CN115522085A - High-conductivity heat-resistant hard aluminum wire and preparation method thereof - Google Patents
High-conductivity heat-resistant hard aluminum wire and preparation method thereof Download PDFInfo
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 184
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 184
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000007670 refining Methods 0.000 claims abstract description 52
- 230000032683 aging Effects 0.000 claims abstract description 24
- 238000010791 quenching Methods 0.000 claims abstract description 22
- 230000000171 quenching effect Effects 0.000 claims abstract description 22
- 238000001192 hot extrusion Methods 0.000 claims abstract description 19
- 238000005491 wire drawing Methods 0.000 claims abstract description 19
- 238000005096 rolling process Methods 0.000 claims abstract description 12
- 238000009749 continuous casting Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 81
- 238000000034 method Methods 0.000 claims description 45
- 239000012535 impurity Substances 0.000 claims description 41
- 229910000838 Al alloy Inorganic materials 0.000 claims description 40
- 238000001914 filtration Methods 0.000 claims description 37
- 238000004321 preservation Methods 0.000 claims description 34
- 238000005266 casting Methods 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 17
- 229910001371 Er alloy Inorganic materials 0.000 claims description 16
- 239000013078 crystal Substances 0.000 claims description 16
- 229910000521 B alloy Inorganic materials 0.000 claims description 14
- DJPURDPSZFLWGC-UHFFFAOYSA-N alumanylidyneborane Chemical compound [Al]#B DJPURDPSZFLWGC-UHFFFAOYSA-N 0.000 claims description 14
- -1 aluminum erbium Chemical compound 0.000 claims description 13
- 238000007664 blowing Methods 0.000 claims description 13
- 229910000737 Duralumin Inorganic materials 0.000 claims description 12
- 229910001093 Zr alloy Inorganic materials 0.000 claims description 12
- ZGUQGPFMMTZGBQ-UHFFFAOYSA-N [Al].[Al].[Zr] Chemical compound [Al].[Al].[Zr] ZGUQGPFMMTZGBQ-UHFFFAOYSA-N 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 12
- 230000008018 melting Effects 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 23
- 239000000956 alloy Substances 0.000 abstract description 23
- 238000003723 Smelting Methods 0.000 abstract description 11
- 230000014759 maintenance of location Effects 0.000 abstract description 5
- 238000004804 winding Methods 0.000 abstract 1
- 229910052726 zirconium Inorganic materials 0.000 description 13
- 229910052691 Erbium Inorganic materials 0.000 description 11
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 11
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 8
- 230000006911 nucleation Effects 0.000 description 6
- 238000010899 nucleation Methods 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 239000004020 conductor Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 229910018580 Al—Zr Inorganic materials 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/001—Retaining slag during pouring molten metal
- B22D43/004—Retaining slag during pouring molten metal by using filtering means
-
- 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
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- 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
-
- 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
-
- 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
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- 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
-
- 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
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
-
- 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
-
- 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
- C22F1/043—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 of alloys with silicon as the next major constituent
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
Abstract
The invention discloses a high-conductivity heat-resistant hard aluminum wire and a preparation method thereof, wherein the hard aluminum wire comprises the following components in percentage by weight: 0.02-0.05% of Fe, 0.02-0.06% of Si, 0.05-0.15% of Zr, 0.05-0.10% of Er, 0.005-0.02% of B and the balance of Al. The preparation method comprises the following steps: smelting, refining, continuous casting, continuous rolling, online quenching, wire winding, hot extrusion, wire drawing and aging treatment. The hard aluminum wire with the electric conductivity of more than or equal to 63.0 percent IACS and the tensile strength of more than or equal to 160MPa is finally obtained by the preparation method, and the strength retention rate of the alloy wire is more than or equal to 90 percent after 200 ℃/1 h. The high-conductivity heat-resistant hard aluminum wire has the characteristics of excellent conductivity and moderate heat resistance.
Description
Technical Field
The invention belongs to the technical field of overhead conductor preparation of power transmission lines, and particularly relates to a high-conductivity heat-resistant hard aluminum wire and a preparation method thereof.
Background
A novel power system with new energy as a main body is constructed to become the development direction of a future power grid, distributed power generation and new energy electric vehicles are connected into the power grid on a larger scale, load current is increased sharply, the maximum load current can reach multiple times of the traditional load, the current carrying capacity of the existing power line is difficult to meet the requirement, and capacity increasing transformation is needed to be carried out on the existing power line. Therefore, the current carrying capacity of the power line is improved, and the method has important significance for improving the bearing capacity of the power grid to the distributed energy.
In the aspect of overhead line capacity increase, the currently adopted methods mainly include increasing the section of a wire core, adopting low-loss materials, increasing reactive compensation, energy storage configuration, voltage coordination control, demand side response and the like, but the capacity increase effect is generally limited, and the economical efficiency is poor. By adopting an overhead line design technology based on a high-conductivity heat-resistant hard aluminum wire, the current-carrying density of the line can be greatly improved, the economic capacity increase of a power grid is realized, and the energy loss is reduced.
At present, the production process of the heat-resistant aluminum wire mainly comprises the steps of smelting, refining, continuous casting and continuous rolling to obtain a rod, and the rod is subjected to wire drawing and aging treatment to finally obtain the heat-resistant aluminum wire meeting the mechanical and electrical performance requirements. However, the conductivity of the conventional heat-resistant aluminum wire is generally 60.0% iacs due to defects of manufacturing equipment and instability of manufacturing processes, the long-term operation temperature is 150 ℃, the transmission line loss is large in practical application, and the upper limit of the long-term operation temperature of the wire is generally set to 120 ℃ in the practical use process of a power grid. Therefore, the conductivity of the heat-resistant aluminum wire is improved and the heat resistance of the wire is properly reduced on the premise of ensuring the mechanical property, and the heat-resistant aluminum wire has the double attributes of great difficulty and great significance.
In the prior art, al-Zr and Al-Er alloys are added into Al to improve the strength and heat resistance of the hard aluminum wire, but the strength performance is still not ideal.
Disclosure of Invention
The invention aims to provide a high-conductivity heat-resistant hard aluminum wire and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of a high-conductivity heat-resistant hard aluminum wire, which comprises the following steps:
melting an aluminum ingot into aluminum liquid, preserving heat, sequentially adding an aluminum boron alloy ingot, an aluminum zirconium alloy ingot and an aluminum erbium alloy ingot, and fully mixing the aluminum liquid, so that the mixed aluminum liquid comprises the following components in percentage by weight: 0.02-0.05% of Fe, 0.02-0.06% of Si, 0.05-0.15% of Zr, 0.05-0.10% of Er, 0.005-0.02% of B and the balance of Al;
blowing a refining agent along with nitrogen from the lower part of the liquid surface of the mixed aluminum liquid, refining, cleaning aluminum slag on the surface of the aluminum liquid, and keeping the temperature and standing;
sequentially filtering and removing impurities from the aluminum liquid after heat preservation and standing and continuously casting to obtain an aluminum alloy ingot blank;
carrying out continuous rolling, online quenching, aluminum rod take-up, hot extrusion of an aluminum rod, wire drawing to form a hard aluminum wire and aging treatment on the aluminum alloy ingot blank in sequence to obtain a high-conductivity heat-resistant hard aluminum wire;
in the hot extrusion process, the hot extrusion temperature is 350 +/-20 ℃.
Further, melting the aluminum ingot into aluminum liquid and preserving heat, wherein the heat preservation temperature is 780-790 ℃.
Further, the aluminum boron alloy ingot, the aluminum zirconium alloy ingot and the aluminum erbium alloy ingot are sequentially added, and when the aluminum liquid is fully mixed, the aluminum liquid is melted and stirred at the temperature of 780-790 ℃, and the stirring time is more than or equal to 3 hours.
Further, the blowing temperature of the refining agent is 780-790 ℃;
the weight ratio of the refining agent to the mixed aluminum liquid is 1;
the refining time is more than or equal to 35min.
Further, after refining, the temperature for heat preservation and standing is 765-775 ℃, and the time for heat preservation and standing is more than or equal to 35min.
Further, the filtration and impurity removal of the aluminum liquid after the heat preservation and standing are as follows:
filtering and removing impurities from the aluminum liquid flowing out of the heat preservation furnace by an external online impurity removing system, refining crystal grains and filtering, and then sending the refined crystal grains into a casting machine;
the online impurity removal system is provided with a metal filtering device, and the metal filtering device is provided with a foamed ceramic filtering plate with the pore diameter of 5-10 ppi from top to bottom, and three layers of horizontally distributed filtering plates and adsorption plates.
Furthermore, in the process of filtering and impurity removing, the temperature is 850-900 ℃, the nitrogen gas introduction amount is 30-35L/min, and the rotating speed of a rotor is set to be 100rpm.
Further, continuous casting is carried out by adopting a horizontal casting mode, the casting speed is 8-12 t/h, and the cooling water temperature is 25-30 ℃.
Furthermore, in the on-line quenching process, the quenching temperature is 20 +/-3 ℃, and the quenching pressure is 350 +/-50 kPa.
Furthermore, the temperature of the aluminum alloy rod for taking up the wire is 15-25 ℃, and the weight of each aluminum alloy rod is 2000-3000 kg.
Further, during wire drawing, an aluminum alloy rod is drawn into a high-conductivity heat-resistant hard aluminum wire with the required diameter by adopting a high-speed aluminum drawing machine, the high-speed aluminum drawing machine adopts a plurality of dies, the elongation coefficient of the first 3 passes is 1.30-1.40, the elongation coefficient of the last several passes is 1.15-1.20, the elongation coefficient of the wire outlet die is gradually reduced to 1.08, and the wire drawing speed is 10-16 m/s.
Furthermore, the temperature of the aging treatment is 180-195 ℃, and the aging time is 15-20 h.
The invention provides a high-conductivity heat-resistant hard aluminum wire prepared by the method, and the hard aluminum wire comprises the following components in percentage by weight: 0.02-0.05% of Fe, 0.02-0.06% of Si, 0.05-0.15% of Zr, 0.05-0.10% of Er, 0.005-0.02% of B and the balance of Al.
The invention has the following beneficial effects:
(1) The Al is added with Al-Zr alloy and Al-Er alloy, and Er element can make the Al alloy overcooledIncrease and refine crystal grains, reduce gas and impurities in the alloy, improve the strength and the conductivity of the aluminum alloy, and meanwhile, erbium can form smaller and dispersedly distributed Al with zirconium 3 The (ZrEr) composite phase improves the strength and heat resistance of the alloy.
(2) In the preparation process, an aluminum boron alloy ingot, an aluminum zirconium alloy ingot and an aluminum erbium alloy ingot are sequentially added, because the aluminum boron alloy ingot is added, impurities such as Pb, V, mn and the like in molten aluminum can be removed, and because B element is also combined with Zr and Er to form a second phase precipitate, the B element is added into molten aluminum for impurity removal; the Al-Er alloy and the Al-Zr alloy mainly play the roles of refining crystal grains and improving the heat resistance of the aluminum conductor and are added before the final refining.
(3) In the invention, the contents of the zirconium element and the erbium element are respectively 0.05-0.15% and 0.05-0.10%. According to the phase diagram of the Al-Er binary alloy, the Er forms Al in the Al 3 Er Compound, maximum solid solubility of Er in aluminum in equilibrium<0.05%, al can be formed on the one hand by adding a certain amount of zirconium 3 The (ZrEr) composite phase increases the solid solubility of erbium in aluminum and enhances the optimization effect of erbium on the strength and the conductivity of aluminum alloy, so that the content of erbium is controlled to be 0.05-0.10%; on the other hand, zirconium forms Al with aluminum 3 Zr is used as heterogeneous nucleation core when the Zr is dispersed and finely precipitated, and blocks recrystallization nucleation during heating, so that the crystal grains of the aluminum alloy are refined, the short-time heat resistance is improved, but the increase of the zirconium content can bring adverse effect on the conductivity, so that the zirconium content in the final alloy is controlled to be 0.05-0.15%, and the alloy can be ensured to have better comprehensive performance.
(4) The invention adds the hot extrusion process, after the hot extrusion at 350 +/-20 ℃, the precipitated phase is dissolved into the alloy again, and simultaneously, the stress generated in the rolling process of the aluminum rod is reduced, so that the strengthening phase is uniformly and finely precipitated in the subsequent process, and the strength and the electric conductivity of the high-electric-conductivity heat-resistant hard aluminum wire are improved.
(5) The aging treatment temperature is 180-195 ℃, the aging time is 15-20 h, a high-density fine-dispersed GP zone can be formed in the alloy, a nucleation core is provided for a finally aged precipitated phase, the distribution of the alloy precipitated phase can be effectively improved, and the alloy has good strength and conductivity while maintaining medium and high strength.
(6) The high-conductivity heat-resistant duralumin wire prepared by the method has the characteristics of high conductivity, moderate heat resistance, high strength and good corrosion resistance, can be applied to conventional capacity-increased overhead transmission lines, can also be applied to high-altitude areas with large span and large fall, and has remarkable economic benefit.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The embodiment provides a high-conductivity heat-resistant hard aluminum wire, which comprises the following chemical components in percentage by weight: 0.02-0.05% of Fe, 0.02-0.06% of Si, 0.05-0.15% of Zr, 0.05-0.10% of Er, 0.005-0.02% of B and the balance of Al.
Er: erbium element can increase the supercooling of the aluminum alloy components, refine crystal grains, reduce gas and impurities in the alloy, improve the strength and conductivity of the aluminum alloy, and simultaneously form finer and dispersedly distributed Al with zirconium 3 The (ZrEr) composite phase improves the strength and heat resistance of the alloy, and in the embodiment, the content of Er is controlled to be 0.05-0.10%.
Zr: zirconium element may form Al on the one hand 3 The (ZrEr) composite phase increases the solid solubility of erbium in aluminum and enhances the optimization effect of erbium on the strength and the electrical conductivity of aluminum alloy; on the other hand, zirconium forms Al with aluminum 3 Zr is used as heterogeneous nucleation core when the Zr is dispersed and finely precipitated, and blocks recrystallization nucleation during heating, so that the crystal grains of the aluminum alloy are refined, the short-time heat resistance is improved, but the increase of the zirconium content can bring adverse effects on the conductivity, and in the embodiment, the zirconium content is controlled to be 0.05-0.15% so as to ensure that the alloy has better performance.
Si: the Si content is controlled to be in a lower level, so that the conductivity of the aluminum conductor can be obviously improved.
Fe: the Fe content is controlled to be in a lower level, so that the conductivity of the aluminum conductor can be obviously improved.
Example 2
This example provides a method for preparing the high-conductivity, heat-resistant duralumin wire of example 1, comprising the steps of:
the method comprises the following steps: melting an aluminum ingot into aluminum liquid, preserving heat, sequentially adding an aluminum boron alloy ingot, an aluminum zirconium alloy ingot and an aluminum erbium alloy ingot, and fully mixing the aluminum liquid with the aluminum liquid, wherein the mixed aluminum liquid comprises the following components in percentage by weight: 0.02-0.05% of Fe, 0.02-0.06% of Si, 0.05-0.15% of Zr, 0.05-0.10% of Er, 0.005-0.02% of B and the balance of Al.
Step two: blowing a refining agent along with nitrogen from the lower part of the liquid surface of the mixed aluminum liquid, refining, cleaning aluminum slag on the surface of the aluminum liquid, and keeping the temperature and standing;
step three: filtering and removing impurities from the aluminum liquid in sequence and continuously casting to obtain an aluminum alloy ingot blank;
step four: and (3) carrying out continuous rolling, on-line quenching, aluminum rod take-up, hot extrusion of the aluminum rod, wire drawing to form a hard aluminum wire and aging treatment on the aluminum alloy ingot blank in sequence.
In this embodiment, a mode of sequentially adding an aluminum-boron alloy ingot, an aluminum-zirconium alloy ingot, and an aluminum-erbium alloy ingot is adopted, because the aluminum-boron alloy ingot is added to remove impurities such as Pb, V, mn, etc. in the aluminum liquid, and because B element is also combined with Zr and Er to form a second phase precipitate, B element is added to the aluminum melt to remove impurities; the Al-Er alloy and the Al-Zr alloy mainly play the roles of refining crystal grains and improving the heat resistance of the aluminum conductor and are added before the final refining.
Example 3
This example provides a method for preparing the high-conductivity, heat-resistant duralumin wire of example 1, comprising the steps of:
the method comprises the following steps: smelting: melting an aluminum ingot in a smelting furnace to form aluminum liquid, and filling the aluminum liquid into a heat preservation furnace for heat preservation; according to the weight ratio of each component in the embodiment 1, adding an aluminum boron alloy ingot, an aluminum zirconium alloy ingot, an aluminum erbium alloy ingot and aluminum liquid in sequence and fully mixing; step two: refining: after smelting is finished, blowing a refining agent along with nitrogen from the liquid level of the molten aluminum in an insulation furnace, refining, cleaning aluminum slag on the surface of the molten aluminum, and carrying out insulation standing;
step three: continuous casting: filtering and removing impurities from the aluminum liquid flowing out of the heat preservation furnace through an external online impurity removal system, refining and filtering crystal grains, and then sending the refined and filtered aluminum liquid into a casting machine, and continuously casting the refined and filtered aluminum liquid in a horizontal casting mode to obtain an aluminum alloy ingot blank;
step four: and (3) continuous rolling: heating the aluminum alloy ingot blank to 550-570 ℃ by an inductor, and continuously rolling;
step five: quenching on line;
step six: taking up;
step seven: hot extrusion; extruding the aluminum rod into an aluminum rod with a required diameter by adopting an extruder;
step eight: drawing wires;
step nine: and (5) aging treatment.
In this embodiment, the aluminum content in the selected aluminum ingot is 99.85%.
In the embodiment, when the aluminum liquid is filled into the heat preservation furnace, the temperature in the heat preservation furnace is 780-790 ℃.
In the embodiment, when the aluminum boron alloy ingot, the aluminum zirconium alloy ingot, the aluminum erbium alloy ingot and the aluminum liquid are added and fully mixed, the aluminum liquid is fully mixed when the temperature in the heat preservation furnace is 780-790 ℃ for melting and stirring, the stirring time is more than or equal to 3h.
In the embodiment, the blowing temperature of the refining agent is 780-790 ℃, the weight ratio of the refining agent to the molten aluminum is 1; the temperature for standing after refining is 765-775 ℃, and the time is more than or equal to 35min.
In this example, the refining agent is KCl or NaNO 4 、C 2 Cl 6 、NaAlF 6 、NaSiF 6 And NaCl solid powdered mixture.
In the embodiment, an online impurity removal system is adopted to filter and remove impurities on the surface of aluminum liquid, the online impurity removal system is provided with a metal filtering device, and a foamed ceramic filtering plate with the pore diameter of 5-10 ppi from top to bottom, and three layers of horizontally distributed filtering plates and adsorption plates are arranged in the device; wherein, the filter plate is 2 layers, and the adsorption plate is 1 layer. The temperature of the online impurity removal system is 850-900 ℃, the nitrogen introduction amount is 30-35L/min, the rotor rotation speed is set to 100rpm, and the hydrogen content after impurity removal is less than or equal to 0.120mL/100g.
In the embodiment, the continuous casting is carried out by adopting a horizontal casting mode, the casting speed is 8-12 t/h, and the cooling water temperature is 25-30 ℃.
In the present example, the quenching temperature was 20. + -. 3 ℃ and the quenching pressure was 350. + -. 50kPa.
In the embodiment, the temperature of the aluminum alloy rod for taking up the wire is 15-25 ℃, and the weight of each aluminum alloy rod is 2000-3000 kg.
In the embodiment, the hot extrusion process is added, the precipitated phase is re-dissolved in the alloy after the hot extrusion at 350 +/-20 ℃, and meanwhile, the stress generated in the aluminum rod rolling process is reduced, so that the strengthening phase is uniformly and finely precipitated in the subsequent process, and the strength and the electric conductivity of the high-electric-conductivity heat-resistant hard aluminum wire are improved.
In the embodiment, an aluminum alloy rod is drawn into a high-conductivity heat-resistant hard aluminum wire with the required diameter by adopting a high-speed aluminum drawing machine, the high-speed aluminum drawing machine adopts a plurality of dies, the elongation coefficient of the front 3 dies is 1.30-1.40, the elongation coefficient of the rear 3 dies is 1.15-1.20, the elongation coefficient from the die to the wire outlet is gradually reduced to 1.08, and the wire drawing speed is 10-16 m/s.
In the embodiment, an aging mode that the aging treatment temperature is 180-195 ℃ and the aging time is 15-20 h is adopted, so that a high-density fine-dispersed GP zone can be formed in the alloy, a nucleation core is provided for a finally aged precipitated phase, the distribution of the alloy precipitated phase can be effectively improved, and the alloy has high strength and good conductivity while maintaining medium and high strength.
The electric conductivity of the duralumin wire prepared by the method of this example was 63.1 to 63.5%, the tensile strength was 160 to 175MPa, and the retention of the strength of the wire after 200 ℃/1 hour was 90 to 95%.
Example 4
The embodiment provides a preparation method of a high-conductivity heat-resistant hard aluminum wire, which comprises the following steps:
the method comprises the following steps: melting an aluminum ingot in a smelting furnace to form aluminum liquid, filling the aluminum liquid into a heat preservation furnace for heat preservation at the temperature of 780-790 ℃; sequentially adding an aluminum boron alloy ingot, an aluminum zirconium alloy ingot and an aluminum erbium alloy ingot into a heat preservation furnace, melting and stirring for 3.5 hours, and fully mixing with the aluminum liquid to ensure that the mixed aluminum liquid comprises the following components in percentage by weight: 0.02% of Fe, 0.02% of Si, 0.08% of Zr, 0.05% of Er, 0.012% of B and the balance of Al. The contents of the components are shown in table 1.
Step two: after smelting is finished, blowing a refining agent along with nitrogen from the liquid level of the mixed aluminum liquid in an insulation furnace, refining, cleaning aluminum slag on the surface of the aluminum liquid, and keeping the temperature and standing; in the step, the blowing temperature of the refining agent is 780-790 ℃; the weight ratio of the refining agent to the mixed aluminum liquid is 1; refining for 45min; keeping the temperature and standing still after refining at 765-775 ℃ for 60min.
Step three: filtering and removing impurities from the aluminum liquid after heat preservation and standing, and continuously casting to obtain an aluminum alloy ingot blank;
in the step, the process of filtering and removing impurities from the aluminum liquid after heat preservation and standing comprises the following steps:
filtering and removing impurities from the aluminum liquid flowing out of the heat-preserving furnace through an external online impurity removal system, refining crystal grains, filtering and then sending the aluminum liquid into a casting machine; in the process of filtering and impurity removing, the temperature is 850-900 ℃, the nitrogen gas input amount is 30-35L/min, and the rotating speed of a rotor is set as 100rpm.
In the step, a horizontal casting mode is adopted for continuous casting, the casting speed is 10t/h, and the temperature of cooling water is 25-30 ℃.
Step four: and (3) carrying out continuous rolling, on-line quenching, aluminum rod take-up, hot extrusion of the aluminum rod, wire drawing to form a hard aluminum wire and aging treatment on the aluminum alloy ingot blank in sequence.
In the step, the online quenching temperature is 20 +/-3 ℃, and the quenching pressure is 350 +/-50 kPa.
In the step, the temperature of the aluminum alloy rod for taking up the wire is 15-25 ℃, and the weight of each plate of aluminum alloy rod is 2000-3000 kg.
In this step, the hot extrusion temperature was 350 ± 20 ℃.
In the step, during wire drawing, an aluminum alloy rod is drawn into a high-conductivity heat-resistant hard aluminum wire with the required diameter by adopting a high-speed aluminum drawing machine, the high-speed aluminum drawing machine adopts a plurality of dies, the elongation coefficient of the front 3 dies is 1.30-1.40, the elongation coefficient of the rear 3 dies is 1.15-1.20, the elongation coefficient of the wire outlet die is gradually reduced to 1.08, and the wire drawing speed is 13m/s.
In the step, the temperature of the aging treatment is 190 ℃, and the aging time is 18h.
The wire diameter of the duralumin wire prepared by the method of this example was 3.60mm, the conductivity was 63.38% IACS, the tensile strength was 166MPa, and the retention of the strength of the alloy wire after 200 ℃/1h was 93.8%. As shown in table 2.
Example 5
The embodiment provides a preparation method of a high-conductivity heat-resistant hard aluminum wire, which comprises the following steps:
the method comprises the following steps: melting an aluminum ingot in a smelting furnace to form aluminum liquid, filling the aluminum liquid into a heat preservation furnace for heat preservation at the temperature of 780-790 ℃; sequentially adding an aluminum boron alloy ingot, an aluminum zirconium alloy ingot and an aluminum erbium alloy ingot into a heat preservation furnace, melting and stirring for 3.2 hours, and fully mixing with the aluminum liquid, so that the mixed aluminum liquid comprises the following components in percentage by weight: 0.04% of Fe, 0.03% of Si, 0.09% of Zr, 0.08% of Er, 0.015% of B and the balance of Al. The contents of the components are shown in table 1.
Step two: after smelting is finished, blowing a refining agent along with nitrogen from the liquid level of the mixed aluminum liquid in an insulation furnace, refining, cleaning aluminum slag on the surface of the aluminum liquid, and keeping the temperature and standing; in the step, the blowing temperature of the refining agent is 780-790 ℃; the weight ratio of the refining agent to the mixed aluminum liquid is 1; refining for 48min; keeping the temperature and standing still after refining at 765-775 ℃ for 55min.
Step three: sequentially filtering and removing impurities from the aluminum liquid after heat preservation and standing and continuously casting to obtain an aluminum alloy ingot blank;
in the step, the process of filtering and removing impurities from the aluminum liquid after heat preservation and standing comprises the following steps:
filtering and removing impurities from the aluminum liquid flowing out of the heat preservation furnace by an external online impurity removing system, refining crystal grains and filtering, and then sending the refined crystal grains into a casting machine; in the process of filtering and impurity removing, the temperature is 850-900 ℃, the nitrogen gas input amount is 30-35L/min, and the rotating speed of a rotor is set as 100rpm.
In the step, continuous casting is carried out by adopting a horizontal casting mode, the casting speed is 11t/h, and the temperature of cooling water is 25-30 ℃.
Step four: and (3) carrying out continuous rolling, on-line quenching, aluminum rod take-up, hot extrusion of the aluminum rod, wire drawing to form a hard aluminum wire and aging treatment on the aluminum alloy ingot blank in sequence.
In the step, the online quenching temperature is 20 +/-3 ℃, and the quenching pressure is 350 +/-50 kPa.
In the step, the temperature of the aluminum alloy rod for taking up the wire is 15-25 ℃, and the weight of each aluminum alloy rod is 2000-3000 kg.
In this step, the hot extrusion temperature was 350 ± 20 ℃.
In the step, during wire drawing, an aluminum alloy rod is drawn into a high-conductivity heat-resistant hard aluminum wire with the required diameter by adopting a high-speed aluminum drawing machine, the high-speed aluminum drawing machine adopts a plurality of dies, the coefficient of elongation of the first 3 dies is 1.30-1.40, the coefficient of elongation of the last several dies is 1.15-1.20, the coefficient of elongation of the die to the wire outlet is gradually reduced to 1.08, and the wire drawing speed is 13m/s.
In the step, the temperature of the aging treatment is 195 ℃, and the aging time is 16h.
The wire diameter of the duralumin wire prepared by the method of this example was 3.62mm, the conductivity was 63.22% IACS, the tensile strength was 165MPa, and the retention of the strength of the alloy wire after 200 ℃/1h was 94.6%. As shown in table 2.
Example 6
The embodiment provides a preparation method of a high-conductivity heat-resistant hard aluminum wire, which comprises the following steps:
the method comprises the following steps: melting an aluminum ingot in a smelting furnace to form aluminum liquid, filling the aluminum liquid into a heat preservation furnace for heat preservation at the temperature of 780-790 ℃; sequentially adding an aluminum boron alloy ingot, an aluminum zirconium alloy ingot and an aluminum erbium alloy ingot into a heat preservation furnace, melting and stirring for 3.3 hours, and fully mixing with the aluminum liquid to ensure that the mixed aluminum liquid comprises the following components in percentage by weight: 0.03 percent of Fe, 0.04 percent of Si, 0.06 percent of Zr, 0.06 percent of Er, 0.008 percent of B and the balance of Al. The contents of the components are shown in table 1.
Step two: after the smelting is finished, blowing a refining agent along with nitrogen from the liquid level of the mixed aluminum liquid in an insulation furnace, refining, cleaning aluminum slag on the surface of the aluminum liquid, and keeping the temperature and standing; in the step, the blowing temperature of the refining agent is 780-790 ℃; the weight ratio of the refining agent to the mixed aluminum liquid is 1; refining time is 65min; keeping the temperature and standing still after refining at 765-775 ℃ for 70min.
Step three: sequentially filtering and removing impurities from the aluminum liquid after heat preservation and standing and continuously casting to obtain an aluminum alloy ingot blank;
in the step, the process of filtering and removing impurities from the aluminum liquid after heat preservation and standing comprises the following steps:
filtering and removing impurities from the aluminum liquid flowing out of the heat preservation furnace by an external online impurity removing system, refining crystal grains and filtering, and then sending the refined crystal grains into a casting machine; in the process of filtering and impurity removing, the temperature is 850-900 ℃, the nitrogen gas input amount is 30-35L/min, and the rotating speed of a rotor is set as 100rpm.
In the step, a horizontal casting mode is adopted for continuous casting, the casting speed is 10t/h, and the temperature of cooling water is 25-30 ℃.
Step four: and (3) carrying out continuous rolling, on-line quenching, aluminum rod take-up, hot extrusion of the aluminum rod, wire drawing to form a hard aluminum wire and aging treatment on the aluminum alloy ingot blank in sequence.
In the step, the online quenching temperature is 20 +/-3 ℃, and the quenching pressure is 350 +/-50 kPa.
In the step, the temperature of the aluminum alloy rod for taking up the wire is 15-25 ℃, and the weight of each plate of aluminum alloy rod is 2000-3000 kg.
In this step, the hot extrusion temperature was 350 ± 20 ℃.
In the step, during wire drawing, an aluminum alloy rod is drawn into a high-conductivity heat-resistant hard aluminum wire with the required diameter by adopting a high-speed aluminum drawing machine, the high-speed aluminum drawing machine adopts a plurality of dies, the coefficient of elongation of the first 3 dies is 1.30-1.40, the coefficient of elongation of the last several dies is 1.15-1.20, the coefficient of elongation of the die to the wire outlet is gradually reduced to 1.08, and the wire drawing speed is 15m/s.
In the step, the temperature of the aging treatment is 200 ℃, and the aging time is 17h.
The wire diameter of the duralumin wire prepared by the method of this example was 3.61mm, the conductivity was 63.15% IACS, the tensile strength was 161MPa, and the retention of the strength of the alloy wire after 200 ℃/1h was 91.3%. As shown in table 2.
TABLE 1 composition table (wt%) of the duralumin alloys prepared in each example
| Group of | B | Si | Zr | Fe | Er |
| Example 4 | 0.012 | 0.02 | 0.09 | 0.02 | 0.05 |
| Example 5 | 0.015 | 0.03 | 0.08 | 0.04 | 0.08 |
| Example 6 | 0.008 | 0.04 | 0.06 | 0.03 | 0.06 |
Table 2 results of performance tests of duralumin monofilament material prepared in each example
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (14)
1. A preparation method of a high-conductivity heat-resistant hard aluminum wire is characterized by comprising the following steps:
melting an aluminum ingot into aluminum liquid, preserving heat, sequentially adding an aluminum boron alloy ingot, an aluminum zirconium alloy ingot and an aluminum erbium alloy ingot, and fully mixing the aluminum liquid, so that the mixed aluminum liquid comprises the following components in percentage by weight: 0.02-0.05% of Fe, 0.02-0.06% of Si, 0.05-0.15% of Zr, 0.05-0.10% of Er, 0.005-0.02% of B and the balance of Al;
blowing a refining agent along with nitrogen from the lower part of the liquid surface of the mixed aluminum liquid, refining, cleaning aluminum slag on the surface of the aluminum liquid, and keeping the temperature and standing;
filtering and removing impurities from the aluminum liquid after heat preservation and standing, and continuously casting to obtain an aluminum alloy ingot blank;
carrying out continuous rolling, online quenching, aluminum rod take-up, hot extrusion of an aluminum rod, wire drawing to form a hard aluminum wire and aging treatment on the aluminum alloy ingot blank in sequence to obtain a high-conductivity heat-resistant hard aluminum wire;
in the hot extrusion process, the hot extrusion temperature is 350 +/-20 ℃.
2. The method for preparing the high-conductivity heat-resistant hard aluminum wire according to claim 1, wherein an aluminum ingot is melted into aluminum liquid and the aluminum liquid is subjected to heat preservation at the temperature of 780-790 ℃.
3. The method for preparing the high-conductivity heat-resistant hard aluminum wire as claimed in claim 1, wherein the aluminum boron alloy ingot, the aluminum zirconium alloy ingot and the aluminum erbium alloy ingot are sequentially added, and when the aluminum liquid is fully mixed, the aluminum liquid is melted and stirred at 780-790 ℃ for more than or equal to 3 hours.
4. The method of claim 1, wherein the refining agent is KCl, naNO 4 、C 2 Cl 6 、NaAlF 6 、NaSiF 6 And a NaCl solid powdered mixture;
the blowing temperature of the refining agent is 780-790 ℃;
the weight ratio of the refining agent to the mixed aluminum liquid is 1;
the refining time is more than or equal to 35min.
5. The preparation method of the high-conductivity heat-resistant hard aluminum wire as claimed in claim 4, wherein the temperature for heat preservation and standing is 765-775 ℃ and the time for heat preservation and standing is not less than 35min after refining.
6. The method for preparing the high-conductivity heat-resistant hard aluminum wire according to claim 1, wherein the aluminum liquid after being kept warm is filtered to remove impurities, and the method comprises the following steps:
and filtering and removing impurities from the aluminum liquid flowing out of the heat preservation furnace by an external online impurity removing system, refining crystal grains, filtering and then feeding the refined crystal grains into a casting machine.
7. The method for preparing the high-conductivity heat-resistant duralumin wire as claimed in claim 6, wherein the online impurity removing system is provided with a metal filtering device, and the metal filtering device is provided with a foamed ceramic filtering plate with a pore size of 5-10ppi from top to bottom.
8. The method for preparing the high-conductivity heat-resistant hard aluminum wire as claimed in claim 6, wherein in the filtering and impurity removing process, the temperature is 850-900 ℃, the nitrogen gas introduction amount is 30-35L/min, and the rotation speed of a rotor is set to 100rpm.
9. The method for preparing the high-conductivity heat-resistant hard aluminum wire according to claim 1, wherein the continuous casting is carried out in a horizontal casting mode, the casting speed is 8-12 t/h, and the cooling water temperature is 25-30 ℃.
10. The method for preparing the high-conductivity heat-resistant hard aluminum wire according to claim 1, wherein in the on-line quenching process, the quenching temperature is 20 +/-3 ℃ and the quenching pressure is 350 +/-50 kPa.
11. The method for preparing the high-conductivity heat-resistant hard aluminum wire as claimed in claim 1, wherein the temperature of an aluminum alloy rod for taking up the wire is 15-25 ℃, and the weight of the aluminum alloy rod per coil is 2000-3000 kg.
12. The method for preparing the high-conductivity heat-resistant hard aluminum wire according to claim 1, wherein during wire drawing, an aluminum alloy rod is drawn into the high-conductivity heat-resistant hard aluminum wire with a required diameter by a high-speed aluminum drawing machine;
the high-speed aluminum drawing machine adopts a plurality of dies, the first 3 dies have the elongation coefficient of 1.30 to 1.40, the last 3 dies have the elongation coefficient of 1.15 to 1.20, the elongation coefficient of the die to the outgoing line is gradually reduced to 1.08, and the wire drawing speed is 10 to 16m/s.
13. The method for preparing the high-conductivity heat-resistant hard aluminum wire according to claim 1, wherein the temperature of the aging treatment is 180-195 ℃, and the aging time is 15-20h.
14. A high-conductivity heat-resistant duralumin wire, produced using the method of any one of claims 1-13, wherein the duralumin wire comprises, in weight percent: 0.02-0.05% of Fe, 0.02-0.06% of Si, 0.05-0.15% of Zr, 0.05-0.10% of Er, 0.005-0.02% of B and the balance of Al.
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