TWI634565B - Cable wire graphene composite - Google Patents

Abstract

The present invention relates to a graphene composite material for a cable, mainly a cable body, the cable system is composed of graphene and aluminum, and the weight percentage of the graphene is 0.3 wt% to 3.5 wt%, and the The weight percentage of aluminum is from 96.5 wt% to 99.7 wt%. A composite material of graphene and pure aluminum is used as the composition of all components of the cable body, thereby increasing the strength of the cable body by utilizing the rigidity of the graphene, and utilizing the extremely high surface conductivity of the graphene to make the cable body In the strengthening treatment, not only can increase the Tensile Strength, but also maintain the conductivity of aluminum at 61% or more, and let the cable body have better tensile strength, so that the spacing of the high-voltage tower Can be greatly increased, reducing the setting of high voltage towers.

Description

Cable wire graphene composite

The invention provides a graphene composite material of a cable wire, in particular to a cable body composed of a composite material composed of graphene and pure aluminum, which has low material cost, high tensile strength and good electrical conductivity. A graphene composite material with a characteristic cable.

According to the conventional cable, a metal conductive material such as copper or aluminum is usually used as the cable core, and a polymer material such as polyvinyl chloride is used as the external insulating protective material. Cable core material, in particular copper to apply more widely, because in that its copper 59.6 (S.m ^-1 .10 ⁶⁾ after the electrical conductivity electrical conductivity silver 63 (S.m ^-1 .10 ⁶⁾ of ( The material cost of silver is extremely high and is not considered). But as the core material of copper aerial cable, the specific gravity and cost relationships, typically use lighter weight (8.96g / cm ³ greater than the aluminum copper 2.7g / cm ^3), of lower cost aluminum.

Each cable of the high-altitude cable is a bundle of multiple wires that are stretched side by side and joined, twisted or braided together to form two or more wires of a single assembly. These wires are often selected from aluminum or aluminum alloys. For cables used in high-altitude power transmission applications, the required performance requirements include corrosion resistance, environmental durability (eg UV and humidity), and resistance to high temperatures. Strength loss, creep resistance and relatively high modulus of elasticity, low density, low coefficient of thermal expansion, high electrical conductivity, high strength, and high thermal conductivity.

Pure aluminum high-altitude cable, because of its low tensile strength and high ductility, can not withstand the weight of long-distance cable, even after cold-processed H18, its hardness (Bardness Brinell) Can not break through 100HB, so there are currently cases of Aluminium Conductor Steel Reinforced (ACSR) or Aluminium Conductor Composite Core (ACCC). Both of them are in pure aluminum cable, and a steel core or carbon fiber core is arranged in the center in a sandwich-like manner. As far as the steel core is concerned, although the steel itself has good conductivity, the specific gravity is very high, and it is used as a high altitude. Cables are prone to sagging deformation due to weight. As carbon fiber cores have extremely low specific gravity, carbon fiber materials are extremely costly, and even if they are only used as a central support structure, they are not cost effective. Moreover, although the carbon fiber itself is not an insulator, the electrical resistivity is much larger than that of aluminum, and the electrical conductivity is extremely low, which greatly reduces the conductive area of the cable. Therefore, steel-core aluminum cables and carbon fiber aluminum cables are high-altitude cables, which is a fatal flaw.

With the high-altitude cable of today's technology, the primary evolutionary space lies in the balance of conductivity, strength and cost. The conductivity of the element cannot be improved, so how to reduce the conductivity without affecting the conductivity. The material increases the strength of the cable, which is the focus of improvement. According to the basic common sense of material science, in order to increase the strength of aluminum, it can generally pass through solid solution strengthening, processing strengthening, dispersion strengthening and precipitation strengthening, etc., because solid solution strengthening (such as alloy) and dispersion strengthening will cause conductivity. The sharp drop is not considered, and the processing strengthening and precipitation strengthening can increase the hardness and strength of the material. On the contrary, it will also lower the material elongation, and at the same time, the processing will cause the lattice to be compressed and extruded, and the conductive The rate is affected.

According to the People's Republic of China Patent No. CN103820685A "Conductivity 60% IACS Medium Strength Aluminum Alloy Wire and Its Preparation Method", it is a composite of precipitated strengthening phase with magnesium telluride (Mg ₂ Si) as the main phase and mixed with pure aluminum. The material is used as the material of the cable, and is called the aluminum alloy wire with 60% conductivity.

However, when the above-mentioned conductivity 60% IACS medium-strength aluminum alloy wire is used, the following problems and defects are indeed to be improved:

1. Magnesium telluride (Mg ₂ Si) is a micro-semiconductor whose conductivity is not good. When it is mixed with pure aluminum, it will cause the conductivity of aluminum to decline.

Second, the magnesia coefficient of magnesium telluride (Mg ₂ Si) is 130GPa, and its rigidity is not only less than 190~210GPa of alloy or steel, but also less than 1000GPa of graphene.

3. The average particle size of magnesium telluride (Mg ₂ Si) is 100 nm or more, and the uniformity is poor when mixed with pure aluminum, which results in an effect of improving the strength of aluminum.

Since the cable core material is the key to determine the electrical transmission performance of the cable, its performance will directly affect the performance of the electrical transmission performance. Only by realizing the breakthrough of the cable core material can a new type of cable with excellent performance be developed. How to solve the problems and disadvantages of the above-mentioned practices, that is, the inventors of the present invention and those involved in the industry are eager to study the direction of improvement.

Therefore, the inventors of the present invention have collected the relevant materials in view of the above-mentioned shortcomings, and through multi-party evaluation and consideration, and through years of experience accumulated in the industry, through continuous trial and modification, the design of such graphene and pure A composite material made of aluminum is made into a cable body, and an invention patent of a graphene composite material having a cable material having low material cost, high tensile strength, and good electrical conductivity.

The main purpose of the invention is to use graphene as the only precipitation strengthening phase and mix with pure aluminum to form a cable core material which is advantageous for the use of high-altitude cables.

Another main object of the present invention is to utilize a low cost, high strength, high thermal conductivity and high electrical conductivity of graphene to mix with pure aluminum to form a cable body having advantages of several times strength, high electrical conductivity, low cost and the like.

Another main object of the present invention is to reduce the material cost of the cable body, reduce the gravity burden of the cable body, increase the tower distance between the high-voltage towers, reduce the setting and installation cost of the high-voltage tower, and thereby reduce the public. A negative perception of high voltage electric towers.

In order to achieve the above object, the main structure of the present invention comprises: a cable body, the cable system is composed of a mixture of graphene and aluminum, and the weight percentage of the graphene is 0.3 wt% to 3.5 wt%, and the aluminum The weight percentage is from 96.5 wt% to 99.7 wt%. When the user uses the present invention to erect a high-altitude cable, since the present invention is a composite material composed of graphene and pure aluminum, which is composed of all components of the cable body, the rigidity of the graphene can be increased to increase the cable body. The strength and the high surface conductivity of graphene make the cable body not only increase the Tensile Strength, but also maintain the conductivity of aluminum at 61% or more. The cable body has better tensile strength, so that the spacing of the high-voltage electric tower can be greatly increased, and the setting of the high-voltage electric tower is reduced, especially the weight of the graphene itself is extremely light, the material cost is also low, and the low-cost metal The material is made of aluminum and is more effective in reducing the overall material cost.

By the above technique, the magnesium oxide (Mg ₂ Si) and the pure aluminum which are present in the high-strength aluminum alloy wire of the conventional conductivity 60% IACS can be made to cause the electrical conductivity of the aluminum to decline and the rigidity condition is far less than that of the graphene. The problems such as insufficient strength and volume are not enough, and the uniformity is poor when pure aluminum is mixed, and the breakthrough is achieved, and the practical advantages of the above advantages are achieved.

1‧‧‧ cable body

11‧‧‧ Graphene

12‧‧‧Aluminium

2‧‧‧High voltage tower

The first figure is a perspective view of a preferred embodiment of the invention.

The second drawing is a schematic diagram of the composition of the preferred embodiment of the present invention.

The third figure is a pure aluminum processing parameter list of the preferred embodiment of the present invention.

The fourth figure is a composite material processing parameter table according to a preferred embodiment of the present invention.

Figure 5 is a diagram showing the state of use of the preferred embodiment of the present invention.

In order to achieve the above objects and effects, the technical means and the structure of the present invention will be described in detail with reference to the preferred embodiments of the present invention.

Please refer to the first to fifth figures, which are perspective views to the state of use of the preferred embodiment of the present invention. It is clear from the drawings that the present invention includes: a cable body 1, the cable body 1 It is composed of a mixture of graphene 11 and aluminum 12, and the weight percentage of the graphene 11 is 0.3 wt% to 3.5 wt%, and the weight percentage of the aluminum 12 is 96.5 wt% to 99.7 wt%, wherein the graphene 11 The optimum value of the weight percentage is 1.5 wt%, and the optimum value of the weight percentage of the aluminum 12 is 98.5 wt%.

The cable strength of the cable body 1 is 250 MPa to 400 MPa, and the tensile strength of the cable body 1 is 300 MPa to 450 MP, and the electrical conductivity of the cable body 1 (IACS) %) is 60% to 65%.

According to the above description, the structure of the present technology can be understood, and according to the corresponding cooperation of the structure, the cable body 1 is made of a composite material composed of graphene 11 and pure aluminum 12, and has low material cost and tensile strength. Advantages such as high strength (Tensile Strength) and good electrical conductivity, and detailed explanations will be explained below.

Since the conductivity of graphene 11 itself is 170% (the actual conductivity (IACS%) is 100% to 170% based on the conductivity of 100% of copper), it is a highly conductive material, so when mixed with pure aluminum 12 The cross-sectional area of the cable body 1 having a conductive force is not reduced, and when the graphene 11 is used as the main precipitation strengthening phase, the graphene 11 itself is a single-layer planar structure, and each layer is in a disconnected state. Therefore, the conductivity of the aluminum 12 is not affected by the action of precipitation strengthening, so that at least the original conductivity of the aluminum 12 can be maintained, and the high conductivity of the graphene 11 is combined to increase the conductivity of the cable body 1 to At least 63%.

Moreover, since the particle size of the graphene 11 itself is one hundredth of that of magnesium telluride, and the density ratios of the two are similar, the present invention uses graphene 11 mixed pure aluminum 12 in comparison with the mixing of magnesium telluride and pure aluminum 12. The graphene 11 can be evenly dispersed between the aluminum 12, which is more helpful for the improvement of the mechanical strength of the cable body 1. In particular, the Young's modulus of graphene 11 is 1000 GPa, which is second only to the grade of diamond. When graphene 11 is used as the main precipitation strengthening phase, the basic strength of the cable body 1 can be greatly increased by more than three times. , including Yield Strength, Tensile Strength, and Hardness Brinell, and the manufacture of the cable body 1 is inevitably subjected to cold working during the drawing, and therefore, the present invention After the cold processing of the composite material, the strength of the cable body 1 will be increased again, although the strengthening action will still reduce the elongation, but also because of the high elongation of the graphene 11, the pure aluminum 12 is in the graphite After the olefin 11 is compounded, it still has a performance of 10% to 30%. As shown in the third and fourth figures, the composite materials of pure aluminum 12 and pure aluminum 12 combined with graphene 11 respectively represent the actual conditions of each parameter after cold treatment of different strengths.

In addition, since the thermal conductivity of graphene 11 is from 2000 W/mK to 5300 W/mK, and the graphene 11 having a thermal conductivity of 5300 W/mK is combined with aluminum 12, the overall thermal conductivity is also greatly increased, and at the same time, because of the cable. The strength of the body 1 is better, the cross-sectional area of the cable body 1 can be reduced, and the heat receiving area of the cable body 1 can be reduced, and the risk of thermal deformation of the cable body 1 can be greatly reduced by the high heat conduction effect.

However, the above description is only the preferred embodiment of the present invention, and thus it is not intended to limit the scope of the present invention. Therefore, the simple modification and equivalent structural changes of the present specification and the drawings should be treated similarly. It is included in the scope of the patent of the present invention and is combined with Chen Ming.

Therefore, the key to improving the conventional use of the graphene composite material of the cable of the present invention is:

First, the graphene 11 itself has excellent electrical conductivity. When it is made of a composite material with pure aluminum 12, not only the conductive cross-sectional area of the cable body 1 can be completely preserved, but also the electrical conductivity can be maintained and even improved after the processing is strengthened.

Second, the graphene 11 itself is extremely rigid. When it is made of a composite material with pure aluminum 12, the base strength can be greatly increased to about three times, and it can be raised again after the processing is strengthened, and the electrical conductivity is not lowered.

3. Graphene 11 itself has a low specific gravity and a small particle size. When it is made of a composite material with pure aluminum 12, it not only does not increase the weight burden of the cable body 1, but can also be easily distributed evenly between the aluminum 12, and is effective. Improve mechanical strength.

Fourth, graphene 11 and aluminum 12 are low-cost materials, and the overall material cost performance is also excellent when made into composite materials.

5. Effectively reduce the gravity burden of the cable body 1, increase the tower distance between the high voltage electric towers 2, reduce the installation amount and installation cost of the high voltage electric tower 2.

In summary, the graphene composite material of the cable of the present invention can achieve its efficacy and purpose when used, so the invention is an invention with excellent practicability, and is an application for conforming to the invention patent, To file an application, I hope that the trial committee will grant the invention as soon as possible to protect the inventor's hard work. If there is any doubt in the trial committee, please do not hesitate to give instructions, the inventor will try his best to cooperate, and feel really good.

Claims (9)

A graphene composite material for a cable, comprising: a cable body, the cable system is composed of a mixture of graphene and aluminum, and the weight percentage of the graphene is 0.3 wt% to 3.5 wt%, and the aluminum The weight percentage is from 96.5 wt% to 99.7 wt%. The graphene composite material of the cable of claim 1, wherein the graphene has an optimum weight percentage of 1.5 wt%, and the aluminum has an optimum weight percentage of 98.5 wt%. The graphene composite material of the cable of claim 1, wherein the cable body has a yield strength of 250 MPa to 400 MPa. The graphene composite material of the cable of claim 1, wherein the cable body has a Tensile Strength of 300 MPa to 450 MPa. The graphene composite material of the cable of claim 1, wherein the cable body has a conductivity (IACS%) of 60% to 65%. The graphene composite material of the cable of claim 1, wherein the cable body has a Young's modulus of 1000 GPa. The graphene composite material of the cable of claim 1, wherein the graphene is evenly distributed between the aluminum. The graphene composite material of the cable of claim 1, wherein the graphene has a conductivity (IACS%) of 100% to 170%. The graphene composite material of the cable of claim 1, wherein the graphene has a thermal conductivity of from 2000 W/mK to 5300 W/mK.