WO2019239655A1 - Copper alloy powder, layered/molded product, method for producing layered/molded product, and metal parts - Google Patents

Abstract

This copper alloy powder contains 0.010-1.50% of Cr and 0.010-1.40% of Zr in terms of mass%, with the remainder comprising copper and unavoidable impurities. This layered/molded product is formed by melting and solidifying a copper alloy powder that contains 0.010-1.50% of Cr and 0.010-1.40% of Zr in terms of mass%, with the remainder comprising copper and unavoidable impurities. The layered/molded product has an apparent density of 94-100% and an electrical conductivity of 50% IACS or more, and enables production of a layered/molded product having high strength, high electrical conductivity and excellent heat resistance.

Description

Copper alloy powder, additive manufacturing, additive manufacturing method and various metal parts

The present invention relates to a copper alloy powder, a layered object, a method of manufacturing a layered object, and various metal parts, and in particular, rapid solidification by performing layered modeling using a copper alloy powder containing chromium and zirconium as a raw material powder. By utilizing the phenomenon, it is possible to produce a chromium-zirconium copper alloy as a layered object having all of high strength, high conductivity, and excellent heat resistance.

Metal materials that are required to have high strength, high conductivity, and excellent heat resistance, such as electrode materials used for resistance welding and electric discharge machining, include copper alloys containing chromium and zirconium. Can be mentioned. Zirconium contained in such a copper alloy can exhibit the most excellent heat resistance effect in a solid solution state, but is maintained in a temperature range where zirconium is precipitated in the actual manufacturing process. In many cases, zirconium does not dissolve in the copper base material, but forms precipitates, and the precipitates become coarser, and the heat resistance tends to decrease. Since chromium-containing copper alloys (Cu—Cr alloys) and chromium-zirconium-containing copper alloys (Cu—Cr—Zr alloys) are age-hardening copper alloys having relatively high strength and electrical conductivity, It is applied to small parts such as welding electrode materials and spring materials, and large parts such as water-cooled molds. (For example, see Non-Patent Document 1)

In addition, chromium-zirconium copper alloy (Cu-Cr-Zr alloy) in which zirconium is added to chromium-containing copper alloy (Cu-Cr alloy) has improved intermediate temperature brittleness observed in all copper alloys, and is annealed more than chromium copper. It is known that the softening temperature is high and the strength is also high. (For example, see Non-Patent Document 1)

In a chromium-containing copper alloy (Cu-Cr alloy), non-working material has a large age hardening, and the working material tends to soften by recovery with aging at around 300 ° C, reaching maximum hardness at about 400 ° C, and at higher temperatures. There is a tendency to soften rapidly. (For example, see Non-Patent Document 2)

Conventional Cu—Cr alloys and Cu—Cr—Zr alloys are generally melted by die casting, so that the cooling rate at the time of casting cannot be increased, and the crystal grains constituting the solidified structure become coarse. In addition, zirconium may not be present in a solid solution state in the copper base material, but may be locally present as a precipitate, resulting in non-uniform product quality, and stable mechanical properties may not be obtained. is there.

Conventionally, processing methods such as casting, extrusion, cutting, and powder metallurgy have been used as methods for producing metal products from metals and alloys.

As a processing technique for metal products, the additive manufacturing method for metal powders has attracted attention. The advantage of this method is that it is possible to create complex shapes that were impossible by cutting. So far, there have been reported production examples of layered objects using iron-based alloy powder, aluminum alloy powder, titanium alloy powder and the like. However, at present, the types of metal that can be used are limited, and applicable metal products have certain limitations. (For example, see Patent Document 1)

By using the additive manufacturing method, it is possible to produce complex shaped products that cannot be manufactured by conventional methods, and it is also possible to produce products that require tailor-made by designing on the software. In addition, by irradiating laser or electron beam to a predetermined position of the powder layer composed of powder, after melting the metal / alloy, it is rapidly cooled and solidified at a high cooling rate that cannot be achieved with ordinary bulk. This makes it possible to develop materials and products with new characteristics.

However, since copper has a low light absorption rate with respect to laser, it is difficult to set modeling conditions compared to iron-based alloy powder, aluminum alloy powder, etc., and the density as a layered model after modeling is low. Since it is low, the conventional layered product produced using the present copper alloy powder has not obtained a copper alloy having all of high strength, high conductivity and excellent heat resistance.

JP 2017-115220 A

Shinji Tanaka et al., “Solidification Structure of Cu-Cr Alloy and Cu-Cr-Zr Alloy”, Journal of the Japan Institute of Metals, 74th, 6th, p. 356-364 Suzuki, S. et al., “Strength and Aging Structure of Cu—Cr—Zr Alloy”, Journal of the Japan Institute of Metals, Japan Institute of Metals, Vol. 628-633

The object of the present invention is to optimize the composition of the raw material powder, thereby enabling the production of a layered product having all of high strength, high conductivity and excellent heat resistance, and layered modeling. The object is to provide various metal parts such as motor brushes, brake pads, resistance welding electrodes, electric discharge machining electrodes, slip rings, and bearings.

The gist configuration of the present invention is as follows.
(1) Copper for additive manufacturing characterized by containing, by mass%, Cr: 0.010 to 1.50%, Zr: 0.010 to 1.40%, and the balance consisting of copper and inevitable impurities Alloy powder.
(2) Copper alloy powder as described in said (1) whose average particle diameter is the range of 10 micrometers or more and 40 micrometers or less.
(3) In the integrated particle size distribution obtained by measurement on a volume basis, the 50% particle size (d50) is 10 to 40 μm, and the 10% particle size (d10) is 1 to 30 μm. ) Copper alloy powder.
(4) The copper alloy powder according to (3) above, wherein the 90% particle size (d90) of the cumulative particle size distribution obtained by measurement on a volume basis is 30 to 70 μm.
(5) Pb: 0.01 to 1.0%, Bi: 0.01 to 1.0%, Ca: 0.01 to 1.0%, Sr: 0.01 to 1.0%, Ba: 0 0.01 to 1.0%, Te: 0.01 to 1.0%, Si: 0.01 to 1.0%, Sn: 0.01 to 1.0%, Mg: 0.01 to 1.0 %, Ni: 0.01 to 1.0%, Ag: 0.01 to 1.0%, and Mn: 0.01 to 1.0%, further containing one or more selected from the group (1 ) To (4) The copper alloy powder described in any one of the items.
(6) It is formed by melting and solidifying a copper alloy powder containing, by mass%, Cr: 0.010 to 1.50%, Zr: 0.010 to 1.40%, the balance being copper and inevitable impurities. A layered object having an apparent density of 94% or more and 100% or less and an electric conductivity of 50% IACS or more.
(7) The layered object according to (6), wherein the size of the precipitate present in the layered object is 5 μm or less.
(8) Pb: 0.01 to 1.0%, Bi: 0.01 to 1.0%, Ca: 0.01 to 1.0%, Sr: 0.01 to 1.0%, Ba: 0 0.01 to 1.0%, Te: 0.01 to 1.0%, Si: 0.01 to 1.0%, Sn: 0.01 to 1.0%, Mg: 0.01 to 1.0 %, Ni: 0.01 to 1.0%, Ag: 0.01 to 1.0%, and Mn: 0.01 to 1.0%. Or the layered object according to 7.
(9) A first step of forming a powder layer with the copper alloy powder according to any one of (1) to (5) above, and melting and solidifying the copper alloy powder present at a predetermined position of the powder layer. And a second step of forming a modeling layer, and sequentially stacking the modeling layer by sequentially repeating the first step and the second step.
(10) The method for producing a layered object according to (9), further including at least one step of a heat treatment step and a forging step after completion of repeated lamination of the modeling layer.
(11) A motor formed by using the copper alloy powder according to any one of (1) to (5) or the layered object according to any one of (6) to (8). brush.
(12) A brake pad formed using the copper alloy powder according to any one of (1) to (5) above or the layered object according to any one of (6) to (8) above .
(13) Resistance welding formed using the copper alloy powder according to any one of (1) to (5) above or the layered object according to any one of (6) to (8) above Electrode.
(14) Electric discharge machining formed using the copper alloy powder according to any one of (1) to (5) above or the layered object according to any one of (6) to (8) above. Electrode.
(15) A slip ring formed using the copper alloy powder according to any one of (1) to (5) above or the layered object according to any one of (6) to (8) above. .
(16) A bearing formed using the copper alloy powder according to any one of (1) to (5) above or the layered object according to any one of (6) to (8) above.

The present invention contains, in mass%, Cr: 0.010 to 1.50%, Zr: 0.010 to 1.40%, and the balance consisting of copper and unavoidable impurities, thereby providing high strength and high conductivity. And a copper alloy powder that enables production of a layered object having all of excellent heat resistance, a layered object and a method of manufacturing the layered object, and, for example, motor brushes, brake pads, resistance welding electrodes, electric discharge machining Various metal parts such as industrial electrodes, slip rings, and bearings can be provided.

In particular, the inclusion of chromium and zirconium in copper makes it possible to improve the light absorptance, so that it is possible to design a powder with excellent formability.

Moreover, the density of the layered object can be improved by using such an alloy powder, and the strength and conductivity can be improved as compared with pure copper by increasing the density of the layered object. Can do.

Furthermore, by using the additive manufacturing method, after melting the raw material copper alloy powder, it is possible to rapidly solidify the molten metal at a much higher cooling rate than the conventional casting method of producing a copper alloy, As a result, it is possible to refine the crystal grains by this rapid solidification and improve the strength, and also effectively suppress the generation of chromium and zirconium precipitates contained in the copper alloy, thereby improving the heat resistance. Can do.

FIGS. 1A and 1B illustrate two types of electrodes from parts manufactured by a layered manufacturing apparatus (3D printer) using the copper alloy powder according to the present invention as a material. 1 (a) is a resistance welding electrode, and FIG. 1 (b) is a schematic view of an electric discharge machining electrode.

Next, a preferred embodiment of the copper alloy powder according to the present invention will be described in detail below.
(Copper alloy powder)
The copper alloy powder of this embodiment contains, by mass%, Cr: 0.010 to 1.50%, Zr: 0.010 to 1.40%, and the balance is made of copper and inevitable impurities.

First, the reason for limiting the component composition of the copper alloy powder of the present invention will be described.
[Ingredient composition]
<Essential component>
・ Cr: 0.010-1.50 mass%
Cr (chromium) is a component having an effect of improving strength and heat resistance, and has a small amount of light absorption of a laser beam having a wavelength of 1.2 μm or less, particularly a fiber laser having a wavelength of 1.065 μm. It is an important element that can exert an enhancing effect on the surface. In order to exhibit such an effect, the Cr content is preferably 0.010% by mass or more. Further, if the Cr content exceeds 1.50% by mass, precipitates such as Cr ₂ Zr or Cu ₃ Zr are coarsened, so that the effect of improving the strength and heat resistance cannot be expected. For this reason, the Cr content is preferably in the range of 0.010 to 1.50 mass%.

・ Zr: 0.010 to 1.40 mass%
Zr (zirconium) is a component having an effect of improving heat resistance, and the light absorption rate of a laser beam having a wavelength of 1.2 μm or less, particularly a fiber laser having a wavelength of 1.065 μm, is small in each stage. It is an important element that can exert an enhancing action. In order to exhibit such an effect, the Zr content is preferably 0.010% by mass or more. Further, if the Zr content exceeds 1.40% by mass, precipitates such as Cr ₂ Zr or Cu ₃ Zr are coarsened, so that the effect of improving strength and heat resistance cannot be expected. Therefore, the Zr content is preferably in the range of 0.010 to 1.40% by mass.

<Optional components>
In the present invention, the above-described Cr and Zr are essential components, but other than these components, for example, Pb: 0.01 to 1.0%, Bi: 0.01 to 1.0% by mass% , Ca: 0.01 to 1.0%, Sr: 0.01 to 1.0%, Ba: 0.01 to 1.0%, Te: 0.01 to 1.0%, Si: 0.01 -1.0%, Sn: 0.01-1.0%, Mg: 0.01-1.0%, Ni: 0.01-1.0%, Ag: 0.01-1.0% and One or more elements selected from the group of Mn: 0.01 to 1.0% can also be contained as optional components as appropriate according to the required performance. These optional added components are elements added to improve the light absorption characteristics, and in order to improve such characteristics, it is preferable to contain 0.010% or more of each additive component. On the other hand, even if it adds more than the upper limit of the said content range of each additive component, it is because the improvement effect beyond it cannot be anticipated. Moreover, 0.05% or more and 0.3% or less are more preferable. Further, when these optional additional components are two or more kinds, the total content is preferably 0.02 to 2.0% by mass from the viewpoint that an effect of improving the light absorption rate can be expected.

<Remainder>
The balance consists of Cu and inevitable impurities other than the essential components and optional components described above. In addition, the “inevitable impurities” referred to here are mostly copper alloy particles, which are present in the raw material, or inevitably mixed in the manufacturing process, and are originally unnecessary, but in a trace amount, It is generally 0.05% by mass or less, and is an allowable impurity because it does not affect the properties of the copper alloy particles.

[Average particle size and particle size distribution of powder]
The copper alloy powder of this embodiment preferably has an average particle size in the range of 10 μm to 40 μm.

Further, the copper alloy powder of the present embodiment has a 50% particle size (d50) of 10 to 40 μm and a 10% particle size (d10) of 1 to 30 μm in an integrated particle size distribution obtained by measurement on a volume basis. More preferably, the 90% particle diameter (d90) is more preferably 30 to 70 μm.

In addition, the “average particle diameter” here means the volume average diameter MV. Further, “50% particle diameter d50” is also called median diameter, and means the particle diameter when the copper alloy powder is integrated from the small side to become 50% volume in the integrated particle size distribution obtained by measuring on a volume basis. To do. Furthermore, “10% particle diameter d10” means the particle diameter when the particles are integrated from the smaller side to become 10% volume in the integrated particle size distribution obtained by measurement on a volume basis. In addition, “90% particle diameter d90” described later means a particle diameter when particles are integrated from the smaller side to 90% volume in an integrated particle size distribution obtained by measurement on a volume basis.

And in this invention, by making the average particle diameter of copper alloy powder into the range of 10 micrometers or more and 40 micrometers or less, it becomes easy to fuse | melt at the time of laser irradiation, and it becomes possible to improve the density of a molded article, and also 50% particle diameter d50 is made. By making the thickness 10 to 40 μm, it becomes possible to improve the squeezing property of the powder. Further, by setting the 10% particle diameter d10 to 1 to 30 μm, the bulk density of the powder layer can be improved. During modeling, a powder layer can be formed by laying copper-based powder so that the porosity is small and high density, and a layered model consisting of a high-density copper alloy by subsequent laser irradiation Can be manufactured. On the other hand, if the average particle size of the copper alloy powder is less than 10 μm, there is a problem that the powder is scattered at the time of laser irradiation, and if it is more than 40 μm, the density of the shaped article due to incomplete melting of the powder occurs. There arises a problem of lowering and squeezing property. Further, when the 50% particle diameter d50 is less than 10 μm, there is a problem that the squeezing property is lowered, and when the 50% particle diameter d50 is more than 40 μm, there is a problem that the bulk density of the powder is lowered. Further, if the 10% particle diameter d10 is less than 1 μm, the problem of powder scattering at the time of laser irradiation occurs, and if the 10% particle diameter d10 exceeds 30 μm, the problem that the bulk density of the powder layer decreases.

In addition, the 90% particle size (d90) of the cumulative particle size distribution obtained by measurement on a volume basis is preferably 30 to 70 μm from the viewpoint of improving the bulk density of the powder layer. If the 90% particle diameter d90 is less than 30 μm, there may be a problem that the bulk density of the powder layer is reduced due to powder scattering during laser irradiation, and if the 90% particle diameter d90 is more than 70 μm, the powder layer This is because there is a possibility that the density of the shaped article is lowered due to the reduction of the bulk density.

(Layered product)
The layered object of this embodiment contains, by mass%, a copper alloy powder containing Cr: 0.010 to 1.50%, Zr: 0.010 to 1.40%, with the balance being copper and inevitable impurities. A layered product formed by melting and solidifying, wherein the layered product has an apparent density of 94% or more and 100% or less, and a conductivity of 50% IACS or more. In the layered object of the present embodiment, the reason why the apparent density is limited to 94% or more and 100% or less is that the layered object formed of a copper alloy formed using a conventional copper-based powder has a porosity of 6. %, The apparent density of the layered product could not be 94% or more and 100% or less, but in this embodiment, as described above, optimization of the particle size and particle size distribution of the raw material powder As a result, it is possible to form a layered object formed of a copper alloy having an apparent density of 94% or more and 100% or less. When the apparent density is 100%, it means the same as the theoretical density of the bulk copper alloy, and the layered object of this embodiment is a high-density high alloy equivalent to the copper alloy (bulk). Can be configured.

In the present embodiment, the internal porosity can be reduced by using Cu—Cr—Zr alloy powder, which has better formability than pure copper, and the internal porosity can be reduced, and a high conductivity of 50% IACS or higher can be achieved. can do.

Furthermore, the size of the precipitates such as Cr ₂ Zr and Cu ₃ Zr present in the layered object is preferably 5 μm or less in order to obtain high strength and excellent heat resistance. This is because the Cu—Cr—Zr alloy is an age-hardening type copper alloy, and when the size of the precipitate becomes larger than 5 μm, the strength and heat resistance tend to decrease.

(Manufacturing method of layered object)
The manufacturing method of the layered object according to the present embodiment includes, for example, the above-described first step of forming a powder layer with a copper alloy powder and melting and solidifying the copper alloy powder existing at a predetermined position of the formed powder layer. A layered object can be manufactured by laminating a modeling layer by sequentially repeating the first step and the second step, including a second step of forming a layer. More specifically, a thin powder layer is formed by spreading copper alloy powder with a thickness of about 0.05 mm by squeezing with a recoater on a shaping / processing table that can be raised and lowered (the first step), and then CAD. Based on the data, a laser beam is irradiated, and only the irradiated portion of the powder layer is melted and solidified to form a modeling layer (second step). Further, a new powder layer is formed and laser beam irradiation is performed by a laser additive manufacturing apparatus ( What is necessary is just to manufacture a layered modeling thing by repeatedly performing using what is called a 3D printer.

Moreover, in order to obtain the required characteristics according to the application, it is preferable to further perform at least one of a heat treatment step and a forging step after completion of repeated lamination of the modeling layer as necessary.

Further, when squeezing the copper alloy powder uniformly, it is more preferable to apply a high frequency of 5 kHz or more to the recoater from the viewpoint that the porosity (porosity) of the layered object is reduced and the apparent density is increased. . This gives vibration to the phenomenon that the copper alloy powder is stuck to extremely fine surface scratches (size: ~ 10μm) on the surface of the blade used for squeezing and cannot be squeezed uniformly. It will improve. As a result, the copper alloy powder is more uniformly dispersed, so that the gaps between the copper alloy powders having relatively large particle diameters become uniform, and the copper alloy powder having a relatively small particle diameter easily enters the voids. As the thermal resistance between the copper alloy powders becomes uniform, the laser light energy converted into thermal energy diffuses uniformly, which increases the apparent density of the copper alloy (laminated model) after melting and solidification. This is because it is improved.

(Use of the layered object of the present invention)
The layered object of the present invention can be applied in various technical fields and applications as various metal parts using copper alloy materials. Specifically, it can be applied to various metal parts, and is particularly suitable for use in motor brushes, brake pads, resistance welding electrodes, electric discharge machining electrodes, slip rings, bearings, and the like. FIGS. 1A and 1B illustrate two types of electrodes from parts manufactured by a layered manufacturing apparatus (3D printer) using the copper alloy powder according to the present invention as a material. 1 (a) is a resistance welding electrode, and FIG. 1 (b) is a schematic view of an electric discharge machining electrode.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, All the aspects included in the concept of this invention and a claim are included, and various within the scope of this invention. Can be modified.

Next, in order to further clarify the effects of the present invention, examples and comparative examples will be described, but the present invention is not limited to these examples.

(Examples 1 to 22 and Comparative Examples 1 to 5)
Each component was weighed so as to have the component composition shown in Table 1, and the weighed component was put into a melting furnace and melted to prepare a copper alloy (ingot). Each produced copper alloy (ingot) was mechanically pulverized, and the pulverized product of the pulverized copper alloy was dissolved in a gas atomizer and then sprayed to obtain copper alloy particles. In order to obtain fine particles, the inside of the spray tank of the gas atomizer was an atmosphere filled with a mixed gas of 85 volume% N ₂ and 15 volume% H ₂ or He gas. The recovered copper alloy powder (particles) was sieved and subjected to sizing. The particle size distribution of the sized particles is measured with a laser diffraction particle size distribution measuring device (SALD-2300, manufactured by Shimadzu Corporation), and the 50% particle size ( d50) 10% particle diameter (d10) and 90% particle diameter (d90) were determined. Further, the average particle size of the powder was determined by a light diffraction / scattering method.

Next, using the produced material powder as a laser additive manufacturing apparatus, Concept Laser M2 (wavelength 1065 nm, output 400 W), an additive manufacturing object (copper alloy part) having a size of 130 mm × 20 mm × 9 mm is prepared. Test pieces of 120 mm × 14 mm × 3 mm were prepared by cutting to ensure removal of the powder and a smooth surface. Each produced model (copper alloy part) was measured for apparent density (%) by Archimedes method. The apparent density (%) is the value when the true density (theoretical density of the bulk) is 100%.

Table 1 shows the average particle diameter, d10, d50, and d90 of each material powder used as the material of the layered object, and the porosity (%) and overall judgment of each object (copper alloy part). In addition, based on each result of the apparent density, the tensile strength, the electrical conductivity, and the heat resistance of the layered object (copper alloy part), the comprehensive judgment is based on the following criteria: “A”, “B”, “C ”,“ D ”, and“ E ”. In the present embodiment, the overall judgment is “A”, “B”, “C”, and “D”.

The apparent density of the layered object (copper alloy part) was “◯” when 95% or more, “Δ” when 94% or more and less than 95%, and “X” when less than 94%.

(Tensile strength)
The tensile strength was measured according to JIS Z2241: 2001 using a precision universal testing machine (manufactured by Shimadzu Corporation) to measure the tensile strength (MPa). In addition, the said test was implemented on the conditions for the distance between gauge points to 5 cm, and a deformation speed to 10 mm / min. Moreover, the tensile test measured 3 each, and was taken as each average value (N = 3). In this example, “◯” indicates that the tensile strength is 250 MPa or more, “Δ” indicates that the tensile strength is 200 MPa or more and less than 250 MPa, and “x” indicates that the tensile strength is less than 200 MPa.

(Heat-resistant)
For heat resistance, a test piece similar to the test piece measured by tensile strength was prepared, and a tensile test was performed under the same conditions as described above for a test piece heated at 300 ° C. for 10 hours in a heat treatment furnace. The tensile strength (MPa) was measured and evaluated from the average value of the measured tensile strength. Table 1 shows the case where the tensile strength after heating is lower than the tensile strength before heating by 150 MPa or more, “X”, the case where it is 100 MPa or more and less than 150 MPa is “Δ”, and the case where it is less than 100 MP is “◯”.

(conductivity)
The conductivity was measured for two specimens in a thermostatic chamber controlled at 20 ° C. (± 1 ° C.) using a four-terminal method according to JIS H0505-1975, and the average value (% IACS) ) Was calculated. The distance between terminals at this time was 100 mm. In this example, the case where it is 60% IACS or more is evaluated as “◯” as excellent conductivity, and the case where it is 50% IACS or more and less than 60% IACS is determined as “Δ” as good conductivity. And when it is less than 50% IACS, it evaluates as "x" as electroconductivity being inferior, and it shows in Table 1.

<Comprehensive judgment>
A: When all of the four items of the apparent density, tensile strength, heat resistance, and conductivity of the layered object (copper alloy part) are “◯”.
B: Of the apparent density, tensile strength, heat resistance and electrical conductivity of the layered object (copper alloy part), 3 items are “◯” and 1 item is “Δ”.
C: When the apparent density of the layered object (copper alloy part) is “◯” for two items and “Δ” for two items among the tensile strength, heat resistance and electrical conductivity.
D: When the apparent density of the layered object (copper alloy part) is “◯” for 3 items and “Δ” for 3 items among the tensile strength, heat resistance and electrical conductivity.
E: In the case of “x” in at least one item of the apparent density, tensile strength, heat resistance and electrical conductivity of the layered product (copper alloy part), or when the layered product could not be formed.

From the results shown in Table 1, in all of Examples 1 to 22, the Cr and Zr contents are within the scope of the present invention, the apparent density of the layered product (copper alloy part) is 94% or more, and the tensile strength Was 200 MPa or more, at least one of conductivity and heat resistance was “Δ” or more, and the overall judgment was a pass level of “A” to “D”. On the other hand, since Comparative Examples 1 to 3 do not contain Zr, the apparent density of the layered product (copper alloy part) is less than 94%, the heat resistance is “Δ”, and the conductivity is “x”. Or it was "△" and the comprehensive judgment was "E" and failed. In Comparative Example 4, the content of Cr and Zr was larger than the appropriate range of the present invention, so that a layered product (copper alloy part) could not be formed. Since Comparative Example 5 does not contain Cr or Zr, the apparent density of the layered product (copper alloy part) is less than 94%, the tensile strength is less than 200 MPa and “x”, and the heat resistance is also “x”. Yes, the overall judgment was “E”.

According to the present invention, a copper alloy powder, a laminate model, and a method for manufacturing a laminate model that enable the manufacture of a laminate model having all of high strength, high conductivity, and excellent heat resistance, and, for example, a motor Various metal parts such as brushes, brake pads, resistance welding electrodes, electrical discharge machining electrodes, slip rings, and bearings can be provided. The layered object manufactured with the copper alloy powder of the present invention can be applied to various metal parts, particularly for motor brushes, brake pads, resistance welding electrodes, electric discharge machining electrodes, slip rings, bearings, etc. Suitable for use.

10 Electrode for resistance welding 20 Electrode for electrical discharge machining

Claims (16)

A copper alloy powder for additive manufacturing, characterized by containing, by mass%, Cr: 0.010 to 1.50%, Zr: 0.010 to 1.40%, and the balance consisting of copper and inevitable impurities. The copper alloy powder according to claim 1, wherein the average particle size is in the range of 10 μm to 40 μm. The copper alloy according to claim 1 or 2, wherein the 50% particle diameter (d50) of the cumulative particle size distribution obtained by measurement on a volume basis is 10 to 40 µm and the 10% particle diameter (d10) is 1 to 30 µm. Powder. The copper alloy powder according to claim 3, wherein the 90% particle diameter (d90) of the cumulative particle size distribution obtained by measurement on a volume basis is 30 to 70 µm. Pb: 0.01 to 1.0%, Bi: 0.01 to 1.0%, Ca: 0.01 to 1.0%, Sr: 0.01 to 1.0%, Ba: 0.01 to 1.0%, Te: 0.01 to 1.0%, Si: 0.01 to 1.0%, Sn: 0.01 to 1.0%, Mg: 0.01 to 1.0%, Ni The composition further comprises one or more selected from the group consisting of: 0.01 to 1.0%, Ag: 0.01 to 1.0%, and Mn: 0.01 to 1.0%. The copper alloy powder according to claim 1. Laminated molding formed by melting and solidifying a copper alloy powder containing, in mass%, Cr: 0.010 to 1.50%, Zr: 0.010 to 1.40%, the balance being copper and inevitable impurities A thing,
A layered object having an apparent density of 94% or more and 100% or less and a conductivity of 50% IACS or more. The layered object according to claim 6, wherein the size of the precipitate existing in the layered object is 5 μm or less. Pb: 0.01 to 1.0%, Bi: 0.01 to 1.0%, Ca: 0.01 to 1.0%, Sr: 0.01 to 1.0%, Ba: 0.01 to 1.0%, Te: 0.01 to 1.0%, Si: 0.01 to 1.0%, Sn: 0.01 to 1.0%, Mg: 0.01 to 1.0%, Ni The composition further comprises one or more selected from the group consisting of: 0.01 to 1.0%, Ag: 0.01 to 1.0%, and Mn: 0.01 to 1.0%. The layered object described. A first step of forming a powder layer with the copper alloy powder according to any one of claims 1 to 5,
A second step of forming a modeling layer by melting and solidifying the copper alloy powder present at a predetermined position of the powder layer,
The manufacturing method of the layered object, wherein the first layer and the second step are sequentially repeated to stack the modeling layer. The method for manufacturing a layered object according to claim 9, further comprising at least one step of a heat treatment step and a forging step after completion of repeated lamination of the modeling layer. A motor brush formed by using the copper alloy powder according to any one of claims 1 to 5 or the layered object according to any one of claims 6 to 8. A brake pad formed by using the copper alloy powder according to any one of claims 1 to 5 or the layered object according to any one of claims 6 to 8. An electrode for resistance welding formed by using the copper alloy powder according to any one of claims 1 to 5 or the layered object according to any one of claims 6 to 8. An electrode for electric discharge machining formed by using the copper alloy powder according to any one of claims 1 to 5 or the layered object according to any one of claims 6 to 8. A slip ring formed by using the copper alloy powder according to any one of claims 1 to 5 or the layered object according to any one of claims 6 to 8. A bearing formed using the copper alloy powder according to any one of claims 1 to 5 or the layered object according to any one of claims 6 to 8.

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