Preparation method of high-strength heat-resistant aluminum alloy wire

Abstract

The invention relates to a preparation method of a high-strength heat-resistant aluminum alloy wire, and belongs to the technical field of alloy preparation. Cerium nitrate and rubidium nitrate are mixed, ground and dispersed in a graphene oxide solution, then a silane coupling agent is added for treatment, then the rare earth metal modification additive is prepared, rare earth elements in the rare earth metal modification additive can refine crystal grains of the aluminum alloy, and therefore the mechanical property and heat resistance of the aluminum alloy are improved; the refining agent is formed by mixing sodium metaaluminate, sodium fluosilicate and aluminum silicate according to the mass ratio of 1: 1: 1, the refining agent can chemically react with gas and impurities in the aluminum alloy at the high temperature, gas compounds and precipitates are generated, and non-metallic inclusions and tiny metal particles are removed through slagging-off treatment. Meanwhile, the refining agent can refine grains of the aluminum alloy and improve the mechanical property and the processability of the aluminum alloy, so that the electric conductivity and the heat resistance of the aluminum alloy wire are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of alloy preparation, and relates to a method for preparing a high-strength heat-resistant aluminum alloy wire. Background Art

[0002] With the continuous development of modern industrial technology, the performance requirements for wires and cables are getting higher and higher, especially in harsh environments such as high temperature and high current density. Traditional wire and cable materials are often difficult to meet the requirements. Therefore, it is particularly important to develop a new type of aluminum alloy wire with high conductivity and high heat resistance.

[0003] At present, there are some heat-resistant aluminum alloy wire products on the market, but these products often have problems such as insufficient conductivity and limited heat resistance, which makes it difficult to meet the needs of high-end application fields. In order to overcome these defects, researchers began to explore how to improve the conductivity and heat resistance of aluminum alloy wire by adjusting the alloy composition and preparation process.

[0004] Traditional aluminum alloy wire preparation methods often have problems such as high energy consumption, low production efficiency, and unstable product quality. Therefore, developing an efficient, energy-saving, and environmentally friendly aluminum alloy wire preparation method is of great significance for improving product quality and production efficiency.

[0005] Based on the above background, the present invention proposes a method for preparing a high-conductivity heat-resistant aluminum alloy wire. The method achieves a significant improvement in the conductivity and heat resistance of the aluminum alloy wire by optimizing the alloy composition and the preparation process. Summary of the invention

[0006] The object of the present invention is to provide a method for preparing a high-strength heat-resistant aluminum alloy wire, which has the characteristics of high electrical conductivity and good heat resistance.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A method for preparing a high-strength heat-resistant aluminum alloy wire. The raw materials of the high-conductivity heat-resistant aluminum alloy wire are as follows: by mass percentage, 0.4-0.6% copper, 0.2-0.3% zirconium, 0.05-0.15% indium, 0.05-0.15% cobalt, 0.05-0.15% yttrium, 0.05-0.15% molybdenum, 0.1-0.3% rare earth metal modification additive, 0.3-0.5% refining agent, and the balance is aluminum ingot.

[0009] The preparation method of the rare earth metal modified additive is as follows:

[0010] Cerium nitrate and rubidium nitrate were mixed in a mass ratio of 1:1, and ground in a ball mill at a speed of 400 r / min for 1 hour to obtain a mixture, and the mixture was dispersed in a graphene oxide solution with a mass fraction of 50%, and the mass ratio of the mixture to the graphene oxide solution was 1:1, and then 2wt% of a silane coupling agent was added, ultrasonicated for 0.5h, filtered, and dried at 110°C for 12h to obtain a rare earth metal modification additive;

[0011] The specific process of the method for preparing the high conductivity heat-resistant aluminum alloy wire is as follows:

[0012] S1: placing an aluminum ingot into a smelting furnace to melt and obtain aluminum liquid, the aluminum liquid temperature is 720-750°C, and copper, zirconium, indium, cobalt, yttrium, and molybdenum are added in sequence according to the formula ratio to obtain a mixed alloy melt;

[0013] S2: The mixed alloy melt is fully stirred at a stirring rate of 300 r / min. After stirring for 2 hours, a rare earth metal modification agent is added to increase the stirring rate to 400 r / min and continue stirring. After stirring for 6 hours, a refining agent is added for refining at a refining temperature of 740-760°C. After refining, slag removal is performed, and a slag removal machine is used to remove the refined solid impurities. After slag removal, the melt is allowed to stand for 12 hours to obtain a refined mixed alloy melt;

[0014] S3: casting the refined mixed alloy melt into a continuous casting mold, performing a continuous casting operation to obtain an aluminum alloy ingot, hot rolling the aluminum alloy ingot, and obtaining an aluminum alloy rod by continuous casting and rolling;

[0015] S4: further heat-treating the obtained aluminum alloy rod material, placing the heat-treated aluminum alloy rod material into a wire drawing machine for wire drawing operation, and drawing it into an aluminum alloy single wire to obtain the high conductivity heat-resistant aluminum alloy wire.

[0016] Further, the preparation method of the refining agent is as follows:

[0017] Sodium aluminate, sodium fluorosilicate and aluminum silicate are mixed in a mass ratio of 1:1:1, put into a ball mill for grinding, the ball mill speed is 500r / min, the grinding time is 1h, and sieved to obtain a refining agent with a particle size of 500 mesh.

[0018] Furthermore, the silane coupling agent is one of silane coupling agent KH-560 and silane coupling agent KH-792.

[0019] Furthermore, the purity of the aluminum ingot in S1 is ≥99.7%.

[0020] Furthermore, the hot rolling parameters in S3 are that the rolling temperature is 500-560°C.

[0021] Furthermore, the heat treatment parameters in S4 are a heat treatment temperature of 380 to 500° C. and a duration of 30 to 50 hours.

[0022] Furthermore, the diameter of the aluminum alloy single wire obtained by wire drawing in S4 is 3.22 mm.

[0023] The present invention effectively improves the electrical conductivity and heat resistance of the aluminum alloy wire by controlling the alloy composition and adding rare earth metal modification additives during the preparation process, so that the aluminum alloy wire can still maintain excellent electrical conductivity in a high temperature environment.

[0024] The present invention adopts a melting, stirring, refining and casting process, combined with hot rolling and heat treatment technology, to optimize the preparation process of aluminum alloy wire, significantly improve production efficiency, while ensuring product quality, and through wire drawing and stranding processing, high conductivity and heat-resistant aluminum alloy wire with uniform diameter and stable performance is prepared, meeting the needs of different fields for high-performance aluminum alloy wire.

[0025] The addition of elements such as copper, zirconium, indium, cobalt, yttrium, and molybdenum improves the electrical conductivity and heat resistance of aluminum alloys by adjusting the microstructure and electron distribution of the alloy; the introduction of rare earth metal modification additives utilizes the special electronic structure and chemical properties of rare earth elements to further optimize the microstructure of the alloy and enhance the electrical conductivity and heat resistance of the alloy.

[0026] When copper and aluminum form a solid solution, the lattice structure will be distorted to a certain extent, which enhances the mechanical properties of the alloy. The melting point of copper is higher than that of aluminum, and the melting point of the solid solution formed by copper and aluminum is also relatively high, thereby improving the melting point and thermal stability of the aluminum alloy. Copper is an excellent conductive and thermal conductive material. Adding an appropriate amount of copper can improve the conductivity and thermal conductivity of the aluminum alloy; adding zirconium to the aluminum alloy can refine the matrix grains, inhibit the recrystallization behavior of the aluminum alloy, and increase the recrystallization temperature of the alloy, thereby improving the heat resistance of the alloy. During the heat treatment process, zirconium precipitates Al3Zr intermetallic compounds. This compound is very stable at the operating temperature of the wire, can pin grain boundaries and dislocations, and hinder the movement of grain boundaries and dislocations, thereby improving the tensile strength and heat resistance of the aluminum wire; indium can reduce the polarization of the aluminum anode, making it easier for aluminum to lose electrons, and may play a role in improving electrochemical activity or corrosion resistance in aluminum alloys; cobalt has good Conductive properties. Although its resistivity is higher than that of copper and aluminum, adding a proper amount to the alloy can optimize the overall conductive properties, and cobalt can still maintain good conductive properties at high temperatures, which helps to improve the high-temperature conductive stability of aluminum alloy wires; yttrium can significantly improve the mechanical properties of aluminum alloys such as yield strength, elongation and hardness, prevent oxidation and corrosion on the surface of aluminum alloys, and extend the service life of aluminum alloys. The addition of yttrium can also improve the forming performance and processing stability of aluminum alloys, and can also improve the heat treatment effect of aluminum alloys; the compound formed by molybdenum and aluminum forms a solid solution at the grain boundary, limits the occurrence of intercrystalline slip, and improves the tensile stress and hardness of the alloy. Molybdenum can make aluminum alloys produce a dense oxide film and improve the corrosion resistance of aluminum alloys. The addition of molybdenum can also improve the processing performance of aluminum alloys, reduce their work hardening rate and improve their processing stability; at high temperatures, molybdenum can also enhance the thermal stability of aluminum alloys.

[0027] Rare earth metal modification additives usually contain a variety of rare earth elements, which can act comprehensively on aluminum alloys to further refine grains, purify grain boundaries, and improve conductivity and heat resistance.

[0028] The invention prepares a rare earth metal modification auxiliary agent by mixing and grinding cerium nitrate and rubidium nitrate, dispersing the mixture in a graphene oxide solution, and then adding a silane coupling agent for treatment. The rare earth element in the rare earth metal modification auxiliary agent can refine the grains of the aluminum alloy, thereby improving the mechanical properties and heat resistance of the aluminum alloy.

[0029] The addition of rare earth elements can optimize the microstructure of aluminum alloys, reduce grain boundary scattering, and thus improve their conductivity. Rare earth elements can form stable Al-RE intermetallic compounds with aluminum. This compound can maintain good stability at high temperatures, thereby improving the heat resistance of aluminum alloys. Rare earth metal modification additives can also improve the processing properties of aluminum alloys, making it easier to perform processing operations such as wire drawing and stranding.

[0030] Rare earth elements have high chemical activity and can easily react with other elements in aluminum alloys to form stable compounds. These compounds can pin on the grain boundaries, hindering the movement of the grain boundaries, thereby refining the grains; the addition of rare earth elements can change the microstructure of aluminum alloys, making them more uniform and dense. This structural change can reduce the scattering of electrons at the grain boundaries, thereby improving the conductivity; at high temperatures, rare earth elements can form stable compounds, which can maintain good stability and are not easy to decompose or melt. Therefore, they can provide protection for aluminum alloys at high temperatures and improve their heat resistance.

[0031] In addition, graphene oxide and silane coupling agent in rare earth metal modification additives can improve the interface bonding between rare earth elements and aluminum alloy matrix, making it stronger. This strong interface bonding can improve the overall performance of aluminum alloy, including mechanical properties and heat resistance.

[0032] During the smelting process of aluminum alloy, oxygen, nitrogen, hydrogen and other gases will be absorbed, which will have an adverse effect on the performance of aluminum alloy, such as reducing conductivity, heat resistance and mechanical properties. The present invention further improves the performance of aluminum alloy by adding refining agent, which can react chemically with these gases to generate gas compounds, which will escape during the smelting process, thereby effectively removing the gas in the aluminum alloy; through refining treatment, the grains of aluminum alloy can be refined to make them more uniform and fine. Fine grains are conducive to improving the mechanical properties and processing properties of aluminum alloy, thereby improving the conductivity and heat resistance of aluminum alloy wire.

[0033] The sodium aluminate, sodium fluorosilicate and aluminum silicate in the refining agent of the present invention can react chemically with the gas and impurities in the aluminum alloy to generate gas compounds and oxides, fluorides and silicate precipitations. These compounds will escape or precipitate at the bottom of the melt during the smelting process, thereby achieving the removal of gas and impurities.

[0034] During the smelting process, the uniform distribution of alloy components is ensured by controlling the temperature of the aluminum liquid and the addition of alloying elements. The stirring and refining processes effectively remove impurities and gases in the alloy melt, thereby improving the purity and density of the alloy. The hot rolling and heat treatment processes further improve the microstructure and properties of the alloy, giving it better conductivity and heat resistance. The wire drawing process precisely controls the wire drawing speed and force to produce aluminum alloy single wires with uniform diameter and smooth surface.

[0035] Beneficial effects of the present invention:

[0036] (1) The present invention prepares a rare earth metal modification agent by mixing and grinding cerium nitrate and rubidium nitrate, dispersing them in a graphene oxide solution, and then adding a silane coupling agent for treatment. The rare earth element in the rare earth metal modification agent can refine the grains of the aluminum alloy, thereby improving its mechanical properties and heat resistance.

[0037] (2) The refining agent in the present invention is a mixture of sodium metaaluminate, sodium fluorosilicate and aluminum silicate in a mass ratio of 1:1:1. These components can react chemically with the gas and impurities in the aluminum alloy at high temperature to generate gas compounds and precipitates, and then remove non-metallic inclusions and tiny metal particles through slag removal. At the same time, the refining agent can also refine the grains of the aluminum alloy, improve its mechanical properties and processing properties, and thus improve the conductivity and heat resistance of the aluminum alloy wire. DETAILED DESCRIPTION

[0038] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0039] Raw material formula ratio 1: copper 0.5%, zirconium 0.3%, indium 0.1%, cobalt 0.1%, yttrium 0.1%, molybdenum 0.1%, rare earth metal modification additive 0.2%, refining agent 0.5%, aluminum ingot 98.1%;

[0040] Raw material formula ratio 2: copper 0.4%, zirconium 0.2%, indium 0.15%, cobalt 0.15%, yttrium 0.15%, molybdenum 0.15%, rare earth metal modification additive 0.3%, refining agent 0.3%, aluminum ingot 98.2%;

[0041] Raw material formula ratio 3: copper 0.6%, zirconium 0.3%, indium 0.05%, cobalt 0.05%, yttrium 0.05%, molybdenum 0.05%, rare earth metal modification additive 0.1%, refining agent 0.5%, aluminum ingot 98.3%;

[0042] Example 1

[0043] The preparation method of rare earth metal modified additive is as follows:

[0044] Cerium nitrate and rubidium nitrate were mixed in a mass ratio of 1:1, and ground in a ball mill at a speed of 400 r / min for 1 hour to obtain a mixture, and the mixture was dispersed in a graphene oxide solution with a mass fraction of 50%, and the mass ratio of the mixture to the graphene oxide solution was 1:1, and then 2wt% of silane coupling agent KH-560 was added, ultrasonicated for 0.5h, filtered, and dried at 110°C for 12h to obtain a rare earth metal modification additive;

[0045] The preparation method of the refining agent is as follows:

[0046] Sodium aluminate, sodium fluorosilicate and aluminum silicate are mixed in a mass ratio of 1:1:1, put into a ball mill for grinding, the ball mill speed is 500r / min, the grinding time is 1h, and sieved to obtain a refining agent with a particle size of 500 mesh;

[0047] The specific process of the method for preparing the high conductivity heat-resistant aluminum alloy wire is as follows:

[0048] S1: placing an aluminum ingot with a purity of ≥99.7% into a smelting furnace to melt to obtain aluminum liquid, the aluminum liquid temperature is 750°C, and copper, zirconium, indium, cobalt, yttrium, and molybdenum are added in sequence according to the formula ratio 1 to obtain a mixed alloy melt;

[0049] S2: The mixed alloy melt is fully stirred at a stirring rate of 300 r / min. After stirring for 2 hours, a rare earth metal modification agent is added to increase the stirring rate to 400 r / min and continue stirring. After stirring for 6 hours, a refining agent is added for refining at a refining temperature of 760°C. After refining, slag removal is performed, and a slag removal machine is used to remove the refined solid impurities. After slag removal, the melt is allowed to stand for 12 hours to obtain a refined mixed alloy melt;

[0050] S3: casting the refined mixed alloy melt into a continuous casting mold, performing a continuous casting operation to obtain an aluminum alloy ingot, hot rolling the aluminum alloy ingot at a rolling temperature of 560° C., and obtaining an aluminum alloy rod by continuous casting and rolling;

[0051] S4: The obtained aluminum alloy rod is further heat treated at a temperature of 500° C. for 30 hours. The heat treated aluminum alloy rod is placed in a wire drawing machine for wire drawing to be drawn into an aluminum alloy single wire with a diameter of 3.22 mm.

[0052] Example 2

[0053] The preparation method of rare earth metal modified additive is as follows:

[0054] Cerium nitrate and rubidium nitrate were mixed in a mass ratio of 1:1, and ground in a ball mill at a speed of 400 r / min for 1 hour to obtain a mixture, and the mixture was dispersed in a graphene oxide solution with a mass fraction of 50%, and the mass ratio of the mixture to the graphene oxide solution was 1:1, and then 2wt% of silane coupling agent KH-792 was added, ultrasonicated for 0.5h, filtered, and dried at 110°C for 12h to obtain a rare earth metal modification additive;

[0055] The preparation method of the refining agent is as follows:

[0056] Sodium aluminate, sodium fluorosilicate and aluminum silicate are mixed in a mass ratio of 1:1:1, put into a ball mill for grinding, the ball mill speed is 500r / min, the grinding time is 1h, and sieved to obtain a refining agent with a particle size of 500 mesh;

[0057] The specific process of the method for preparing the high conductivity heat-resistant aluminum alloy wire is as follows:

[0058] S1: placing an aluminum ingot with a purity of ≥99.7% into a smelting furnace to melt to obtain aluminum liquid, the aluminum liquid temperature is 720°C, and copper, zirconium, indium, cobalt, yttrium, and molybdenum are added in sequence according to the formula ratio 2 to obtain a mixed alloy melt;

[0059] S2: The mixed alloy melt is fully stirred at a stirring rate of 300 r / min. After stirring for 2 hours, a rare earth metal modification agent is added to increase the stirring rate to 400 r / min and continue stirring. After stirring for 6 hours, a refining agent is added for refining at a refining temperature of 740°C. After refining, slag removal is performed, and a slag removal machine is used to remove the refined solid impurities. After slag removal, the melt is allowed to stand for 12 hours to obtain a refined mixed alloy melt;

[0060] S3: casting the refined mixed alloy melt into a continuous casting mold, performing a continuous casting operation to obtain an aluminum alloy ingot, hot rolling the aluminum alloy ingot at a rolling temperature of 500° C., and obtaining an aluminum alloy rod by continuous casting and rolling;

[0061] S4: The obtained aluminum alloy rod is further heat treated at a temperature of 380° C. for 50 hours. The heat treated aluminum alloy rod is placed in a wire drawing machine for wire drawing to be drawn into an aluminum alloy single wire with a diameter of 3.22 mm.

[0062] Example 3

[0063] The preparation method of rare earth metal modified additive is as follows:

[0064] Cerium nitrate and rubidium nitrate were mixed in a mass ratio of 1:1, and ground in a ball mill at a speed of 400 r / min for 1 hour to obtain a mixture, and the mixture was dispersed in a graphene oxide solution with a mass fraction of 50%, and the mass ratio of the mixture to the graphene oxide solution was 1:1, and then 2wt% of silane coupling agent KH-792 was added, ultrasonicated for 0.5h, filtered, and dried at 110°C for 12h to obtain a rare earth metal modification additive;

[0065] The preparation method of the refining agent is as follows:

[0066] Sodium aluminate, sodium fluorosilicate and aluminum silicate are mixed in a mass ratio of 1:1:1, put into a ball mill for grinding, the ball mill speed is 500r / min, the grinding time is 1h, and sieved to obtain a refining agent with a particle size of 500 mesh;

[0067] The specific process of the method for preparing the high conductivity heat-resistant aluminum alloy wire is as follows:

[0068] S1: placing an aluminum ingot with a purity of ≥99.7% into a smelting furnace to melt to obtain aluminum liquid, the aluminum liquid temperature is 750°C, and copper, zirconium, indium, cobalt, yttrium, and molybdenum are added in sequence according to a formula ratio of 3 to obtain a mixed alloy melt;

[0069] S2: The mixed alloy melt is fully stirred at a stirring rate of 300 r / min. After stirring for 2 hours, a rare earth metal modification agent is added to increase the stirring rate to 400 r / min and continue stirring. After stirring for 6 hours, a refining agent is added for refining at a refining temperature of 740°C. After refining, slag removal is performed, and a slag removal machine is used to remove the refined solid impurities. After slag removal, the melt is allowed to stand for 12 hours to obtain a refined mixed alloy melt;

[0070] S3: casting the refined mixed alloy melt into a continuous casting mold, performing continuous casting operation to obtain an aluminum alloy ingot, hot rolling the aluminum alloy ingot at a rolling temperature of 530° C., and obtaining an aluminum alloy rod by continuous casting and rolling;

[0071] S4: The obtained aluminum alloy rod is further heat treated at a temperature of 450° C. for 40 hours. The heat treated aluminum alloy rod is placed in a wire drawing machine for wire drawing to be drawn into an aluminum alloy single wire having a diameter of 3.22 mm.

[0072] Comparative Example 1

[0073] In this comparative example, no rare earth metal modification agent is added, and the raw material formula ratio is 0.5% copper, 0.3% zirconium, 0.1% indium, 0.1% cobalt, 0.1% yttrium, 0.1% molybdenum, 0.5% refining agent, and 98.3% aluminum ingot. The remaining steps are consistent with Example 1.

[0074] Comparative Example 2

[0075] In this comparative example, graphene oxide and silane coupling agent KH-792 are not added during the preparation of the rare earth metal modification additive, and the remaining steps are consistent with Example 1.

[0076] Comparative Example 3

[0077] In this comparative example, no refining agent is added, and the formula ratio is 0.5% copper, 0.3% zirconium, 0.1% indium, 0.1% cobalt, 0.1% yttrium, 0.1% molybdenum, 0.2% rare earth metal modification agent, and 98.6% aluminum. No refining and slag removal treatment is performed during the preparation process, and the remaining steps are consistent with Example 1.

[0078] Comparative Example 4

[0079] In this comparative example, no sodium aluminate was added during the preparation of the refining agent, and the remaining steps were consistent with those of Example 1.

[0080] Comparative Example 5

[0081] In this comparative example, sodium fluorosilicate was not added during the preparation of the refining agent, and the remaining steps were consistent with those of Example 1.

[0082] Comparative Example 6

[0083] In this comparative example, aluminum silicate was not added during the preparation of the refining agent, and the remaining steps were consistent with those of Example 1.

[0084] Comparative Example 7

[0085] This comparative example does not undergo heat treatment during the preparation process, and the remaining steps are consistent with those of Example 1.

[0086] The conductivity, high temperature resistance and tensile strength of the embodiments and comparative examples were tested. The conductivity test was based on the standard GB / T 30551-2014, and the high temperature test was based on IEC 62004:2007. During the high temperature test, the sample was kept at 280°C for 12 hours to test its strength residual rate. The tensile strength test was based on IEC 62004:2007. The experimental results are summarized in the following table.

[0087]

[0088] Experimental data show that rare earth metal modification additives, refining agents and heat treatment during the preparation process have effectively improved the conductivity, high temperature resistance and tensile strength of aluminum alloy wires.

[0089] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a high-strength heat-resistant aluminum alloy wire, characterized in that: The raw materials of high conductivity heat-resistant aluminum alloy wire are as follows: by mass percentage, copper 0.4-0.6%, zirconium 0.2-0.3%, indium 0.05-0.15%, cobalt 0.05-0.15%, yttrium 0.05-0.15%, molybdenum 0.05-0.15%, rare earth metal modification additive 0.1-0.3%, refining agent 0.3-0.5%, and the balance is aluminum ingot. The preparation method of the rare earth metal modified additive is as follows: Cerium nitrate and rubidium nitrate were mixed in a mass ratio of 1:1, and ground in a ball mill at a speed of 400 r / min for 1 hour to obtain a mixture, and the mixture was dispersed in a graphene oxide solution with a mass fraction of 50%, and the mass ratio of the mixture to the graphene oxide solution was 1:1, and then 2wt% of a silane coupling agent was added, ultrasonicated for 0.5h, filtered, and dried at 110°C for 12h to obtain a rare earth metal modification additive; The specific process of the method for preparing the high conductivity heat-resistant aluminum alloy wire is as follows: S1: placing an aluminum ingot into a smelting furnace to melt and obtain aluminum liquid, the aluminum liquid temperature is 720-750°C, and copper, zirconium, indium, cobalt, yttrium, and molybdenum are added in sequence according to the formula ratio to obtain a mixed alloy melt; S2: The mixed alloy melt is fully stirred at a stirring rate of 300 r / min. After stirring for 2 hours, a rare earth metal modification agent is added to increase the stirring rate to 400 r / min and continue stirring. After stirring for 6 hours, a refining agent is added for refining at a refining temperature of 740-760°C. After refining, slag removal is performed, and a slag removal machine is used to remove the refined solid impurities. After slag removal, the melt is allowed to stand for 12 hours to obtain a refined mixed alloy melt; S3: casting the refined mixed alloy melt into a continuous casting mold, performing a continuous casting operation to obtain an aluminum alloy ingot, hot rolling the aluminum alloy ingot, and obtaining an aluminum alloy rod by continuous casting and rolling; S4: further heat-treating the obtained aluminum alloy rod material, placing the heat-treated aluminum alloy rod material into a wire drawing machine for wire drawing operation, drawing into aluminum alloy single wires, and twisting a plurality of aluminum alloy single wires to obtain the high conductivity heat-resistant aluminum alloy wire.

2. The method for preparing a high-strength heat-resistant aluminum alloy wire according to claim 1, characterized in that: The preparation method of the refining agent is as follows: Sodium aluminate, sodium fluorosilicate and aluminum silicate are mixed in a mass ratio of 1:1:1, put into a ball mill for grinding, the ball mill speed is 500r / min, the grinding time is 1h, and sieved to obtain a refining agent with a particle size of 500 mesh.

3. The method for preparing a high-strength heat-resistant aluminum alloy wire according to claim 1, characterized in that: The silane coupling agent is one of silane coupling agent KH-560 and silane coupling agent KH-792.

4. The method for preparing a high-strength heat-resistant aluminum alloy wire according to claim 1, characterized in that: The purity of the aluminum ingot in S1 is ≥99.7%.

5. The method for preparing a high-strength heat-resistant aluminum alloy wire according to claim 1, characterized in that: The hot rolling parameters in S3 are that the rolling temperature is 500-560°C.

6. The method for preparing a high-strength heat-resistant aluminum alloy wire according to claim 1, characterized in that: The heat treatment parameters in S4 are a heat treatment temperature of 380 to 500° C. and a time of 30 to 50 hours.

7. The method for preparing a high-strength heat-resistant aluminum alloy wire according to claim 1, characterized in that: The diameter of the aluminum alloy single wire obtained by wire drawing in S4 is 3.22 mm.

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