Vegetable high-conductivity heat-resistant aluminum alloy monofilament conductor material and preparation method thereof

Abstract

The invention relates to a vegetarized high-conductivity heat-resistant aluminum alloy monofilament conductor material, which comprises the following components and contents meeting the following requirements: 0.03-0.05% of Zr; 0.05% to 0.10% of Er; 0.05 to 0.3 percent of Si; 0.002% to 0.01% of B; (Cr + Mn + V + Ti) < = 0.005%, and the balance aluminum and inevitable trace impurities. The steps and contents in the preparation method of the'vegetarized 'high-conductivity heat-resistant aluminum alloy monofilament conductor material sequentially meet the following requirements: smelting; performing refining; purifying the melt; standing is performed; casting is conducted; carrying out homogenization treatment and rolling; wire drawing; and aging treatment. The high-conductivity and low-expansion-coefficient heat-resistant aluminum alloy monofilament conductor material for the overhead conductor has good mechanical-electric-thermal performance, the conductivity at the room temperature (20 DEG C) is larger than or equal to 61.5% IACS, the tensile strength is larger than or equal to 170 MPa, the thermal expansion coefficient is 20 * 10 <-6 > / DEG C, and the heat-resistant temperature reaches 150 DEG C. The high-conductivity and low-expansion-coefficient heat-resistant aluminum alloy monofilament conductor material is used for the overhead conductor. The method is excellent in comprehensive technical effect and has great potential economic value and social value.

Description

Technical Field

[0001] The present invention relates to the field of design and application technology of overhead wires for power transmission lines in the electric power industry, and in particular to a "plain" high-conductivity heat-resistant aluminum alloy single-filament conductor material and a preparation method thereof. Background Art

[0002] With the gradual construction of new power systems and the annual increase in power load, large-scale clean energy will face grid connection, transmission and consumption, which puts higher requirements on the transmission capacity, efficiency and reliability of overhead transmission lines. New conductors that can transmit large currents and operate reliably at higher temperatures are needed to support the improvement of the quality and efficiency of the power grid and ensure the grid connection and consumption of new energy.

[0003] Heat-resistant aluminum alloy conductors have the characteristics of high heat resistance and large transmission capacity. The maximum allowable operating temperature can reach above 150°C. Without replacing the pole towers and only replacing the conductors, the transmission capacity can be increased by 40% to 60% compared with the same specification of steel core aluminum stranded wire. It can effectively reduce the cost of line transformation and is suitable for new transmission lines, capacity expansion and transformation lines, and ultra-high voltage lines. At present, the mature heat-resistant aluminum alloy wire in China is NRLH1 type (heat resistance temperature 150°C, conductivity ≥ 60% IACS, tensile strength ≥ (159 ~ 169) MPa). The conductivity of related products at home and abroad is only 61% IACS at most, which is the same as ordinary steel core aluminum stranded wire, and the transmission loss is relatively high. In addition, the sag characteristics of the conductor are directly related to the safe and reliable operation of the line. The low thermal expansion coefficient of the material is the key. The current steel core (about 11×10 -6 / ℃) and aluminum wire (about 23×10 -6 / ℃), resulting in a large overall linear expansion coefficient of the conductor and poor sag characteristics. It is an urgent need to develop conductor materials with good heat resistance, excellent conductivity and low comprehensive linear expansion coefficient.

[0004] At present, the conductor material of heat-resistant aluminum alloy wires is mostly Al-Zr alloy. Zr, as the main alloying element, can form Al3Zr precipitation phase with good high-temperature stability with the aluminum matrix, thereby improving the heat resistance of the alloy. However, the diffusion rate of Zr in the aluminum matrix is ​​slow and the precipitation is uneven, which limits the precipitation strengthening effect and heat resistance optimization effect of the alloy. Research on aluminum alloy conductor materials with low thermal expansion coefficient has not yet been carried out, and its microscopic mechanism, alloy composition and preparation process control mechanism are still unclear. The research and development of a large number of high-performance heat-resistant aluminum alloy conductor materials mostly rely on the composite addition optimization of multiple alloying elements and rare earth elements. Excessive alloying increases the dependence on natural resources.

[0005] People are eager to obtain a "plain" high conductivity heat-resistant aluminum alloy single wire conductor material with excellent technical effect and its preparation method Summary of the invention

[0006] The present invention provides a "plain" high-conductivity heat-resistant aluminum alloy single-filament conductor material and a preparation method thereof. "Material plaining" refers to the manufacture of less-alloyed "plain" materials through cross-scale construction and organizational structure regulation, which greatly improves the comprehensive performance of the material and is a new idea for the design of new heat-resistant aluminum alloys. The electrical conductivity and heat resistance of Al-Zr alloys are closely related to their characteristic structures. By optimizing the composition formula and improving the preparation process, the best matching of the mechanical, electrical and thermal properties of Al-Zr alloys can be achieved. While ensuring high heat resistance temperature, the electrical conductivity is improved and the thermal expansion coefficient is reduced, solving the key technical problems that need to be solved in Al-Zr heat-resistant aluminum alloy conductor materials.

[0007] The purpose of the present invention is to develop an aluminum alloy monofilament conductor material with high conductivity, low thermal expansion coefficient and high heat resistance for overhead transmission lines in the power industry, so as to solve the technical problems of poor heat resistance of traditional steel core aluminum stranded wire and low conductivity of existing heat-resistant aluminum alloy wires. Based on the principle of material elementization, through defect control and phase structure regulation, a small amount of alloy element optimization is used to achieve a synergistic improvement in comprehensive performance.

[0008] The technical solution of the present invention is:

[0009] A "plain" high-conductivity heat-resistant aluminum alloy single-filament conductor material, the technical key of which is: the composition and content of the "plain" high-conductivity heat-resistant aluminum alloy single-filament conductor material meet the following requirements: Zr 0.03-0.05% (preferably 0.040-0.045%); Er 0.05-0.10% (preferably 0.05-0.08%); Si 0.05-0.3%; B 0.002-0.01%; (Cr+Mn+V+Ti)≤0.005%, and the remainder is aluminum and inevitable trace impurities.

[0010] The "plain" high conductivity heat-resistant aluminum alloy single wire conductor material of the present invention preferably requires the following technical contents to be protected:

[0011] The composition and content of the "plain" high conductivity heat-resistant aluminum alloy single wire conductor material meet the following requirements: Zr 0.040-0.045%; Er 0.05-0.08%; Si 0.05-0.3%; B 0.002-0.01%; (Cr+Mn+V+Ti)≤0.005%, and the remainder is aluminum and inevitable trace impurities.

[0012] The role and mechanism of each alloying element are as follows:

[0013] 1) Zr: Zirconium is one of the main alloying elements and can significantly affect the structure and properties of the alloy. Zirconium and aluminum matrix can form Al3Zr phase with L12 structure, which has the characteristics of good thermal stability, coherence with aluminum matrix and low lattice mismatch. However, the low diffusion rate of Zr makes the precipitation of Al3Zr phase slow and uneven. Although Zr is beneficial to improve the heat resistance of the alloy, the addition of excessive Zr will have a negative impact on the electrical conductivity. Therefore, accelerating the precipitation kinetics of Al3Zr, promoting the aging precipitation of Zr atoms, and improving the size and distribution of Al3Zr precipitated phase are the key to improving the performance of Al-Zr alloys.

[0014] 2) Er: Rare earth elements have the functions of purification, modification, refinement and microalloying. Rare earth elements improve the electrical conductivity of the alloy due to their low solubility in the aluminum matrix. At the same time, the intermetallic compounds formed by the eutectic reaction can increase the strength and thermal stability of the alloy. Er with a faster diffusion rate can first form the Al3Er phase as the nucleation site of Zr, accelerating the precipitation kinetics of zirconium. On the other hand, due to the addition of Er, the second phase distributed in the aluminum alloy increases, grain refinement is achieved, and the precipitation strengthening effect is increased, which is beneficial to improve the mechanical properties of the alloy.

[0015] 3) B: Reducing impurity elements helps to improve the conductivity of aluminum conductors. Boriding is an effective method to reduce the impurity content. Reasonable boriding can make the transition impurity elements in the ingot form borides and sink to the bottom of the furnace, reducing the content of Mn, Cr, V, and Ti impurity elements in the aluminum liquid, achieving the purpose of purification, and helping to improve the conductivity of aluminum alloys.

[0016] 4) Si: Adding an appropriate amount of Si element to the aluminum matrix can increase the primary silicon and eutectic silicon phases in the alloy, which is beneficial to reduce the thermal expansion coefficient of the alloy, thereby improving its stability in high temperature environments.

[0017] 5) V, Mn, Cr, Ti: These four elements are impurity elements in electrical pure aluminum. When Cr, Mn, V, and Ti impurity elements in aluminum exist in a solid solution state, they can easily absorb free electrons in the material and fill their incomplete electron layers. The reduction in the number of free electrons that play a conductive role will lead to an increase in the resistivity of the aluminum material. Studies have shown that the harmful effect of each 1% (Cr+Mn+V+Ti) impurity element on the conductivity of aluminum conductors is 5 times that of each 1% Si element. It can be seen that strictly controlling the content of Cr, Mn, V, and Ti impurity elements plays an important role in ensuring the conductivity of aluminum conductors.

[0018] The present invention also claims protection for the preparation method of the "plained" high-conductivity heat-resistant aluminum alloy single-filament conductor material, and the technical key is: the steps and contents in the preparation method of the "plained" high-conductivity heat-resistant aluminum alloy single-filament conductor material meet the following requirements:

[0019] Step 1, smelting: select industrial pure aluminum ingots for smelting, and keep the smelting temperature at 710-760°C; after the industrial pure aluminum ingots are completely melted, add Al-2% B master alloy for boronization treatment; then add Al-5% Zr master alloy, Al-10% Er master alloy, Al-Si master alloy and stir; after the master alloy is completely melted, electromagnetically stir the aluminum alloy liquid;

[0020] Step 2, refining: the temperature of the aluminum alloy solution is controlled in the range of 730-770° C., and an inert gas argon powder spray refining agent is introduced into the bottom of the aluminum alloy solution obtained in step 1, stirred, and then allowed to stand before slagging;

[0021] Step 3, melt purification: ultrasonic treatment of the melt to accelerate the separation of inclusions, reduce hydrogen concentration and pores, control potential defect risks, and improve melt purity;

[0022] Step 4, standing: evenly sprinkle a layer of covering agent on the aluminum melt, and keep it at 740-760°C;

[0023] Step 5, casting: the aluminum alloy liquid is poured into a casting mold at 745-765° C. to prepare an aluminum alloy ingot;

[0024] Step 6, homogenization and rolling: the aluminum alloy ingot obtained in step 5 is kept at 295-325° C. for 3-10 hours, then the temperature is increased to 475-505° C. at a heating rate of 50° C. / h, and the temperature is kept for 4-12 hours, then the temperature is increased to 490-620° C. at a heating rate of 50° C. / h, and the temperature is kept for 2-20 hours, then the temperature is reduced to 390-470° C., and then the aluminum alloy round rod is continuously rolled through a rolling mill;

[0025] Step 7, wire drawing: drawing the aluminum alloy round rod obtained in step 6 on a wire drawing machine to obtain a 3.84 mm aluminum alloy round monofilament;

[0026] Step 8: Aging treatment to finally obtain a high conductivity heat-resistant aluminum alloy single wire conductor material.

[0027] The method for preparing the "plained" high-conductivity heat-resistant aluminum alloy single-filament conductor material of the present invention preferably requires protection of the following technical content: the method for preparing the "plained" high-conductivity heat-resistant aluminum alloy single-filament conductor material meets the following requirements:

[0028] In step 1, during smelting, an industrial pure aluminum ingot with a purity requirement of ≥99.7% is selected, added into a smelting furnace for smelting, and the smelting temperature is maintained at 720-750° C.; after the industrial pure aluminum ingot is completely melted, Al-2% B master alloy is added at 720-730° C. for boronization treatment; after standing for 30 minutes, the master alloy is kept at 720-730° C., and Al-5% Zr master alloy, Al-10% Er master alloy, and Al-Si master alloy are added and stirred; after the master alloy is completely melted, the aluminum alloy liquid is electromagnetically stirred, each stirring is 10-15 minutes, a total of 3 times, and each stirring is 10-15 minutes apart; and the aluminum alloy liquid is obtained for standby use.

[0029] In step 2, the temperature of the aluminum alloy solution is controlled in the range of 740-760° C., and an inert gas argon with a gas purity of 99.99% is used as a powder spray refining agent to pass through the bottom of the aluminum alloy solution obtained in step 1. After ventilation for 10-15 minutes, the solution is stirred for 20 minutes, and then allowed to stand for 30 minutes before slagging. The amount of the refining agent added is approximately 0.25%-0.30% of the total amount of the charge.

[0030] In step 3, melt purification: the melt is subjected to ultrasonic treatment with an ultrasonic power of 150 to 220 W and a treatment time of 2 to 10 minutes to accelerate the separation of inclusions, reduce hydrogen concentration and pores, control potential defect risks, and improve melt purity;

[0031] Step 4, standing: sprinkle a layer of covering agent evenly on the aluminum melt, and keep it standing at a temperature of 740-760°C for not less than 30 minutes; set aside.

[0032] In step 5, during casting, the aluminum alloy liquid is first filtered through an alumina ceramic filter, and then cast into a ceramic mold at 750-760° C. to prepare an aluminum alloy ingot;

[0033] In step 6, the specific requirements for homogenization treatment and rolling are: the aluminum alloy ingot obtained in step 5 is kept at 300-320°C for 4-8h, the temperature is increased to 480-500°C at a heating rate of 50°C / h and kept for 6-10h, the temperature is increased to 500-600°C at a heating rate of 50°C / h and kept for 3-15h, the temperature is reduced to 400-450°C and continuously rolled into Ф9.5mm aluminum alloy round rods through a rolling mill.

[0034] In step 7, the wire drawing requirements are: the aluminum alloy round rod obtained in step 6 is drawn on a wire drawing machine at a speed of 6 to 8 m / s, and the wire drawing temperature is 40 to 45°C; and a special wire drawing oil and a nano mold are provided, and the aluminum alloy round monofilament with a diameter of 3.84 mm is obtained after 12 drawing passes;

[0035] In step 8, the requirements for aging treatment are: the aluminum alloy round monofilament obtained in step 7 is aged in a box-type heat treatment furnace for 4 to 6 hours, and the aging temperature is 170 to 220° C.; after the aging is completed, it is air-cooled to room temperature in the furnace to finally obtain a high conductivity heat-resistant aluminum alloy monofilament conductor material with a diameter of 3.84 mm.

[0036] The beneficial effects of the present invention are:

[0037] The raw material of the present invention adopts conventional industrial aluminum ingot (Al≥99.7%), and the content of zirconium (Zr), erbium (Er), boron (B), and silicon (Si) is controlled and optimized, and the microstructure of the aluminum alloy is adjusted through melt purification, three-stage aging treatment, high-temperature rolling, and cold drawing processes. The electrical conductivity at 20°C is 61.5% IACS, the tensile strength is 170MPa, the thermal expansion coefficient is 20×10 -6 / ℃;, the heat-resistant temperature reaches 150℃, that is, the maximum allowable continuous operating temperature reaches 150℃, which is a high conductivity, low thermal expansion heat-resistant aluminum alloy wire.

[0038] Since the present invention adds Zr, Er, Si and B elements to the aluminum alloy, it can reduce the impurity content of Cr, Mn, V, Ti and the like in the aluminum alloy to improve the electrical conductivity, accelerate the precipitation kinetics of the dominant element Zr to improve the heat resistance of the alloy, and improve the mechanical properties of the aluminum alloy through the dispersed aging precipitation phase, thereby ensuring that the aluminum alloy material has good mechanical-electrical-thermal properties.

[0039] The process of the present invention is characterized in that: firstly, smelting is performed, and when the industrial pure aluminum ingot is completely melted at 730°C to 750°C, Al-B master alloy is added at 720°C to 730°C for boronization treatment, and then Al-Zr, Al-Er and Al-Si master alloys are added at 720°C to 730°C, and the alloy elements are fully homogenized by stirring; a refining agent is used to remove hydrogen and slag from the aluminum liquid; ultrasonic treatment is used to purify the melt, control melt defects and improve melt quality; since the dissolution speed of Er atoms is faster than that of Zr atoms, a three-stage homogenization treatment process is used to make the alloy elements fully precipitate and react, and the first The first stage annealing first precipitates the Er element with a fast diffusion rate to form Al3Er phase, provides nucleation sites for Zr, and realizes the stable precipitation of Si element. Then the second stage homogenization treatment is carried out. The temperature is increased, the precipitation of eutectic silicon phase increases, the precipitation of Zr is accelerated, and it reacts with Al3Er phase. At the same time, it combines with impurity elements in the alloy to form (Al,Si)3(Er,Zr) composite phase. The precipitated phase is small in size and evenly distributed. Finally, the alloy is annealed for a longer time, which is conducive to the dissolution of solid solution Zr to form Al3Zr strengthening phase, effectively improving the thermal-electrical properties and anti-recrystallization ability of aluminum alloy. After homogenization treatment, the aluminum ingot is rolled into Aluminum alloy round rod; The aluminum alloy round rod is drawn on a wire drawing machine at a speed of 6 to 8 m / s and is obtained after 12 drawing passes. The aluminum alloy round monofilament is 100 mm in diameter. The obtained aluminum alloy round monofilament is heat treated in a box-type heat treatment furnace at an aging temperature of 170°C to 220°C for 4 to 6 hours, and air-cooled to room temperature after the aging is completed to obtain High conductivity super heat resistant aluminum alloy wire.

[0040] The present invention adds trace amounts of B and Er elements to the Al-Zr alloy, and through a two-stage homogenization treatment after casting and a heat treatment after drawing, the heat resistance of the aluminum alloy is improved while the electrical conductivity of the aluminum alloy is also guaranteed. Thus, a room temperature (20°C) electrical conductivity ≥ 61.5% IACS, a tensile strength ≥ 170 MPa, a thermal expansion coefficient of 20×10 -6 / ℃, high conductivity, low expansion coefficient heat-resistant aluminum alloy single wire conductor material for overhead wires with heat resistance temperature up to 150℃. DETAILED DESCRIPTION

[0041] The present invention will be further described below with reference to the embodiments, but is not limited thereto.

[0042] Example 1

[0043] The "plainized" high conductivity heat-resistant aluminum alloy single wire conductor material has the following composition and content meeting the following requirements: Zr 0.040-0.045%; Er 0.05-0.08%; Si 0.05-0.3%; B 0.002-0.01%; (Cr+Mn+V+Ti)≤0.005%, and the remainder is aluminum and inevitable trace impurities.

[0044] Example 2

[0045] The preparation method of "plain" high conductivity heat-resistant aluminum alloy single wire conductor material, the steps and contents of which meet the following requirements:

[0046] Step 1, smelting: select industrial pure aluminum ingots (purity ≥ 99.7%) and add them into a smelting furnace for smelting, and the smelting temperature is maintained at 720-750° C.; after the industrial pure aluminum ingot is completely melted, add Al-2% B master alloy at 720-730° C. for boronization treatment; after standing for 30 minutes, keep warm at 720-730° C., add Al-5% Zr master alloy, Al-10% Er master alloy, Al-Si master alloy and stir; after the master alloy is completely melted, electromagnetically stir the aluminum alloy liquid, stir for 10-15 minutes each time, for a total of 3 times, with an interval of 10-15 minutes each time;

[0047] Step 2, refining: the temperature of the aluminum alloy solution is controlled in the range of 740-760°C, and an inert gas argon (gas purity is 99.99%) is used to spray a powder refining agent into the bottom of the aluminum alloy liquid obtained in step 1. After ventilation for 10-15 minutes, stir for 20 minutes, and then stand for 30 minutes before slagging; the amount of refining agent added is about 0.25%-0.30% of the total amount of the charge;

[0048] Step 3, melt purification: ultrasonic treatment of the melt, with an ultrasonic power of 150-220W and a treatment time of 2-10min, to accelerate the separation of inclusions, reduce hydrogen concentration and pores, control potential defect risks, and improve melt purity;

[0049] Step 4, standing: evenly sprinkle a layer of covering agent on the aluminum melt, and keep it at a temperature of 740-760°C for not less than 30 minutes;

[0050] Step 5, casting: After filtering the aluminum alloy liquid through an alumina ceramic filter screen, the aluminum alloy liquid is cast into a ceramic mold at 750-760° C. to prepare an aluminum alloy ingot;

[0051] Step 6, homogenization and rolling: the aluminum alloy ingot obtained in step 5 is kept at 300-320° C. for 4-8 hours, then the temperature is increased to 480-500° C. at a heating rate of 50° C. / h and kept at that temperature for 6-10 hours, then the temperature is increased to 500-600° C. at a heating rate of 50° C. / h and kept at that temperature for 3-15 hours, then the temperature is reduced to 400-450° C. and continuously rolled into a 9.5 mm aluminum alloy round bar through a rolling mill;

[0052] Step 7, wire drawing: the aluminum alloy round rod obtained in step 6 is drawn on a wire drawing machine at a speed of 6-8 m / s, and the wire drawing temperature is 40-45° C.; and a special wire drawing oil and a nano mold are provided, and the drawing is performed 12 times to obtain a 3.84 mm aluminum alloy round monofilament;

[0053] Step 8, aging treatment: subjecting the aluminum alloy round monofilament obtained in step 7 to aging treatment in a box-type heat treatment furnace for 4 to 6 hours at an aging temperature of 170 to 220° C.; after aging, air-cooling the furnace to room temperature to finally obtain a high conductivity heat-resistant aluminum alloy monofilament conductor material with a diameter of 3.84 mm.

[0054] Examples 3 to 8 all use existing smelting, filtering, casting, rolling, wire drawing and aging treatment equipment, and are carried out according to the steps described in Example 2:

[0055] Table 1 Composition of aluminum alloy monofilament materials prepared in Example (wt.%)

[0056] Group Zr Er B Si Cr+Mn+V+Ti Al Example 3 0.03 0.10 0.002 0.08 0.004 margin Example 4 0.04 0.05 0.005 0.1 0.004 margin Example 5 0.04 0.10 0.01 0.15 0.003 margin Example 6 0.045 0.08 0.005 0.2 0.003 margin Example 7 0.05 0.08 0.002 0.2 0.004 margin Example 8 0.05 0.10 0.008 0.3 0.003 margin

[0057] Table 2 Performance test results of aluminum alloy monofilament prepared in Example

[0058]

[0059] As shown in Table 2, the comprehensive performance of the heat-resistant aluminum alloy single wire conductor material with high conductivity and low thermal expansion coefficient of the present invention has obvious advantages, especially the room temperature (20°C) conductivity ≥ 61.5% IACS, room temperature tensile strength 170 MPa, thermal expansion coefficient 20×10 -6 / ℃, heat-resistant temperature up to 150℃.

Claims

1. "Plain" high conductivity heat-resistant aluminum alloy single wire conductor material, characterized by: The composition and content of the "plain" high conductivity heat-resistant aluminum alloy single wire conductor material meet the following requirements: Zr 0.03-0.05%; Er 0.05-0.10%; Si 0.05-0.3%; B 0.002-0.01%; (Cr+Mn+V+Ti)≤0.005%, and the remainder is aluminum and inevitable trace impurities.

2. The "plain" high conductivity heat-resistant aluminum alloy single wire conductor material according to claim 1, characterized in that: The composition and content of the "plain" high conductivity heat-resistant aluminum alloy single wire conductor material meet the following requirements: Zr 0.040-0.045%; Er 0.05-0.08%; Si 0.05-0.3%; B 0.002-0.01%; (Cr+Mn+V+Ti)≤0.005%, and the remainder is aluminum and inevitable trace impurities.

3. The method for preparing the "plain" high conductivity heat-resistant aluminum alloy single wire conductor material according to claim 1, characterized in that: The steps and contents of the preparation method of the "plain" high conductivity heat-resistant aluminum alloy single wire conductor material meet the following requirements: Step 1, smelting: select industrial pure aluminum ingots for smelting, and keep the smelting temperature at 710-760°C; after the industrial pure aluminum ingots are completely melted, add Al-2% B master alloy for boronization treatment; then add Al-5% Zr master alloy, Al-10% Er master alloy, Al-Si master alloy and stir; after the master alloy is completely melted, electromagnetically stir the aluminum alloy liquid; Step 2, refining: the temperature of the aluminum alloy solution is controlled in the range of 730-770° C., and an inert gas argon powder spray refining agent is introduced into the bottom of the aluminum alloy solution obtained in step 1, stirred, and then allowed to stand before slagging; Step 3, melt purification: ultrasonic treatment of the melt to accelerate the separation of inclusions, reduce hydrogen concentration and pores, control potential defect risks, and improve melt purity; Step 4, standing: evenly sprinkle a layer of covering agent on the aluminum melt, and keep it warm and stand it; Step 5, casting: the aluminum alloy liquid is poured into a casting mold at 745-765° C. to prepare an aluminum alloy ingot; Step 6, homogenization and rolling: the aluminum alloy ingot obtained in step 5 is heated to 475-505° C. and kept at this temperature for 4-12 hours, then heated to 490-620° C. and kept at this temperature for 2-20 hours, then cooled to 390-470° C. and continuously rolled into aluminum alloy round rods through a rolling mill; Step 7, wire drawing: drawing the aluminum alloy round rod obtained in step 6 on a wire drawing machine to obtain an aluminum alloy round monofilament; Step 8: Aging treatment to finally obtain a high conductivity heat-resistant aluminum alloy single wire conductor material.

4. The method for preparing the "plain" high conductivity heat-resistant aluminum alloy single wire conductor material according to claim 3, characterized in that: The preparation method of the "plain" high conductivity heat-resistant aluminum alloy single wire conductor material meets the following requirements: In step 1, during smelting, an industrial pure aluminum ingot with a purity requirement of ≥99.7% is selected, added into a smelting furnace for smelting, and the smelting temperature is maintained at 720-750° C.; after the industrial pure aluminum ingot is completely melted, Al-2% B master alloy is added at 720-730° C. for boronization treatment; after standing for 30 minutes, the master alloy is kept at 720-730° C., and Al-5% Zr master alloy, Al-10% Er master alloy, and Al-Si master alloy are added and stirred; after the master alloy is completely melted, the aluminum alloy liquid is electromagnetically stirred, each stirring is 10-15 minutes, a total of 3 times, and each stirring is 10-15 minutes apart; and the aluminum alloy liquid is obtained for standby use.

5. The method for preparing the "plain" high conductivity heat-resistant aluminum alloy single wire conductor material according to claim 3 or 4, characterized in that: The preparation method of the "plain" high conductivity heat-resistant aluminum alloy single wire conductor material meets the following requirements: In step 2, the temperature of the aluminum alloy solution is controlled in the range of 740-760° C., and an inert gas argon with a gas purity of 99.99% is used as a powder spray refining agent to pass through the bottom of the aluminum alloy solution obtained in step 1. After ventilation for 10-15 minutes, the solution is stirred for 20 minutes, and then allowed to stand for 30 minutes before slagging. The amount of the refining agent added is approximately 0.25%-0.30% of the total amount of the charge. In step 3, melt purification: the melt is subjected to ultrasonic treatment with an ultrasonic power of 150 to 220 W and a treatment time of 2 to 10 minutes to accelerate the separation of inclusions, reduce hydrogen concentration and pores, control potential defect risks, and improve melt purity; Step 4, standing: sprinkle a layer of covering agent evenly on the aluminum melt, and keep it standing at a temperature of 740-760°C for not less than 30 minutes; set aside.

6. The method for preparing the "plain" high conductivity heat-resistant aluminum alloy single wire conductor material as claimed in claim 5, characterized in that: The preparation method of the "plain" high conductivity heat-resistant aluminum alloy single wire conductor material meets the following requirements: In step 5, during casting, the aluminum alloy liquid is first filtered through an alumina ceramic filter, and then cast into a ceramic mold at 750-760° C. to prepare an aluminum alloy ingot; In step 6, the specific requirements for homogenization treatment and rolling are: keep the aluminum alloy ingot obtained in step 5 at 300-320°C for 4-8h, increase the temperature to 480-500°C at a heating rate of 50°C / h and keep it for 6-10h, increase the temperature to 500-600°C at a heating rate of 50°C / h and keep it for 3-15h, then cool it to 400-450°C and continuously roll it into aluminum alloy round rods through a rolling mill.

7. The method for preparing the "plain" high conductivity heat-resistant aluminum alloy single wire conductor material according to claim 6, characterized in that: The preparation method of the "plain" high conductivity heat-resistant aluminum alloy single wire conductor material meets the following requirements: In step 7, the wire drawing requirements are: the aluminum alloy round rod obtained in step 6 is drawn on a wire drawing machine at a speed of 6 to 8 m / s, and the wire drawing temperature is 40 to 45° C.; and a special wire drawing oil and a nano mold are provided, and the aluminum alloy round monofilament is obtained after 12 drawing passes; In step 8, the requirements for aging treatment are: the aluminum alloy round monofilament obtained in step 7 is aged in a box-type heat treatment furnace for 4 to 6 hours, and the aging temperature is 170 to 220° C.; after the aging is completed, it is air-cooled to room temperature in the furnace to finally obtain a high conductivity heat-resistant aluminum alloy monofilament conductor material.

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