and 0.20% by weight of In) to form an outer conductor, and a protective layer made of a PET tape with a thickness of 0.015 mm was formed on the outer periphery of the outer conductor to obtain a coaxial cable 20B with an outer diameter of 0.218 mm.

Example 13

46AWG coaxial cable production.

The same treatment as in the manufacturing method of Example 12 was performed except that heat treatment was performed at 450° C. for 1.5 seconds.

Example 14

46AWG coaxial cable production.

The same treatment as in the manufacturing method of Example 12 was performed except that the heat treatment was performed at 500° C. for 0.4 seconds.

Example 15

47AWG coaxial cable production.

2.0% by weight of silver was added to oxygen-free copper, and after heating and melting in a graphite crucible fixed in a vacuum box, a graphite mold was used to continuously cast to produce a Φ8mm wire billet. Thereafter, through wire drawing, intermediate annealing, wire drawing, and Ag plating on the final wire to make the coating thickness reach 0.6 μm, and then wire drawing to reach a wire diameter of 0.015 mm to obtain an ultra-fine copper alloy wire. Seven such 0.015 mm Ag-plated copper alloy wires (Cu-2%Ag) were prepared and twisted at a pitch of 0.8 mm to produce a twisted wire with an outer diameter of 0.045 mm. Then, the obtained twisted wires were subjected to five types of moving heat treatments in a heat treatment furnace heated at 350° C. to obtain ultrafine copper alloy twisted wires.

For this ultrafine copper alloy stranded wire, in the same manner as in Example 3, the tensile strength and electrical resistance before and after heat treatment, and the electrical conductivity after heat treatment were measured, and the rate of change in tensile strength and electrical resistance was calculated. In addition, the rate of change was calculated by the formula of [(value before heat treatment−value after heat treatment)/heat before heat treatment]×100%. The results are shown in Table 7.

Furthermore, the outer periphery of this litz wire was extruded and coated with PFA resin with a thickness of 0.030 mm to form a solid inner insulator with an outer diameter of 0.105 mm. Then, a Cu-In-Sn alloy wire (containing 0.19% by weight of Sn and 0.20% by weight of In) is laterally wound on the outer periphery of the inner insulator to form an outer conductor, and then wrapped on the outer periphery of the outer conductor. A protective layer made of PFA resin with a thickness of 0.020 mm was applied to obtain a coaxial cable 20A with an outer diameter of 0.185 mm.

Or, extrude and coat foamed PFA resin with a thickness of 0.035 mm on the outer periphery of the twisted wire to form an internal insulator with air bubbles with an outer diameter of 0.115 mm. Form the epidermis that 0.01mm thick is made of PET tape on the outer periphery of this inner insulator again, and then the Cu-In-Sn alloy wire (containing the Sn of 0.19% by weight) that wire rod diameter is 0.020mm laterally winds on the outer periphery of this epidermis and 0.20% by weight of In) to form an outer conductor, and a protective layer made of PET tape with a thickness of 0.015 mm was formed on the outer periphery of the outer conductor to obtain a coaxial cable 20B with an outer diameter of 0.205 mm.

Example 16

47AWG coaxial cable production.

The same treatment as in the manufacturing method of Example 15 was performed except that heat treatment was performed at 450° C. for 1.5 seconds.

Example 17

47AWG coaxial cable production.

The same treatment as in the manufacturing method of Example 15 was performed except that heat treatment was performed at 500° C. for 0.4 seconds.

Example 18

48AWG coaxial cable production.

2.0% by weight of silver was added to oxygen-free copper, and after heating and melting in a graphite crucible fixed in a vacuum box, a graphite mold was used to continuously cast to produce a Φ8mm wire billet. Thereafter, through wire drawing, intermediate annealing, wire drawing, and Ag plating on the final wire to make the coating thickness reach 0.5 μm, and then wire drawing to reach a wire diameter of 0.013 mm to obtain an ultra-fine copper alloy wire. Seven such 0.013 mm Ag-plated copper alloy wires (Cu-2%Ag) were prepared and twisted at a pitch of 0.7 mm to produce a twisted wire with an outer diameter of 0.039 mm. Then, the obtained twisted wires were subjected to five types of moving heat treatments in a heat treatment furnace heated at 350° C. to obtain ultrafine copper alloy twisted wires.

For this ultrafine copper alloy stranded wire, in the same manner as in Example 3, the tensile strength and electrical resistance before and after heat treatment, and the electrical conductivity after heat treatment were measured, and the rate of change in tensile strength and electrical resistance was calculated. In addition, the rate of change was calculated by the formula of [(value before heat treatment−value after heat treatment)/heat before heat treatment]×100%. The results are shown in Table 7.

Furthermore, the outer periphery of this litz wire was extruded and coated with PFA resin with a thickness of 0.030 mm to form a solid inner insulator with an outer diameter of 0.105 mm. Then, a Cu-In-Sn alloy wire (containing 0.19% by weight of Sn and 0.20% by weight of In) is laterally wound on the outer periphery of the inner insulator to form an outer conductor, and then wrapped on the outer periphery of the outer conductor. A protective layer made of PFA resin with a thickness of 0.020 mm was applied to obtain a coaxial cable 20A with an outer diameter of 0.185 mm.

Alternatively, foamed PFA grease with a thickness of 0.03 mm is extruded and coated on the outer periphery of the twisted wire to form an internal insulator with air bubbles with an outer diameter of 0.099 mm. Form the epidermis that 0.01mm thick is made of PET tape on the outer periphery of this inner insulator again, and then the Cu-In-Sn alloy wire (containing the Sn of 0.19% by weight) that wire rod diameter is 0.016mm laterally winds on the outer periphery of this epidermis and 0.20% by weight of In) to form an outer conductor, and a protective layer made of PET tape with a thickness of 0.015 mm was formed on the outer periphery of the outer conductor to obtain a coaxial cable 20B with an outer diameter of 0.181 mm.

Example 19

48AWG coaxial cable production.

The same treatment as in the manufacturing method of Example 18 was performed except that heat treatment was performed at 450° C. for 1.5 seconds.

Example 20

48AWG coaxial cable production.

The same treatment as in the manufacturing method of Example 18 was performed except that heat treatment was performed at 500° C. for 0.4 seconds.

Example 21

50AWG coaxial cable production.

2.0% by weight of silver was added to oxygen-free copper, and after heating and melting in a graphite crucible fixed in a vacuum box, a graphite mold was used to continuously cast to produce a Φ8mm wire billet. Thereafter, through wire drawing, intermediate annealing, wire drawing, and Ag plating on the final wire to make the coating thickness reach 0.4 μm, and then wire drawing to obtain a wire diameter of 0.010 mm to obtain an ultra-fine copper alloy wire. Seven such Ag-plated copper alloy wires (Cu-2%Ag) of 0.010 mm in diameter were prepared and twisted at a pitch of 0.5 mm to produce a twisted wire with an outer diameter of 0.030 mm. Then, the obtained twisted wires were subjected to five types of moving heat treatments in a heat treatment furnace heated at 350° C. to obtain ultrafine copper alloy twisted wires.

For this ultrafine copper alloy stranded wire, in the same manner as in Example 3, the tensile strength and electrical resistance before and after heat treatment, and the electrical conductivity after heat treatment were measured, and the rate of change in tensile strength and electrical resistance was calculated. In addition, the rate of change was calculated by the formula of [(value before heat treatment−value after heat treatment)/heat before heat treatment]×100%. The results are shown in Table 7.

Furthermore, the outer periphery of this litz wire was extruded and coated with PFA resin with a thickness of 0.020 mm to form a solid inner insulator with an outer diameter of 0.07 mm. Then, a Cu-In-Sn alloy wire (containing 0.19% by weight of Sn and 0.20% by weight of In) is laterally wound on the outer periphery of the inner insulator to form an outer conductor, and then wrapped on the outer periphery of the outer conductor. A protective layer made of PFA resin with a thickness of 0.015 mm was applied to obtain a coaxial cable 20A with an outer diameter of 0.126 mm.

Or, extrude and coat foamed PFA resin with a thickness of 0.025 mm on the periphery of the twisted wire to form an internal insulator with air bubbles with an outer diameter of 0.08 mm. Form the epidermis that 0.01mm thick is made of PET tape on the outer periphery of this inner insulator again, and then the Cu-In-Sn alloy wire (containing the Sn of 0.19% by weight) that wire rod diameter is 0.016mm laterally winds on the outer periphery of this epidermis and 0.20% by weight of In) to form an outer conductor, and a protective layer made of a PET tape with a thickness of 0.015 mm was formed on the outer periphery of the outer conductor to obtain a coaxial cable 20B with an outer diameter of 0.162 mm.

Example 22

50AWG coaxial cable production.

The same treatment as in the manufacturing method of Example 21 was performed except that heat treatment was performed at 450° C. for 1.5 seconds.

Example 23

50AWG coaxial cable production.

The same treatment as in the manufacturing method of Example 21 was performed except that heat treatment was performed at 500° C. for 0.4 seconds.

Comparative example 3

43AWG coaxial cable production.

The same treatment as the manufacturing method of Example 3 was performed except that the heat treatment was not performed.

Comparative example 4

43AWG coaxial cable production.

The same process as the manufacturing method of Example 4 was performed except that the added concentration of silver was 0.5% by weight.

Comparative Example 5

43AWG coaxial cable production.

The same process as the manufacturing method of Example 4 was performed except that the added concentration of silver was 3.5% by weight.

Comparative example 6

43AWG coaxial cable production.

The same treatment as the manufacturing method of Example 3 was performed except that the heat treatment was performed at 250° C. for 5.0 seconds.

Comparative Example 7

43AWG coaxial cable production.

The same treatment as the manufacturing method of Example 3 was performed except that the heat treatment was performed at 600° C. for 0.2 seconds.

Comparative Example 8

43AWG coaxial cable production.

The same treatment as the manufacturing method of Example 3 was performed except that the heat treatment was performed at 450° C. for 0.1 second.

Comparative Example 9

43AWG coaxial cable production.

The same treatment as the manufacturing method of Example 3 was performed except that the heat treatment was performed at 450° C. for 6.0 seconds.

original example 3

43AWG coaxial cable production.

The same treatment as in the manufacturing method of Example 3 was performed except that the additive metal was replaced with 0.3% by weight of Sn from Ag and no heat treatment was performed.

original example 4

43AWG coaxial cable production.

The same process as in the manufacturing method of Example 3 was performed except that the additive metal was replaced with 0.3% by weight of Sn from Ag.

original example 5

43AWG coaxial cable production.

The same process as the manufacturing method of Example 4 was performed except that the additive metal was replaced with 0.3% by weight of Sn from Ag.

original example 6

43AWG coaxial cable production.

The same process as that of Example 5 was performed except that the additive metal was replaced with 0.3% by weight of Sn from Ag.

Comparative Example 10

42AWG coaxial cable production.

0.19% by weight of Sn and 0.20% by weight of In were added to oxygen-free copper, heated and melted in a graphite crucible fixed in a vacuum box, and then continuously cast into a Φ8mm wire billet using a graphite mold. Afterwards, wire drawing, intermediate annealing, wire drawing, and Ag plating on the final wire rod to make the coating thickness reach 1.1 μm, and then wire drawing to reach a wire diameter of 0.025 mm to obtain an ultra-fine copper alloy wire. Prepare seven such 0.025mm Ag-plated Cu-In-Sn copper alloy wires (0.19% by weight of Sn, 0.20% by weight of In), twist them with a pitch of 1.3mm, and make their outer diameter 0.075mm. mm stranded wire. Then, the obtained twisted wires were subjected to five types of moving heat treatments in a heat treatment furnace heated at 350° C. to obtain ultrafine copper alloy twisted wires.

For this ultrafine copper alloy stranded wire, in the same manner as in Example 3, the tensile strength and electrical resistance before and after heat treatment, and the electrical conductivity after heat treatment were measured, and the rate of change in tensile strength and electrical resistance was calculated. The results are shown in Table 7.

Furthermore, the outer periphery of this litz wire was extruded and coated with PFA resin with a thickness of 0.006 mm to form a solid inner insulator with an outer diameter of 0.195 mm. Then, a Cu-In-Sn alloy wire (containing 0.19% by weight of Sn and 0.19% by weight of In) is laterally wound on the outer periphery of the inner insulator to form an outer conductor, and then wrapped on the outer periphery of the outer conductor. A protective layer made of PFA resin with a thickness of 0.003 mm was applied to obtain a coaxial cable 20A with an outer diameter of 0.305 mm.

Or, extrude and coat foamed PFA resin with a thickness of 0.08mm on the periphery of the twisted wire to form an internal insulator with air bubbles with an outer diameter of 0.235mm. Form the epidermis that 0.01mm thick is made of PET tape on the outer periphery of this internal insulator again, and then the Cu-In-Sn alloy wire (containing the Sn of 0.19% by weight) that wire rod diameter is 0.025mm laterally winds on the outer periphery of this epidermis and 0.20% by weight of In) to form an outer conductor, and a protective layer made of PET tape with a thickness of 0.015 mm was formed on the outer periphery of the outer conductor to obtain a coaxial cable 20B with an outer diameter of 0.335 mm.

Comparative Example 11

42AWG coaxial cable production.

The same treatment as the production method of Comparative Example 10 was performed except that heat treatment was performed at 450° C. for 1.5 seconds.

Comparative Example 12

42AWG coaxial cable production.

The same treatment as the production method of Comparative Example 10 was performed except that heat treatment was performed at 500° C. for 0.4 seconds.

Comparative Example 13

44AWG coaxial cable production.

Except for adding 0.19 weight% of Sn and 0.19 weight% of In instead of silver, the same process as the manufacturing method of Example 6 was performed.

Comparative Example 14

44AWG coaxial cable production.

The same process as the production method of Comparative Example 13 was performed except that heat treatment was performed at 450° C. for 1.5 seconds.

Comparative Example 15

44AWG coaxial cable production.

The same treatment as the production method of Comparative Example 13 was performed except that the heat treatment was performed at 500° C. for 0.4 seconds.

Comparative Example 16

46AWG coaxial cable production.

Except for adding 0.19 weight% of Sn and 0.19 weight% of In instead of silver, the same process as the manufacturing method of Example 12 was performed.

Comparative Example 17

46AWG coaxial cable production.

The same treatment as the production method of Comparative Example 16 was performed except that heat treatment was performed at 450° C. for 1.5 seconds.

Comparative Example 18

46AWG coaxial cable production.

The same treatment as the production method of Comparative Example 16 was performed except that heat treatment was performed at 500° C. for 0.4 seconds.

Comparative Example 19

48AWG coaxial cable production.

Except for adding 0.19 weight% of Sn and 0.19 weight% of In instead of silver, the same process as the manufacturing method of Example 18 was performed.

Comparative Example 20

48AWG coaxial cable production.

The same process as the production method of Comparative Example 19 was performed except that heat treatment was performed at 450° C. for 1.5 seconds.

Comparative Example 21

48AWG coaxial cable production.

The same treatment as the production method of Comparative Example 19 was performed except that heat treatment was performed at 500° C. for 0.4 seconds.

Comparative Example 22

50AWG coaxial cable production.

The same process as the manufacturing method of Example 21 was performed except that 0.19% by weight of Sn and 0.19% by weight of In were added instead of silver.

Comparative Example 23

50AWG coaxial cable production.

The same treatment as the production method of Comparative Example 22 was performed except that heat treatment was performed at 450° C. for 1.5 seconds.

Comparative Example 24

50AWG coaxial cable production.

The same treatment as the production method of Comparative Example 22 was performed except that heat treatment was performed at 500° C. for 0.4 seconds.

Next, evaluation results of ultrafine copper alloy stranded wires of Examples 3-23, Comparative Examples 3-24, and Conventional Examples 3-6 will be described.

What table 7 shows is the tensile strength and resistance before and after heat treatment, conductivity, tensile Strength, and rate of change of tensile strength and resistance.

Table 7

[Table 7] (Data based on twisted wires of 7 wires)

*Change rate=[(value before heat treatment-value after heat treatment)/value before heat treatment]×100%

As shown in Table 1, for the twisted wires of 7 wires of Example 3-5 (43AWG), since the added metal concentration and heat treatment conditions are appropriate, the reduction rate of tensile strength is up to 6.9-10.8%, The tensile strength after heating was 910 MPa, exceeding the target tensile strength of 850 MPa. In addition, the decrease rate of resistance is also remarkably large to 6.1-7.3% (resistance change rate of 6% or more), the resistance after heating is 6450Ω/km, and a highly conductive wire with a conductivity of 85% or more can be obtained.

Correspondingly, the twisted wire of 7 wires of the original example 3-6 (43AWG) of the copper-tin alloy has a tensile strength lower than 850MPa, and then, even if the original copper-tin alloy wire is also subjected to the method of the present invention Heat treatment (existing example 3-6), its tensile strength also reduces significantly to 710-730MPa, and the reduction rate of electric resistance is no more than 0.9%, it is difficult to reach simultaneously high tensile strength and high electrical conductivity two aspects. characteristic.

The tensile strength of the 7-wire twisted wire of the conventional Cu-Sn-In alloy wire (see Comparative Examples 10-24) was lower than 850 MPa after heating, and a high-strength material could not be obtained.

In addition, since Comparative Example 3 was not subjected to heat treatment, although its tensile strength was high, its electrical resistance was as high as 6870Ω/km, and a highly conductive material with a conductivity of 85% or more could not be obtained.

Comparative example 4 is too low because the added concentration of silver is 0.5% by weight, therefore, its tensile strength is lower than the 850MPa of target value, and the reduction rate of resistance is the highest 2%, thus it can be seen that it is difficult to achieve high resistance and high resistance simultaneously. The characteristics of both tensile strength and low resistance.

In Comparative Example 5, since the added concentration of silver is too high at 3.5% by weight, the resistance decrease rate is only 1% at the highest, so it can be seen that it is difficult to achieve both high tensile strength and low resistance.

In Comparative Example 6, since the heat treatment temperature was as low as 250° C., the resistance reduction rate was as high as 0.5%, which shows that it is difficult to achieve both high tensile strength and low resistance.

In Comparative Example 7, since the heat treatment temperature was as high as 600°C, the reduction rate of its tensile strength was significantly as high as 27.3%. It can be seen that it is difficult to achieve both high tensile strength and low electrical resistance.

In Comparative Example 8, since the heat treatment time was as short as 0.1 second, the resistance reduction rate was the highest at 1%, which shows that it is difficult to achieve both high tensile strength and low resistance.

Comparative Example 9 is as long as 6 seconds due to the heat treatment time, thus its tensile strength reduction rate is 22.1%, and the tensile strength is as low as 810MPa. It can be seen that it is difficult to achieve the high tensile strength and low resistance simultaneously. characteristic.

Comparing Examples 3-23 and Comparative Examples 10-24, the twisted wires of Comparative Examples 10-24 have the highest resistance reduction rate of about 0.8-3.2%, and they are all wires with higher resistance values. As for Comparative Example 10-Comparative Example 24, the tensile strength was still lower than the target value of 850 MPa.

That is, as can be seen from Table 7, in the case of using the Cu-0.19%Sn-0.19%In alloy as in Comparative Example 10-24, the tensile strength was lower than that of Example 3-23 regardless of whether heat treatment was performed, And its resistance is also all higher than embodiment 3-23.

In addition, as explained in the prior art, the original product uses Cu-0.19%Sn-0.19%In alloy stranded wire without special heat treatment without additional heat treatment. Therefore, even if the 7-strand wire has high conductivity and high strength characteristics in the bare wire stage, due to the heating generated during the extrusion operation (for example, 400-300 ° C for 1 second to 5 seconds), as in Comparative Examples 10-24 As shown in the alloy stranded wire, its resistance reduction rate is also small, but its tensile strength is lower than that before heating.

On the contrary, since the twisted wire of the embodiment is heat-treated in advance after the twisted wire is processed, it is not affected by the thermal history caused by the heating generated during the extrusion processing, and the other parts before and after the extrusion processing are not affected. A coaxial cable that does not vary in both tensile strength and electrical resistance.

According to the result of table 7, the electrical characteristic of the coaxial cable of embodiment is identical with the thicker original coaxial electric shaft of wire size (for example, the electrical characteristic and the mechanical characteristic of the coaxial cable of 43AWG, 45AWG, 47AWG of embodiment The same electrical and mechanical characteristics as the original 42AWG, 44AWG, 46AWG coaxial cables). Therefore, by using odd-numbered coaxial cables such as 43AWG, 45AWG, and 47AWG, it is possible to reduce the diameter of the coaxial cable and prevent a sharp deterioration in the electrical characteristics of the coaxial cable.

Next, evaluation results of the coaxial cables of Examples 3-23 and Conventional Examples 3-6 will be described.

First, bending tests were performed on various coaxial cables of Examples 3-23, Comparative Examples 3-24, and Conventional Examples 3-6, and the bending life was evaluated. In the bending test, one end of the sample cable (coaxial cable) is fixed on a jig with a bending radius of 2 mm, and a weight of 50 gf or 20 gf is hung on the other end of the sample cable according to the size of the sample cable. Under the condition that the test speed is 30 times/min, the sample is repeatedly bent at 90° left and right in the length direction of the coaxial cable, and the number of times (life) until the internal conductor of the sample cable breaks is measured; during the test A voltage of several V was always applied to the sample, and the time when the current value decreased by 20% compared with the start of the test was taken as the life time. The numerical values in Table 8 and Table 9 indicate the number of times of bending up to the lifetime.

In addition, the capacitance, attenuation, and characteristic impedance of various coaxial cables of Examples 3-23, Comparative Examples 3-24, and Conventional Examples 3-6 were also evaluated.

For the measurement of electrostatic capacitance, the space between the inner conductor and the outer conductor of a 1-m sample cable (coaxial cable) was connected to an LCR meter, and the electrostatic capacitance at 1 KHz was measured. Also, between the inner conductor and outer conductor at both ends of a 1-m sample cable was connected to the transmitting end and receiving end of the network analyzer with a coaxial cable (lead wire) for measurement, and the attenuation at 10 MHz was measured. In addition, before measuring the attenuation of the sample, calibration is performed so as to exclude the influence of the coaxial cable (lead wire) for measurement. In addition, the characteristic impedance is a value measured at 10 MHz using a network analyzer.

Tables 8 and 9 show the evaluation results of these electrical and mechanical properties.

Table 8 and Table 9 are as follows:

＊The brackets indicate the bending life before heating

＊The brackets indicate the bending life before heating

As shown in Table 8, the bending life of the coaxial cable 20A of Example 3-5 (43AWG) is 40900 times or more, and the bending life of Comparative Example 3-9 (43AWG) and Conventional Example 3-6 (43AWG) 37600 times, 22300 times, 38200 times, 36600 times, 31400 times, 36800 times, 35300 times, 26500 times, 19400 times, 21800 times, 20400 times Long life and exhibits excellent bending characteristics. In addition, comparing Examples 6-23 and Comparative Examples 13-24 with the same wire size, it can be seen that the coaxial cables of the Examples have a longer bending life and better bending characteristics than the coaxial cables of the Comparative Examples.

As shown in Table 9, the bending life of the coaxial cable 20B of Example 3-5 (43AWG) is 20900 times or more, and the bending life of Comparative Example 3-9 (43AWG) and Conventional Example 3-6 (43AWG) 19600 times, 12300 times, 18200 times, 20600 times, 12400 times, 18800 times, 9300 times, 16500 times, 12400 times, 11900 times, 12300 times Long life and exhibits excellent bending characteristics.

In addition, comparing Examples 6-23 and Comparative Examples 13-24 with the same wire size, it can be seen that the coaxial cables of the Examples have a longer bending life and better bending characteristics than the coaxial cables of the Comparative Examples.

In addition, from the results of Tables 8 and 9, it was confirmed that the coaxial cables of Examples 3-23 maintained the same electrostatic capacitance and characteristic impedance as compared with the coaxial cables of Comparative Examples and Conventional Examples. As for the attenuation at a frequency of 10 MHz, it was also confirmed that the coaxial cable of the example maintained an attenuation characteristic equal to or higher than that of the coaxial cables of the conventional example and the comparative example with the same wire size.

In particular, although Comparative Example 8 is a 42 AWG coaxial cable, when comparing the bending life and attenuation with the coaxial cable of Example 3-5, it can be evaluated that the bending life of Example 3-5 is better than that of Example 3-5. long and roughly equal in terms of attenuation.

In addition, referring to Table 7, when comparing the tensile strength and electrical resistance of the twisted wire state, it can be evaluated that Examples 3-5 are superior in tensile strength and approximately equivalent in electrical resistance.

That is to say, according to the present embodiment, even if the coaxial cable is made with a thinner wire size according to the customer's request, its electrical characteristics (center conductor resistance, attenuation) are the same as those of the comparative example with a thicker wire size, and it is possible to A coaxial cable in which the bending characteristics (tensile strength) of the coaxial rod is higher than that of the comparative example in which the wire rod size is thicker is provided. Therefore, when reducing the size of the coaxial cable, deterioration of electrical characteristics (resistance, attenuation) and mechanical characteristics (bending life) can be suppressed as much as possible.

other embodiments

As an additive element of the copper alloy of the present invention, in addition to silver, one or two metals selected from magnesium (Mg) and indium (In) may be added in a total amount of 0.02-0.10% by weight. Although the cost increases with the addition of elements, it can be expected to further improve the strength.

Fifth, the multi-core cable will be explained.

First, a multi-core cable using four coaxial cables will be described.

Fig. 8 is a cross-sectional view of a multi-core cable according to an embodiment of the present invention.

In this multi-core cable 30, four coaxial cables 20A shown in FIG. 6 or four coaxial cables 20B shown in FIG. The binding tape 33 is wound, and the shielding layer 35 and the outer shell layer 37 are provided on its outer periphery.

The roll thickness of the binding tape 33 is, for example, 0.05 mm. In addition, as the shielding layer 35 , for example, a braided wire having a thickness of 0.05 mm and braided Sn-plated annealed copper wire is used. Shielding layer 35 may also use other cross-wound shielding layers. The shell layer 37 can be wrapped with PET tape, or extrusion-coated with tetrafluoroethylene-full root bark propyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), ethylene-tetrafluoroethylene Copolymer (ETFE), polyvinyl chloride (PVC), etc. to set.

In addition, although the coaxial cables 20A or 20B shown in FIG. 8 are arranged in one layer on concentric circles and twisted, more coaxial cables 20A or 20B may be arranged in two or more layers and twisted. combine.

Second, it illustrates the use of three coaxial cables and a multicore cable with very fine insulated wires.

Fig. 9 is a cross-sectional view of a multi-core cable according to another embodiment of the present invention.

This multi-core cable 40 is three coaxial cables 20A shown in FIG. 6 or coaxial cables 20B shown in FIG. 7 and ultra-fine insulated wires shown in FIG. 10 is a composite cable that is arranged on concentric circles, twisted, wound with a binding band 33, and further provided with a shielding layer 35 and a sheath layer 37 on its outer periphery.

9 uses three coaxial cables 20A or 20B and one extra-fine insulated wire 10, but the ratio of the coaxial cable 20A or 20B to the extra-fine insulated wire 10 can be changed arbitrarily as needed. In addition, although FIG. 9 shows a structure in which coaxial cables 20A or 20B and extra-fine insulated wires 10 are arranged in one layer on concentric circles and twisted, it is also possible to use more coaxial cables 20A or 20B and The extra-fine insulated wires 10 are arranged in a structure in which two or more layers are twisted.

Next, a multi-core cable using four extra-fine insulated wires will be described.

Fig. 10 is a cross-sectional view of a multi-core cable according to yet another embodiment.

This kind of multi-core cable 50 is arranged on the outer periphery of the tension member 31 (or between the core wires) four extra-fine insulated wires 10 shown in FIG. A cable for differential transmission made of a shielding layer 35 and an outer shell layer 37 is provided on the outer side thereof.

In addition, although Fig. 10 shows a structure in which one layer of extra-fine insulated wires 10 is twisted on concentric circles, it is also possible to use a structure in which more extra-fine insulated wires 10 are arranged to be twisted in two or more layers. .

Next, a multi-core cable using four sets of coaxial cable units will be described.

Fig. 11 is a cross-sectional view of a multi-core cable according to yet another embodiment.

This multi-core cable 60 is a coaxial cable unit 61 formed by bundling a plurality of coaxial cables 20A shown in FIG. 6 or coaxial cables 20B shown in FIG. A plurality of sets of such coaxial cable units 61 are converged and twisted on the outer periphery of the cable, and then the binding tape 33 is wound, and furthermore, a shielding layer 35 and an outer shell layer 37 are provided on the outside thereof.

Next, a helical multi-core cable will be described.

Fig. 12 is a side view of a multi-core cable according to another embodiment.

This multi-core cable 70 is to prepare two extra-fine insulated wires 10 as shown in FIG. As the central conductor 71, for example, a silver-plated copper wire having a wire diameter of 0.16 mm can be used. In addition, instead of winding two extra-fine insulated wires 10 , two extra-fine insulated wires 10 may be twisted first, and then one or two such twisted wires may be wound at a certain pitch.

Next, the ribbon cable type multi-core cable will be described.

Fig. 13 is a cross-sectional view of a multi-core cable according to another embodiment.

Such a multi-core cable 80 is produced by arranging a plurality of coaxial cables 20A shown in FIG. 6 or coaxial cables 20B shown in FIG. into a multi-core ribbon cable.

Claims (41)

1. superfine copper alloy wire, its characteristic is:

It is that line directly is 0.010-0.025mm, by the silver that contains 1-3 weight % (Ag), all the other superfine copper alloy wires for copper (Cu) and unavoidable impurities formation, its tensile strength is more than the 850MPa, and conductance is more than 85%IACS, and elongation is 0.5-3.0%; And, through the heat treated of temperature below 350 ℃, below 5 seconds of time, the tensile strength sigma after the heat treated _H1With respect to the tensile strength sigma before the heat treated _H0Reduced rate (1-σ _H1/ σ _H0) * 100% is below 2%.

2. superfine copper alloy wire according to claim 1, its characteristic is:

Form the coating of tin (Sn), silver (Ag) or nickel (Ni) on the surface of above-mentioned alloy wire.

3. superfine copper alloy twisted wire is characterized in that:

With many claims 1 or 2 described superfine copper alloy wire is stranded forms.

4. superfine copper alloy twisted wire according to claim 3 is characterized in that:

Being that 7 lines directly are the stranded twisted wire that forms of above-mentioned superfine copper alloy wire of 0.025mm, is 6000 Ω/below the km at 20 ℃ resistance.

5. superfine copper alloy twisted wire according to claim 3 is characterized in that:

Being that 7 lines directly are the stranded twisted wire that forms of above-mentioned superfine copper alloy wire of 0.023mm, is 7000 Ω/below the km at 20 ℃ resistance.

6. superfine copper alloy twisted wire according to claim 3 is characterized in that:

Being that 7 lines directly are the stranded twisted wire that forms of above-mentioned superfine copper alloy wire of 0.020mm, is 9500 Ω/below the km at 20 ℃ resistance.

7. superfine copper alloy twisted wire according to claim 3 is characterized in that:

Being that 7 lines directly are the stranded twisted wire that forms of above-mentioned superfine copper alloy wire of 0.018mm, is 11500 Ω/below the km at 20 ℃ resistance.

8. superfine copper alloy twisted wire according to claim 3 is characterized in that:

Being that 7 lines directly are the stranded twisted wire that forms of above-mentioned superfine copper alloy wire of 0.016mm, is 15000 Ω/below the km at 20 ℃ resistance.

9. superfine copper alloy twisted wire according to claim 3 is characterized in that:

Being that 7 lines directly are the stranded twisted wire that forms of above-mentioned superfine copper alloy wire of 0.013mm, is 22000 Ω/below the km at 20 ℃ resistance.

10. superfine copper alloy twisted wire according to claim 3 is characterized in that:

Being that 7 lines directly are the stranded twisted wire that forms of above-mentioned superfine copper alloy wire of 0.010mm, is 38000 Ω/below the km at 20 ℃ resistance.

11. a superfine insulated wire is characterized in that:

It is directly to carry out the stranded superfine copper alloy twisted wire that forms for many superfine copper alloy wires of 0.010-0.025mm by the silver that contains 1-3 weight % (Ag), all the other lines for copper (Cu) and unavoidable impurities formation, the tensile strength of above-mentioned superfine copper alloy twisted wire is more than the 850MPa, conductance is more than 85%IACS, and to have coated thickness in the periphery of above-mentioned copper alloy twisted wire be solid insulator below the 0.07mm; Above-mentioned superfine copper alloy twisted wire is a copper alloy twisted wire after heat treatment, and the resistance reduced rate after the above-mentioned heat treatment is more than 6%, and the tensile strength reduced rate after the above-mentioned heat treatment is below 20%.

12. superfine insulated wire according to claim 11 is characterized in that:

Formed the coating of tin (Sn), silver (Ag) or nickel (Ni) on the surface of above-mentioned copper alloy wire.

13. a coaxial cable is characterized in that:

Form length direction along above-mentioned superfine insulated wire with the helically wound external conductor of many strip conductors coil of wire in the periphery of claim 11 or 12 described superfine insulated wires, coated protective layer in the said external surface of conductors again.

14. coaxial cable according to claim 13 is characterized in that:

Constitute above-mentioned superfine insulated wire copper alloy wire line footpath for greater than 0.021mm below 0.025mm, its resistance is 7200 Ω/below the km, electrostatic capacitance is 100-130pF/m, attenuation was 0.6-1.0db/m when signal frequency was 10MHz, and the life-span of 90 degree that bend right and left is being more than 20000 times under the condition of radius of curvature R=2mm, load=50g.

15. coaxial cable according to claim 13 is characterized in that:

Constitute above-mentioned superfine insulated wire copper alloy wire line footpath for greater than 0.018mm below 0.022mm, its resistance is 9500 Ω/below the km, electrostatic capacitance is 100-130pF/m, attenuation was 0.8-1.2db/m when signal frequency was 10MHz, and the life-span of 90 degree that bend right and left is being more than 20000 times under the condition of radius of curvature R=2mm, load=50g.

16. coaxial cable according to claim 13 is characterized in that:

Constitute above-mentioned superfine insulated wire copper alloy wire line footpath for greater than 0.016mm below 0.020mm, its resistance is 12200 Ω/below the km, electrostatic capacitance is 100-130pF/m, attenuation was 1.0-1.5db/m when signal frequency was 10MHz, and the life-span of 90 degree that bend right and left is being more than 20000 times under the condition of radius of curvature R=2mm, load=50g.

17. coaxial cable according to claim 13 is characterized in that:

Constitute above-mentioned superfine insulated wire copper alloy wire line footpath for greater than 0.014mm below 0.018mm, its resistance is 14700 Ω/below the km, electrostatic capacitance is 100-130pF/m, attenuation was 1.1-1.6db/m when signal frequency was 10MHz, and the life-span of 90 degree that bend right and left is being more than 30000 times under the condition of radius of curvature R=2mm, load=50g.

18. coaxial cable according to claim 13 is characterized in that:

Constitute above-mentioned superfine insulated wire copper alloy wire line footpath for greater than 0.013mm below 0.017mm, its resistance is 16500 Ω/below the km, electrostatic capacitance is 100-130pF/m, attenuation was 1.3-1.8db/m when signal frequency was 10MHz, and the life-span of 90 degree that bend right and left is being more than 30000 times under the condition of radius of curvature R=2mm, load=20g.

19. coaxial cable according to claim 13 is characterized in that:

Constitute above-mentioned superfine insulated wire copper alloy wire line footpath for greater than 0.011mm below 0.015mm, its resistance is 22500 Ω/below the km, electrostatic capacitance is 100-130pF/m, attenuation was 1.7-2.4db/m when signal frequency was 10MHz, and the life-span of 90 degree that bend right and left is being more than 30000 times under the condition of radius of curvature R=2mm, load=20g.

20. coaxial cable according to claim 13 is characterized in that:

Constitute above-mentioned superfine insulated wire copper alloy wire line footpath for greater than 0.010mm below 0.012mm, its resistance is 38000 Ω/below the km, electrostatic capacitance is 100-130pF/m, attenuation was 2.5-3.8db/m when signal frequency was 10MHz, and the life-span of 90 degree that bend right and left is being more than 10000 times under the condition of radius of curvature R=2mm, load=20g.

21. a coaxial cable is characterized in that:

The periphery of any one described superfine copper alloy twisted wire in aforesaid right requirement 3-10; coat the cellular insulation body; form length direction along above-mentioned superfine copper alloy twisted wire with the helically wound external conductor of many strip conductors coil of wire in the periphery of above-mentioned cellular insulation body again, coated protective layer in the said external surface of conductors again.

22. coaxial cable according to claim 21 is characterized in that:

Above-mentioned superfine copper alloy twisted wire is a twisted wire after heat treatment, and the resistance reduced rate after the above-mentioned heat treatment is more than 6%, and the tensile strength reduced rate after the above-mentioned heat treatment is below 20%.

23. coaxial cable according to claim 21 is characterized in that:

Formed the coating of tin (Sn), silver (Ag) or nickel (Ni) on the surface of above-mentioned copper alloy wire.

24. coaxial cable according to claim 21 is characterized in that:

The line of above-mentioned superfine copper alloy wire footpath for greater than 0.021mm below 0.025mm, its resistance is that 7500 Ω/below the km, electrostatic capacitance is 30-80pF/m.

25. coaxial cable according to claim 21 is characterized in that:

The line of above-mentioned superfine copper alloy wire footpath for greater than 0.018mm below 0.022mm, its resistance is that 10000 Ω/below the km, electrostatic capacitance is 30-80pF/m.

26. coaxial cable according to claim 21 is characterized in that:

The line of above-mentioned superfine copper alloy wire footpath for greater than 0.016mm below 0.020mm, its resistance is that 13000 Ω/below the km, electrostatic capacitance is 30-80pF/m.

27. coaxial cable according to claim 21 is characterized in that:

The line of above-mentioned superfine copper alloy wire footpath for greater than 0.014mm below 0.018mm, its resistance is that 15500 Ω/below the km, electrostatic capacitance is 30-80pF/m.

28. coaxial cable according to claim 21 is characterized in that:

The line of above-mentioned superfine copper alloy wire footpath for greater than 0.013mm below 0.017mm, its resistance is that 17000 Ω/below the km, electrostatic capacitance is 30-80pF/m.

29. coaxial cable according to claim 21 is characterized in that:

The line of above-mentioned superfine copper alloy wire footpath for greater than 0.011mm below 0.015mm, its resistance is that 23500 Ω/below the km, electrostatic capacitance is 30-80pF/m.

30. coaxial cable according to claim 21 is characterized in that:

The line of above-mentioned superfine copper alloy wire footpath for greater than 0.010mm below 0.012mm, its resistance is that 40000 Ω/below the km, electrostatic capacitance is 30-80pF/m.

31. a multicore cable is characterized in that:

At tension member or be situated between in the periphery of heart yearn, stranded many claims 13 or 21 described coaxial cables form.

32. a multicore cable is characterized in that:

At tension member or be situated between, many aforesaid rights are required 13 coaxial cable and claim 11 or stranded the forming of 12 described superfine insulated wires in the periphery of heart yearn.

33. a multicore cable is characterized in that:

At tension member or be situated between in the periphery of heart yearn, will many stranded the forming of aforesaid rights requirement 11 or 12 described superfine insulated wires.

34. a multicore cable is characterized in that:

At tension member or be situated between in the periphery of heart yearn, a plurality of stranded the forming in coaxial cable unit that require 13 or 21 described coaxial cable harnesses to form many aforesaid rights.

35. a multicore cable is characterized in that:

Requiring 11 or 12 described superfine insulated wires spacing at certain intervals to be wound on the center conductor many aforesaid rights forms.

36. a multicore cable is characterized in that:

Requiring 13 or 21 described coaxial cables to dispose side by side with a determining deviation many aforesaid rights forms.

37. the manufacture method of a superfine copper alloy wire is characterized in that:

The silver that adds 1-3 weight % in fine copper generates copper alloy, carry out wire drawing and be processed into line directly for behind the superfine copper alloy wire of 0.010-0.025mm, by under 300-500 ℃ temperature, carrying out the 0.2-5 heat treatment of second, making it become tensile strength is more than the 850MPa, conductance is more than 85%IACS, and elongation is 0.5-3.0%; And, through the heat treated of temperature below 350 ℃, below 5 seconds of time, the tensile strength sigma after the heat treated _H1With respect to the tensile strength sigma before the heat treated _H0Reduced rate (1-σ _H1/ σ _H0) * 100% is at the superfine copper alloy wire below 2%.

38. the manufacture method according to the described superfine copper alloy wire of claim 37 is characterized in that:

Also have making above-mentioned line, form the operation of the coating of tin (Sn), silver (Ag) or nickel (Ni) again on the surface of this superfine copper alloy wire directly for behind the superfine copper alloy wire of 0.010-0.025mm.

39. the manufacture method of a superfine copper alloy twisted wire is characterized in that:

The silver that adds 1-3 weight % in fine copper generates copper alloy, carry out wire drawing and be processed into line directly for behind the superfine copper alloy wire of 0.010-0.025mm, form superfine copper alloy twisted wire with many above-mentioned superfine copper alloy wires are stranded, by under 300-500 ℃ temperature, carrying out the 0.2-5 heat treatment of second, thereby make any one described superfine copper alloy twisted wire among the aforesaid right requirement 4-10.

40. the manufacture method of a superfine insulated wire is characterized in that:

The silver that adds 1-3 weight % in fine copper generates copper alloy, carry out wire drawing and be processed into line directly for behind the superfine copper alloy wire of 0.010-0.025mm, form superfine copper alloy twisted wire with many above-mentioned superfine copper alloy wires are stranded, by after carrying out the 0.2-5 heat treatment of second under 300-500 ℃ the temperature, coating thickness in the periphery of above-mentioned copper alloy twisted wire again is that solid insulator below the 0.07mm forms.

41. the manufacture method of a coaxial cable is characterized in that:

The silver that adds 1-3 weight % in fine copper generates copper alloy; carry out wire drawing and be processed into line directly for behind the superfine copper alloy wire of 0.010-0.025mm; form superfine copper alloy twisted wire with many above-mentioned superfine copper alloy wires are stranded; by after carrying out the 0.2-5 heat treatment of second under 300-500 ℃ the temperature; coating thickness in the periphery of above-mentioned copper alloy twisted wire again is that solid insulator below the 0.07mm becomes superfine insulated wire; again in the periphery of above-mentioned superfine insulated wire; length direction along above-mentioned superfine insulated wire after having formed external conductor, coats many strip conductors coil of wire coiled protective layer in the said external surface of conductors again and forms.

42. the manufacture method of a coaxial cable is characterized in that:

The silver that adds 1-3 weight % in fine copper generates copper alloy; carry out wire drawing and be processed into line directly for behind the superfine copper alloy wire of 0.010-0.025mm; form superfine copper alloy twisted wire with many above-mentioned superfine copper alloy wires are stranded; by after carrying out the 0.2-5 heat treatment of second under 300-500 ℃ the temperature; again in the periphery of above-mentioned copper alloy twisted wire after to coat thickness be cellular insulation body below the 0.28mm; form epidermal area; again in the periphery of this epidermal area; length direction along above-mentioned copper alloy twisted wire after forming external conductor, coats many strip conductors coil of wire coiled protective layer in the said external surface of conductors again and forms.

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