CN117587299A - High-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod and preparation method and application thereof - Google Patents
High-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod and preparation method and application thereof Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 201
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 49
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000012535 impurity Substances 0.000 claims abstract description 26
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 17
- 229910052691 Erbium Inorganic materials 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 99
- 239000000956 alloy Substances 0.000 claims description 65
- 229910045601 alloy Inorganic materials 0.000 claims description 63
- 238000003756 stirring Methods 0.000 claims description 42
- 238000007670 refining Methods 0.000 claims description 30
- 239000003795 chemical substances by application Substances 0.000 claims description 24
- 230000032683 aging Effects 0.000 claims description 23
- 229910018580 Al—Zr Inorganic materials 0.000 claims description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 238000003723 Smelting Methods 0.000 claims description 20
- 238000005096 rolling process Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 16
- 238000005266 casting Methods 0.000 claims description 16
- 238000005491 wire drawing Methods 0.000 claims description 14
- 229910010293 ceramic material Inorganic materials 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 239000011780 sodium chloride Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 7
- 229910052720 vanadium Inorganic materials 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000005275 alloying Methods 0.000 abstract description 5
- 239000004020 conductor Substances 0.000 abstract description 5
- 239000000654 additive Substances 0.000 abstract description 2
- 230000000996 additive effect Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 47
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 239000002893 slag Substances 0.000 description 12
- 238000001816 cooling Methods 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 9
- 229910052710 silicon Inorganic materials 0.000 description 9
- 238000001556 precipitation Methods 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 238000005273 aeration Methods 0.000 description 6
- 238000005271 boronizing Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000003574 free electron Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910001610 cryolite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
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- 239000010703 silicon Substances 0.000 description 1
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- 230000007704 transition Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
- B21C37/045—Manufacture of wire or bars with particular section or properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/023—Alloys based on aluminium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to the field of overhead conductors of transmission lines in the power industry, in particular to a high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire, a preparation method and application thereof. The invention provides a high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire, which comprises the following components in percentage by mass: 0.03 to 0.06 percent of Zr;0.05 to 0.15 percent of Er; 0.002-0.02% of B; fe is less than or equal to 0.1%; si is less than or equal to 0.05%; (Cr+Mn+V+Ti) is less than or equal to 0.005%, and the balance is aluminum and unavoidable trace impurities. According to the invention, by optimizing the additive elements of the aluminum alloy and adding alloying elements such as Zr, er, B and the like, and controlling the content of each alloying element such as Zr, er, B and the like, the aluminum alloy wire has high conductivity, high strength and high heat resistance.
Description
Technical Field
The invention relates to the field of overhead conductors of transmission lines in the power industry, in particular to a high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire, a preparation method and application thereof.
Background
With the construction of a novel power system, large-scale clean energy is connected, conveyed and consumed, and higher requirements are placed on the safe and efficient conveying capacity of a power transmission line, and a novel energy-saving wire which can convey large current and can run at a higher temperature is needed in the prior art so as to support the quality improvement and efficiency enhancement of a power grid and ensure new energy connection and consumption.
The heat-resistant aluminum alloy wire has the characteristics of high heat-resistant temperature and large conveying capacity, the highest allowable running temperature can reach more than 150 ℃, the conveying capacity can be improved by 40-60% compared with that of the steel-cored aluminum stranded wire with the same specification under the condition that a pole tower is not replaced and only the wire is replaced, the line transformation cost can be effectively reduced, and the heat-resistant aluminum alloy wire can be applied to the scenes of newly-built transmission lines, capacity-increasing transformation lines, extra-high voltage lines and the like. At present, the mature heat-resistant aluminum alloy wires in China mainly comprise NRLH1 type [ heat-resistant temperature 150 ℃, electric conductivity is more than or equal to 60% IACS, tensile strength is more than or equal to 159-169 MPa ], NRLH2 type [ heat-resistant temperature 150 ℃, electric conductivity is more than or equal to 55% IACS, tensile strength is more than or equal to 225-248 MPa ], and NRLH3 type [ heat-resistant temperature 210 ℃, electric conductivity is 60% IACS, and tensile strength is more than or equal to 159-176 MPa ]. For the super heat-resistant aluminum alloy wire with the heat-resistant temperature reaching 210 ℃, the conductivity of related products at home and abroad is only 60 percent IACS, which is lower than that of a common steel-cored aluminum strand by 1 percent IACS, and the power transmission loss is high, so that the popularization and the application of the super heat-resistant aluminum alloy wire in overhead power transmission lines are severely restricted.
At present, the conductor material of the heat-resistant aluminum alloy wire mostly adopts Al-Zr series alloy, zr is taken as a main alloy element, and can form an Al3Zr precipitated phase with good high temperature stability with aluminum base, thereby improving the heat resistance of the alloy. However, zr in the aluminum matrix has slow diffusion speed and uneven precipitation, and limits the precipitation strengthening effect and the heat resistance optimizing effect of the alloy. In summary, it is difficult to achieve high conductivity, high strength and high heat resistance of the aluminum alloy wire prepared from the conventional Al-Zr alloy.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the aluminum alloy wire prepared from the conventional Al-Zr alloy is difficult to achieve high conductivity, high strength and high heat resistance, so as to provide the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire, and the preparation method and application thereof.
The invention provides a high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire, which comprises the following components in percentage by mass: 0.03 to 0.06 percent of Zr;0.05 to 0.15 percent of Er; 0.002-0.02% of B; fe is less than or equal to 0.1%; si is less than or equal to 0.05%; (Cr+Mn+V+Ti) is less than or equal to 0.005%, and the balance is aluminum and unavoidable trace impurities.
Preferably, the Zr content is 0.045-0.050%;
preferably, the content of Er is 0.05-0.1%.
Preferably, the conductivity of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire is more than or equal to 61.5% IACS, the tensile strength is more than or equal to 169MPa, and the maximum allowable continuous operation temperature reaches 210 ℃.
The action and mechanism of each alloy element are as follows:
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 are capable of forming a film having L1 2 Structural Al 3 The Zr phase has the characteristics of good thermal stability, coherent aluminum matrix and low lattice mismatch degree. But the low diffusion rate of Zr is such that Al 3 The precipitation of Zr phase is slow and uneven, and although Zr is beneficial to improving the heat resistance of the alloy, the addition of excessive Zr can negatively affect the conductivity. Thus, al is accelerated 3 Kinetics of Zr precipitation, promoting aging precipitation of Zr atoms and improving Al 3 The size and distribution of Zr precipitated phases become the key for improving the performance of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire.
2) Er: the rare earth element has the functions of purification, modification, refinement and microalloying, the conductivity of the alloy is improved due to the low solubility of the rare earth element in an aluminum matrix, and meanwhile, the intermetallic compound formed by eutectic reaction can increase the strength and the thermal stability of the alloy. The Er with higher diffusion speed can form an Al3Er phase as a nucleation site of Zr so as to accelerate the precipitation kinetics of zirconium. On the other hand, due to the addition of Er, the second phases distributed in the aluminum alloy are increased, so that grain refinement is realized, the precipitation strengthening effect is increased, and the mechanical property of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire is improved.
3) B: the reduction of impurity elements is helpful for improving the conductivity of an aluminum conductor, the boride treatment is an effective method for reducing the impurity content, the reasonable boride treatment can enable transition impurity elements in the cast ingot to form boride to sink to the bottom of the furnace, the content of Mn, cr, V, ti impurity elements in the aluminum liquid is reduced, the purification purpose is achieved, and the improvement of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod gold conductivity is facilitated.
4) Fe, si: fe. Si is a major impurity in high purity aluminum and typically forms an AlFeSi impurity phase. The addition of a proper amount of Fe and Si elements can effectively refine grains, the primary phase is obviously increased and the crystal boundary is in a continuous irregular shape, but the content of iron and silicon needs to be strictly controlled.
5) V, mn, cr, ti: all the four elements are impurity elements in the electrical pure aluminum, when Cr, mn, V, ti impurity elements in the aluminum material exist in a solid solution state, free electrons in the material are easily absorbed to fill an incomplete electron layer, and the reduction of the number of free electrons with a conductive effect can lead to the increase of the resistivity of the aluminum material. Studies have shown that every 1% (Cr+Mn+V+Ti) impurity element has a 5-fold detrimental effect on the conductivity of aluminum conductors compared to every 1% Si element. Therefore, the content of Cr, mn, V, ti impurity elements is strictly controlled, and the method plays an important role in the conductivity of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire.
The invention also provides a preparation method of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod, which comprises the following steps:
1) Smelting raw materials according to a formula proportion to obtain an aluminum alloy solution;
2) Refining, standing and casting the aluminum alloy solution to obtain an aluminum alloy cast ingot;
3) Performing heat treatment on the aluminum alloy cast ingot and then rolling to obtain an aluminum alloy round rod;
4) Drawing and aging the aluminum alloy round rod to obtain the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod;
the method comprises the steps of carrying out heat treatment on an aluminum alloy ingot, wherein the step of carrying out heat treatment on the aluminum alloy ingot comprises the steps of sequentially carrying out first heat treatment, second heat treatment and third heat treatment; the temperature of the first heat treatment is 300-320 ℃; the temperature of the second heat treatment is 480-500 ℃; the temperature of the third heat treatment is 500-600 ℃.
Preferably, the time of the first heat treatment is 8-10 h, the time of the second heat treatment is 8-10 h, and the time of the third heat treatment is 3-15 h; and/or the number of the groups of groups,
the temperature in the rolling step is 400-450 ℃; and/or the number of the groups of groups,
the diameter of the rolled aluminum alloy round rod is 8-12mm; and/or the number of the groups of groups,
the wire drawing speed in the wire drawing step is 6-8 m/s, the wire drawing temperature is 40-50 ℃, the single-pass deformation is 5-8%, and the diameter of the aluminum alloy wire obtained after wire drawing is 3.5-4mm; and/or the number of the groups of groups,
the aging temperature in the aging treatment step is 200-220 ℃, and the aging time is 4-6 h.
Preferably, the smelting process in step 1) comprises the steps of: smelting an industrial aluminum ingot at 730-750 ℃, adding an Al-B intermediate alloy at 720-730 ℃, stirring, standing for 20-30min, adding an Al-Zr intermediate alloy and an Al-Er intermediate alloy at 720-730 ℃, stirring, and stirring for 2-3 times after all alloy materials are melted, wherein the stirring time is 10-15 min each time, and the stirring interval time is 10-15 min each time.
Preferably, the content of Al in the industrial aluminum ingot is 99.7-99.8 wt%, the content of Fe is less than or equal to 0.085wt%, the content of Si is less than or equal to 0.036wt%, and the total content of Cr, mn, V and Ti is less than or equal to 0.009wt%;
the content of B in the Al-B intermediate alloy is 2-3wt%, the content of Zr in the Al-Zr intermediate alloy is 4-6wt%, and the content of Er in the Al-Er intermediate alloy is 8-12wt%.
Preferably, the refining step in step 2) includes: controlling the temperature of the aluminum alloy solution to 740-760 ℃, then introducing nitrogen and a refining agent into the solution, after 10-15 min of ventilation, stirring for 15-20 min, and then standing for 20-30min, and slagging off to obtain a refined aluminum alloy solution; and/or the number of the groups of groups,
the casting step is to cast the aluminum alloy solution into a ceramic material mold; and/or the number of the groups of groups,
the method further comprises the step of preheating the ceramic material die before casting, wherein the preheating temperature is 750-760 ℃; and/or the number of the groups of groups,
the method further comprises the step of filtering the refined aluminum alloy solution before the casting step.
Preferably, the purity of the nitrogen is not less than 99.99%, and the adding amount of the refining agent is 0.25% -0.30% of the weight of the aluminum alloy solution.
Preferably, the refining agent comprises the following components in percentage by mass: 25-30% NaCl, 10-15% KCl, 40-50% NaF and 5-15% Na3AlF6.
Preferably, the step of heat-treating the aluminum alloy ingot comprises the steps of heating the aluminum alloy ingot to a second heat treatment temperature at a heating rate of 40-60 ℃/h after the first heat treatment is completed, performing the second heat treatment, and heating the aluminum alloy ingot to a third heat treatment temperature at a heating rate of 40-60 ℃/h after the second heat treatment is completed, performing the third heat treatment.
The invention also provides a power transmission wire, which comprises the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod or the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod prepared by the preparation method.
The technical scheme of the invention has the following advantages:
1. the invention provides a high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire, which comprises the following components in percentage by mass: 0.03 to 0.06 percent of Zr;0.05 to 0.15 percent of Er; 0.002-0.02% of B; fe is less than or equal to 0.1%; si is less than or equal to 0.05%; (Cr+Mn+V+Ti) is less than or equal to 0.005%, and the balance is aluminum and unavoidable trace impurities.
According to the invention, by optimizing the additive elements of the aluminum alloy and adding alloying elements such as Zr, er, B and the like, and controlling the content of each alloying element such as Zr, er, B and the like, the aluminum alloy wire has high conductivity, high strength and high heat resistance.
2. The invention provides a preparation method of a high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod, which comprises the following steps: 1) Smelting raw materials according to a formula proportion to obtain an aluminum alloy solution; 2) Refining, standing and casting the aluminum alloy solution to obtain an aluminum alloy cast ingot; 3) Performing heat treatment on the aluminum alloy cast ingot and then rolling to obtain an aluminum alloy round rod; 4) Drawing and aging the aluminum alloy round rod to obtain the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod; wherein, the step of heat treatment of the aluminum alloy ingot comprises a first heat treatment, a second heat treatment and a third heat treatment; the temperature of the first heat treatment is 300-320 ℃; the temperature of the second heat treatment is 480-500 ℃; the temperature of the third heat treatment is 500-600 ℃.
The aluminum alloy solution obtained by smelting raw materials according to the formula proportion is subjected to refining, standing, casting and rolling to obtain an aluminum alloy round rod, and then is subjected to first heat treatment at 300-320 ℃ to precipitate Er element with high diffusion speed to form Al 3 An Er phase, thereby providing nucleation sites for Zr in the matrix; then carrying out a second heat treatment at 480-500 ℃ to separate out Zr from the matrix and the Zr is mixed with Al 3 The Er phase reacts and combines with Si element in the matrix to form (Al, si) 3 (Er, zr) composite phases of small size and uniformly distributed; then carrying out third heat treatment at 500-600 ℃ to further promote precipitation, desolventization and strengthening of Zr and form Al 3 Zr phase, forming a composite structure of coherent thermal stable phase and strengthening phase, so that the overall heat resistance of the alloy reaches the level of super heat resistance, and simultaneously, high strength and conductivity of the aluminum alloy are ensured, finally, the aluminum alloy round bar is subjected to wire drawing and aging treatment, and finally, the obtained aluminum alloy wire has high strength and high conductivity heat resistance.
Detailed Description
The following examples are provided for a better understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention, any product which is the same or similar to the present invention, whether in light of the present teachings or in combination with other prior art features, falls within the scope of the present invention.
The specific experimental procedures or conditions are not noted in the examples and may be followed by the operations or conditions of conventional experimental procedures described in the literature in this field. The reagents or apparatus used were conventional reagent products commercially available without the manufacturer's knowledge.
The composition of the industrial aluminum ingots used in the examples and comparative examples was that the content of Al in the industrial aluminum ingot was 99.7wt%, the content of Fe was 0.085wt% or less, the content of Si was 0.036wt% or less, and the total content of Cr, mn, V and Ti was 0.009wt% or less;
the content of B in the Al-B master alloy is 2wt%;
the content of Zr in the Al-Zr intermediate alloy is 5wt%;
the content of Er in the Al-Er intermediate alloy is 10wt%.
Example 1
The embodiment provides a high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire, which comprises the following components in percentage by mass: 0.045% Zr;0.10% Er;0.020% B;0.010% Fe;0.043% Si;0.004% (Cr+Mn+V+Ti), the balance being aluminum and unavoidable trace impurities.
The embodiment also provides a preparation method of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod, which comprises the following steps: preparing an industrial aluminum ingot, an Al-B intermediate alloy, an Al-Zr intermediate alloy and an Al-Er intermediate alloy according to the components of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire; smelting an industrial aluminum ingot in a smelting furnace at 730 ℃, adding an Al-B intermediate alloy for boronizing treatment after the industrial aluminum ingot is completely melted, stirring uniformly, adding an Al-Zr intermediate alloy and an Al-Er intermediate alloy for stirring at 720 ℃, stirring for 3 times after all raw materials are completely melted, wherein the stirring time is 10min each time, and the stirring interval time is 10min each time, so as to obtain an aluminum alloy solution; the temperature of the aluminum alloy solution is controlled to 740 ℃, high-purity nitrogen with the purity of 99.99 percent and a refining agent (the amount of the refining agent is 0.3 percent of that of the aluminum alloy solution) are introduced into the bottom of the aluminum alloy solution, wherein the refining agent comprises the following components of 30 percent of NaCl, 15 percent of KCl, 40 percent of NaF and 15 percent of Na 3 AlF 6 ) The aeration time is 15min, the mixture is stirred for 20min and then is kept stand for 30min, and then slag is removed; filtering and removing impurities from the aluminum alloy solution after slag skimming, and casting the filtered aluminum alloy solution in a ceramic material mold preheated at 750 ℃ to prepare an aluminum alloy cast ingot with the size of 25 multiplied by 400 mm; then carrying out heat treatment on an aluminum alloy ingot at 310 ℃ for 9 hours, then heating to 490 ℃ at a heating rate of 50 ℃/h, carrying out heat treatment at the temperature for 9 hours, then heating to 550 ℃ at a heating rate of 50 ℃/h, carrying out heat treatment for 12 hours, cooling to 400 ℃ after the heat treatment is finished, and continuously rolling into an aluminum alloy round rod with the diameter of 9.5mm by a rolling mill; the round rod of aluminum alloy is heated to 40 ℃ at a speed of 6m/sDrawing the aluminum alloy round rod on a drawing machine for multiple times until the deformation of the single drawing pass is 8 percent and the aluminum alloy round rod becomes an aluminum alloy round monofilament with the diameter of 3.84 mm; aging the aluminum alloy round monofilaments in a box-type heat treatment furnace with the temperature of 210 ℃ for 5 hours, and air-cooling the aluminum alloy round monofilaments to room temperature after aging is finished to obtain the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire.
Example 2
The embodiment provides a high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire, which comprises the following components in percentage by mass: 0.045% Zr;0.05% Er;0.015% B;0.093% Fe;0.046% Si;0.004% (Cr+Mn+V+Ti), the balance being aluminum and unavoidable trace impurities.
The embodiment also provides a preparation method of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod, which comprises the following steps: preparing an industrial aluminum ingot, an Al-B intermediate alloy, an Al-Zr intermediate alloy and an Al-Er intermediate alloy according to the components of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire; smelting an industrial aluminum ingot in a smelting furnace at 730 ℃, adding an Al-B intermediate alloy for boronizing treatment after the industrial aluminum ingot is completely melted, stirring uniformly, adding an Al-Zr intermediate alloy and an Al-Er intermediate alloy for stirring at 720 ℃, stirring for 3 times after all raw materials are completely melted, wherein the stirring time is 10min each time, and the stirring interval time is 10min each time, so as to obtain an aluminum alloy solution; the temperature of the aluminum alloy solution is controlled to 740 ℃, high-purity nitrogen with the purity of 99.99 percent and a refining agent (the amount of the refining agent is 0.3 percent of that of the aluminum alloy solution) are introduced into the bottom of the aluminum alloy solution, wherein the refining agent comprises the following components of 30 percent of NaCl, 15 percent of KCl, 40 percent of NaF and 15 percent of Na 3 AlF 6 ) The aeration time is 15min, the mixture is stirred for 20min and then is kept stand for 30min, and then slag is removed; filtering and removing impurities from the aluminum alloy solution after slag skimming, and casting the filtered aluminum alloy solution in a ceramic material mold preheated at 750 ℃ to prepare an aluminum alloy cast ingot with the size of 25 multiplied by 400 mm; then the aluminum alloy ingot is heat treated for 9 hours at 310 ℃, then the temperature is raised to 490 ℃ at the heating rate of 50 ℃/h, the heat treatment is carried out for 9 hours at the temperature, then the temperature is raised to 550 ℃ at the heating rate of 50 ℃/h, the heat treatment is carried out for 12 hours, the heat treatment is carried outCooling to 400 ℃ after the treatment is finished, and continuously rolling into an aluminum alloy round rod with the diameter of 9.5mm by a rolling mill; carrying out multi-pass drawing on the aluminum alloy round rod on a wire drawing machine at the temperature of 40 ℃ at the speed of 6m/s, wherein the deformation of a single drawing pass is 8 percent, until the aluminum alloy round rod becomes an aluminum alloy round monofilament with the diameter of 3.84 mm; aging the aluminum alloy round monofilaments in a box-type heat treatment furnace with the temperature of 210 ℃ for 5 hours, and air-cooling the aluminum alloy round monofilaments to room temperature after aging is finished to obtain the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire.
Example 3
The embodiment provides a high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire, which comprises the following components in percentage by mass: 0.05% Zr;0.10% Er;0.015% B;0.080% Fe;0.040% Si;0.003% of (Cr+Mn+V+Ti), the balance being aluminum and unavoidable trace impurities.
The embodiment also provides a preparation method of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod, which comprises the following steps: preparing an industrial aluminum ingot, an Al-B intermediate alloy, an Al-Zr intermediate alloy and an Al-Er intermediate alloy according to the components of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire; smelting an industrial aluminum ingot in a smelting furnace at 730 ℃, adding an Al-B intermediate alloy for boronizing treatment after the industrial aluminum ingot is completely melted, stirring uniformly, adding an Al-Zr intermediate alloy and an Al-Er intermediate alloy for stirring at 720 ℃, stirring for 3 times after all raw materials are completely melted, wherein the stirring time is 10min each time, and the stirring interval time is 10min each time, so as to obtain an aluminum alloy solution; the temperature of the aluminum alloy solution is controlled to 740 ℃, high-purity nitrogen with the purity of 99.99 percent and a refining agent (the amount of the refining agent is 0.3 percent of that of the aluminum alloy solution) are introduced into the bottom of the aluminum alloy solution, wherein the refining agent comprises the following components of 30 percent of NaCl, 15 percent of KCl, 40 percent of NaF and 15 percent of Na 3 AlF 6 ) The aeration time is 15min, the mixture is stirred for 20min and then is kept stand for 30min, and then slag is removed; filtering and removing impurities from the aluminum alloy solution after slag skimming, and casting the filtered aluminum alloy solution in a ceramic material mold preheated at 750 ℃ to prepare an aluminum alloy cast ingot with the size of 25 multiplied by 400 mm; then the aluminum alloy ingot is heat treated for 9 hours at 310 ℃, and then the temperature rises at 50 ℃/hHeating to 490 ℃ at a temperature rate, performing heat treatment for 9 hours at the temperature, heating to 550 ℃ at a heating rate of 50 ℃/h, performing heat treatment for 12 hours, cooling to 400 ℃ after the heat treatment is finished, and continuously rolling into an aluminum alloy round rod with the diameter of 9.5mm by a rolling mill; carrying out multi-pass drawing on the aluminum alloy round rod on a wire drawing machine at the temperature of 40 ℃ at the speed of 6m/s, wherein the deformation of a single drawing pass is 8 percent, until the aluminum alloy round rod becomes an aluminum alloy round monofilament with the diameter of 3.84 mm; aging the aluminum alloy round monofilaments in a box-type heat treatment furnace with the temperature of 210 ℃ for 5 hours, and air-cooling the aluminum alloy round monofilaments to room temperature after aging is finished to obtain the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire.
Example 4
The embodiment provides a high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire, which comprises the following components in percentage by mass: 0.05% Zr;0.15% Er;0.016% of B;0.092% Fe;0.040% Si;0.003% of (Cr+Mn+V+Ti), the balance being aluminum and unavoidable trace impurities.
The embodiment also provides a preparation method of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod, which comprises the following steps: preparing an industrial aluminum ingot, an Al-B intermediate alloy, an Al-Zr intermediate alloy and an Al-Er intermediate alloy according to the components of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire; smelting an industrial aluminum ingot in a smelting furnace at 730 ℃, adding an Al-B intermediate alloy for boronizing treatment after the industrial aluminum ingot is completely melted, stirring uniformly, adding an Al-Zr intermediate alloy and an Al-Er intermediate alloy for stirring at 720 ℃, stirring for 3 times after all raw materials are completely melted, wherein the stirring time is 10min each time, and the stirring interval time is 10min each time, so as to obtain an aluminum alloy solution; the temperature of the aluminum alloy solution is controlled to 740 ℃, high-purity nitrogen with the purity of 99.99 percent and a refining agent (the amount of the refining agent is 0.3 percent of that of the aluminum alloy solution) are introduced into the bottom of the aluminum alloy solution, wherein the refining agent comprises the following components of 30 percent of NaCl, 15 percent of KCl, 40 percent of NaF and 15 percent of Na 3 AlF 6 ) The aeration time is 15min, the mixture is stirred for 20min and then is kept stand for 30min, and then slag is removed; filtering and removing impurities from the aluminum alloy solution after slag skimming, casting the filtered aluminum alloy solution in a ceramic material mold preheated at 750 DEG CPreparing an aluminum alloy cast ingot with the size of 25 multiplied by 400 mm; then carrying out heat treatment on an aluminum alloy ingot at 310 ℃ for 9 hours, then heating to 490 ℃ at a heating rate of 50 ℃/h, carrying out heat treatment at the temperature for 9 hours, then heating to 550 ℃ at a heating rate of 50 ℃/h, carrying out heat treatment for 12 hours, cooling to 400 ℃ after the heat treatment is finished, and continuously rolling into an aluminum alloy round rod with the diameter of 9.5mm by a rolling mill; carrying out multi-pass drawing on the aluminum alloy round rod on a wire drawing machine at the temperature of 40 ℃ at the speed of 6m/s, wherein the deformation of a single drawing pass is 8 percent, until the aluminum alloy round rod becomes an aluminum alloy round monofilament with the diameter of 3.84 mm; aging the aluminum alloy round monofilaments in a box-type heat treatment furnace with the temperature of 210 ℃ for 5 hours, and air-cooling the aluminum alloy round monofilaments to room temperature after aging is finished to obtain the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire.
Example 5
The embodiment provides a high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire, which comprises the following components in percentage by mass: 0.06% Zr;0.15% Er;0.010% B;0.095% Fe;0.043% Si;0.004% (Cr+Mn+V+Ti), the balance being aluminum and unavoidable trace impurities.
The embodiment also provides a preparation method of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod, which comprises the following steps: preparing an industrial aluminum ingot, an Al-B intermediate alloy, an Al-Zr intermediate alloy and an Al-Er intermediate alloy according to the components of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire; smelting an industrial aluminum ingot in a smelting furnace at 730 ℃, adding an Al-B intermediate alloy for boronizing treatment after the industrial aluminum ingot is completely melted, stirring uniformly, adding an Al-Zr intermediate alloy and an Al-Er intermediate alloy for stirring at 720 ℃, stirring for 3 times after all raw materials are completely melted, wherein the stirring time is 10min each time, and the stirring interval time is 10min each time, so as to obtain an aluminum alloy solution; the temperature of the aluminum alloy solution is controlled to 740 ℃, high-purity nitrogen with the purity of 99.99 percent and a refining agent (the amount of the refining agent is 0.3 percent of that of the aluminum alloy solution) are introduced into the bottom of the aluminum alloy solution, wherein the refining agent comprises the following components of 30 percent of NaCl, 15 percent of KCl, 40 percent of NaF and 15 percent of Na 3 AlF 6 ) The aeration time is 15min, the mixture is stirred for 20min and then is kept stand for 30min, and then slag is removed; will beFiltering and removing impurities from the aluminum alloy solution after slag skimming, and casting the filtered aluminum alloy solution in a ceramic material mold preheated at 750 ℃ to prepare an aluminum alloy cast ingot with the size of 25 multiplied by 400 mm; then carrying out heat treatment on an aluminum alloy ingot at 310 ℃ for 9 hours, then heating to 490 ℃ at a heating rate of 50 ℃/h, carrying out heat treatment at the temperature for 9 hours, then heating to 550 ℃ at a heating rate of 50 ℃/h, carrying out heat treatment for 12 hours, cooling to 400 ℃ after the heat treatment is finished, and continuously rolling into an aluminum alloy round rod with the diameter of 9.5mm by a rolling mill; carrying out multi-pass drawing on the aluminum alloy round rod on a wire drawing machine at the temperature of 40 ℃ at the speed of 6m/s, wherein the deformation of a single drawing pass is 8 percent, until the aluminum alloy round rod becomes an aluminum alloy round monofilament with the diameter of 3.84 mm; aging the aluminum alloy round monofilaments in a box-type heat treatment furnace with the temperature of 210 ℃ for 5 hours, and air-cooling the aluminum alloy round monofilaments to room temperature after aging is finished to obtain the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire.
Example 6
The embodiment provides a high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire, which comprises the following components in percentage by mass: 0.045% Zr;0.05% Er;0.015% B;0.093% Fe;0.046% Si;0.004% (Cr+Mn+V+Ti), the balance being aluminum and unavoidable trace impurities.
The embodiment also provides a preparation method of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod, which comprises the following steps: preparing an industrial aluminum ingot, an Al-B intermediate alloy, an Al-Zr intermediate alloy and an Al-Er intermediate alloy according to the components of the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire; smelting an industrial aluminum ingot in a smelting furnace at 730 ℃, adding an Al-B intermediate alloy for boronizing treatment after the industrial aluminum ingot is completely melted, stirring uniformly, adding an Al-Zr intermediate alloy and an Al-Er intermediate alloy for stirring at 720 ℃, stirring for 3 times after all raw materials are completely melted, wherein the stirring time is 10min each time, and the stirring interval time is 10min each time, so as to obtain an aluminum alloy solution; the temperature of the aluminum alloy solution is controlled to 740 ℃, high-purity nitrogen with the purity of 99.99 percent and a refining agent (the amount of the refining agent is 0.3 percent of that of the aluminum alloy solution) are introduced into the bottom of the aluminum alloy solution, wherein the refining agent comprises the following components of 30 percent of NaCl,15％KCl、40％NaF、15％Na 3 AlF 6 ) The aeration time is 15min, the mixture is stirred for 20min and then is kept stand for 30min, and then slag is removed; filtering and removing impurities from the aluminum alloy solution after slag skimming, and casting the filtered aluminum alloy solution in a ceramic material mold preheated at 750 ℃ to prepare an aluminum alloy cast ingot with the size of 25 multiplied by 400 mm; then carrying out heat treatment on the aluminum alloy cast ingot at 310 ℃ for 9 hours, then raising the temperature to 490 ℃ at the heating rate of 50 ℃/h, carrying out heat treatment at the temperature for 21 hours, reducing the temperature to 400 ℃ after the heat treatment is finished, and continuously rolling into an aluminum alloy round rod with the diameter of 9.5mm by a rolling mill; carrying out multi-pass drawing on the aluminum alloy round rod on a wire drawing machine at the temperature of 40 ℃ at the speed of 6m/s, wherein the deformation of a single drawing pass is 8 percent, until the aluminum alloy round rod becomes an aluminum alloy round monofilament with the diameter of 3.84 mm; aging the aluminum alloy round monofilaments in a box-type heat treatment furnace with the temperature of 210 ℃ for 5 hours, and air-cooling the aluminum alloy round monofilaments to room temperature after aging is finished to obtain the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire.
Test case
And (3) carrying out room-temperature conductivity, room-temperature tensile strength and high-temperature strength residual rate tests on the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rods obtained in the examples 1-7.
The conductivity at room temperature is tested by adopting GB/T3048.2-2007 standard at 20 ℃;
the room temperature tensile strength is tested by adopting GB/T4909.3-2009 standard at 20 ℃;
the high-temperature strength residual rate test is carried out at 280 ℃ according to the GB/T3051-2014 standard;
the results of the tests of the room temperature conductivity, the room temperature tensile strength and the high temperature strength residual rate are shown in Table 1.
TABLE 1
As shown in Table 1, the high-conductivity super heat-resistant aluminum alloy wire material has obvious advantages in comprehensive performance, particularly, the conductivity at room temperature (20 ℃) can reach 61.5% IACS, the tensile strength at room temperature can reach 169MPa, the residual rate of strength at 280 ℃ after heat preservation for 1h can reach 95.8%, and the heat-resistant temperature can reach 210 ℃.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. The high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire is characterized by comprising the following components in percentage by mass: 0.03 to 0.06 percent of Zr;0.05 to 0.15 percent of Er; 0.002-0.02% of B; fe is less than or equal to 0.1%; si is less than or equal to 0.05%; (Cr+Mn+V+Ti) is less than or equal to 0.005%, and the balance is aluminum and unavoidable trace impurities.
2. The method for preparing the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod as claimed in claim 1, which is characterized by comprising the following steps:
1) Smelting raw materials according to a formula proportion to obtain an aluminum alloy solution;
2) Refining, standing and casting the aluminum alloy solution to obtain an aluminum alloy cast ingot;
3) Performing heat treatment on the aluminum alloy cast ingot and then rolling to obtain an aluminum alloy round rod;
4) Drawing and aging the aluminum alloy round rod to obtain the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod;
the method comprises the steps of carrying out heat treatment on an aluminum alloy ingot, wherein the step of carrying out heat treatment on the aluminum alloy ingot comprises the steps of sequentially carrying out first heat treatment, second heat treatment and third heat treatment; the temperature of the first heat treatment is 300-320 ℃; the temperature of the second heat treatment is 480-500 ℃; the temperature of the third heat treatment is 500-600 ℃.
3. The method for preparing the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire according to claim 2, wherein the time of the first heat treatment is 8-10 h, the time of the second heat treatment is 8-10 h, and the time of the third heat treatment is 3-15 h; and/or the number of the groups of groups,
the temperature in the rolling step is 400-450 ℃; and/or the number of the groups of groups,
the diameter of the rolled aluminum alloy round rod is 8-12mm; and/or the number of the groups of groups,
the wire drawing speed in the wire drawing step is 6-8 m/s, the wire drawing temperature is 40-50 ℃, the single-pass deformation is 5-8%, and the diameter of the aluminum alloy wire obtained after wire drawing is 3.5-4mm; and/or the number of the groups of groups,
the aging temperature in the aging treatment step is 200-220 ℃, and the aging time is 4-6 h.
4. The method for preparing the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod according to claim 2, wherein the smelting process in the step 1) comprises the following steps: smelting an industrial aluminum ingot at 730-750 ℃, adding an Al-B intermediate alloy at 720-730 ℃, stirring, standing for 20-30min, adding an Al-Zr intermediate alloy and an Al-Er intermediate alloy at 720-730 ℃, stirring, and stirring for 2-3 times after all alloy materials are melted, wherein the stirring time is 10-15 min each time, and the stirring interval time is 10-15 min each time.
5. The method for preparing the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire according to claim 4, wherein the content of Al in the industrial aluminum ingot is 99.7-99.8 wt%, the content of Fe is less than or equal to 0.085wt%, the content of Si is less than or equal to 0.036wt%, and the total content of Cr, mn, V and Ti is less than or equal to 0.009wt%;
the content of B in the Al-B intermediate alloy is 2-3wt%, the content of Zr in the Al-Zr intermediate alloy is 4-6wt%, and the content of Er in the Al-Er intermediate alloy is 8-12wt%.
6. The method for manufacturing a high-strength and high-conductivity heat-resistant aluminum alloy energy-saving wire rod according to claim 2, wherein the refining step in step 2) includes: controlling the temperature of the aluminum alloy solution to 740-760 ℃, then introducing nitrogen and a refining agent into the solution, after 10-15 min of ventilation, stirring for 15-20 min, and then standing for 20-30min, and slagging off to obtain a refined aluminum alloy solution; and/or the number of the groups of groups,
the casting step is to cast the aluminum alloy solution into a ceramic material mold; and/or the number of the groups of groups,
the method further comprises the step of preheating the ceramic material die before casting, wherein the preheating temperature is 750-760 ℃; and/or the number of the groups of groups,
the method further comprises the step of filtering the refined aluminum alloy solution before the casting step.
7. The method for preparing the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire according to claim 6, wherein the purity of the nitrogen is not less than 99.99%, and the adding amount of the refining agent is 0.25% -0.30% of the weight of the aluminum alloy solution.
8. The method for preparing the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire rod according to claim 7, wherein the refining agent comprises the following components in percentage by mass: 25 to 30 percent of NaCl, 10 to 15 percent of KCl, 40 to 50 percent of NaF and 5 to 15 percent of Na 3 AlF 6 。
9. The method for producing a high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire according to any one of claims 2 to 8, wherein the step of heat-treating the aluminum alloy ingot comprises heating up to a second heat treatment temperature at a heating rate of 40 to 60 ℃/h after the completion of the first heat treatment to perform the second heat treatment, and heating up to a third heat treatment temperature at a heating rate of 40 to 60 ℃/h after the completion of the second heat treatment to perform the third heat treatment.
10. A power transmission wire, characterized in that the power transmission wire comprises the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire as claimed in claim 1 or the high-strength high-conductivity heat-resistant aluminum alloy energy-saving wire prepared by the preparation method as claimed in any one of claims 2 to 9.
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