WO2023093131A1 - Fil en alliage d'aluminium super résistant à la chaleur et son procédé de préparation - Google Patents

Fil en alliage d'aluminium super résistant à la chaleur et son procédé de préparation Download PDF

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WO2023093131A1
WO2023093131A1 PCT/CN2022/111772 CN2022111772W WO2023093131A1 WO 2023093131 A1 WO2023093131 A1 WO 2023093131A1 CN 2022111772 W CN2022111772 W CN 2022111772W WO 2023093131 A1 WO2023093131 A1 WO 2023093131A1
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temperature
aluminum alloy
aluminum
preparation
heat
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PCT/CN2022/111772
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English (en)
Chinese (zh)
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赵立洋
张桓
乔恒
段妍彤
张佳辉
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江苏亨通电力特种导线有限公司
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Publication of WO2023093131A1 publication Critical patent/WO2023093131A1/fr

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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
    • 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
    • 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
    • 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

Definitions

  • the invention belongs to the field of alloy materials, and in particular relates to a super heat-resistant aluminum alloy wire and a preparation method thereof.
  • heat-resistant aluminum alloy has advantages in urban network capacity expansion and reconstruction, substation construction and lines.
  • the heat-resistant conductor is to increase the allowable temperature of the conductor appropriately, which can increase the stable current carrying capacity of the system in case of accidents, and is used to increase the transmission capacity of the line.
  • Zr metal zirconium
  • the wire has technical characteristics such as high temperature resistance and large transmission capacity.
  • there are also disadvantages such as increased loss of the line, increased sag, and high cost of the wire during high-temperature operation, which affects its application on long-distance transmission lines.
  • the super heat-resistant aluminum alloy wire can operate at 210°C for a long time, and the short-term temperature can reach 240°C, which greatly improves the carrying capacity and greatly reduces the loss in the power transmission process, and has been greatly developed, but At present, most of the super heat-resistant aluminum alloy wires can only achieve the electrical conductivity of the single wire between 60.0-60.5%IACS, the tensile strength between 160-170MPa and the heat resistance between 160-170MPa under the premise of ensuring heat resistance. Between 91%-95%.
  • the present invention aims to provide a super heat-resistant aluminum alloy wire and a preparation method thereof. Its conductivity is ⁇ 61.5%, and its tensile strength is ⁇ 250MPa.
  • the invention provides a super heat-resistant aluminum alloy wire, which is composed of the following components in weight percentage: Si: 0.18-0.22%, Mg: 0.21-0.23%, Fe: 0.10-0.15%, Zr: 0.48-0.52%, Y : 0.04-0.08%, and the total amount of Cr, Mn, V and Ti is less than 0.005%, and the balance is Al and other unavoidable impurities.
  • the present invention also provides a method for preparing a super heat-resistant aluminum alloy wire according to claim 1, comprising the following steps:
  • the purity of the aluminum alloy is not less than 99.85%.
  • the melting temperature is 780-800° C.; the mass ratio of aluminum alloy to AlB 3 is 1000:1-5. Said refining is passed into a protective atmosphere and left to stand for 40-50 minutes at a temperature of 780-800°C.
  • step (2) 7-9kg, 1-2kg, 2-3kg, 5-7kg and 40-60kg of AlSi20, AlFe20, Mg, AlY10 and AlZr10 are added per ton of aluminum alloy respectively.
  • the secondary refining is carried out in a furnace for 20-30 minutes, standing still for 30-40 minutes, and the temperature is 780-800°C.
  • the casting temperature is 670-680°C
  • the casting speed is 7.0-7.5t/h
  • the cooling water temperature is 25-35°C
  • the billet discharge temperature is 520-550°C.
  • the rolling temperature is 510-540°C
  • the finishing rolling temperature is 200-300°C.
  • the two-stage heat treatment is to cool down to room temperature (25 ⁇ 5°C), raise the temperature to 590-620°C for 7-8h, and keep it for 15-20h;
  • the cooling rate of °C/s quickly cools down to room temperature (25 ⁇ 5°C).
  • the deformation amount of each cold drawing is 20-40%, and after 8-12 passes, the deformation is 2.8-3.6mm.
  • the aging treatment is to raise the temperature to 180-200° C. for 1-2 hours, and keep the temperature for 10-30 hours.
  • the precipitation of Mg and Si elements is promoted, thereby reducing the resistance; at the same time, the Mg2Si phase is formed to achieve the purpose of increasing the strength.
  • Sodium element is easy to form eutectic with low melting point, and it is easy to melt during high-temperature annealing process to cause structural defects, which affects material properties. Therefore, sodium-removing refining agents are introduced in the present invention to remove sodium in the ingredients.
  • Mg and Si elements can form Mg2Si phase to improve the matrix strength.
  • Si elements can promote the precipitation of Zr elements and reduce the occurrence of segregation.
  • Fe elements It can improve the creep resistance of the material, and the rare earth element Y can purify the matrix, reduce pores and impurities, refine the grains, and promote the precipitation of various elements.
  • Si, Mg, and Zr elements can be fully dissolved in the gold matrix, and at the same time promote uniform organization.
  • the Zr in the matrix can be dissolved The precipitation of elements is reduced, and the precipitation of Si and Mg elements is prevented by rapid cooling.
  • the finished product has high tensile strength, high electrical conductivity and excellent heat resistance.
  • the aluminum alloy with a purity of 99.85% into the melting furnace to heat and melt it, keep it warm at 780°C, add 3kg of AlB3 per ton of aluminum water into the melting furnace for boronization, blow into the sodium-removing refining agent (Jinlianxing, GFLUX) with argon gas -J185), refining and standing for 40min to obtain the first liquid aluminum.
  • the sodium-removing refining agent Jinlianxing, GFLUX
  • argon gas -J185 argon gas
  • the temperature of the holding furnace is 800 ° C
  • the intermediate alloys are AlSi20, AlFe20, pure Mg ingot, AlY10 and AlZr10, respectively according to 8kg/t, 1.25kg/t, 2.2kg/t, 6kg/t and 50kg/t were added.
  • a sodium-removing refining agent is blown in, and argon is used for secondary refining.
  • the furnace After standing still, the slag is removed, and the third aluminum liquid is obtained after standing; After removing the sodium refining agent, the furnace was stuffed for 20 minutes, the refining temperature was 780°C, and the standing time was 30 minutes.
  • the third aluminum liquid is poured through the holding furnace, and then degassed and filtered through the degassing box and filter box to obtain the fourth aluminum liquid, which is continuously cast at low temperature; the casting temperature is 670 ° C, and the casting The speed is 7.0t/h, the cooling water temperature is 25°C, and the billet discharge temperature is 520°C. Then, the slab obtained by continuous casting is rolled, the rolling temperature is 510° C., and the final rolling temperature is 200° C. to obtain an aluminum rod.
  • Cool the aluminum rod after winding down to room temperature and then perform two-stage heat treatment raise the temperature to 590°C for 7 hours, keep it for 15 hours, then cool it down to 440°C, keep it for 40 hours and then quickly cool it down to room temperature to get a super heat-resistant aluminum alloy rod.
  • the obtained aluminum rod is subjected to cold drawing. The amount of deformation is 30% each time, and after 10 times of drawing to 3.2mm, a super heat-resistant aluminum alloy monofilament is obtained. Aging treatment was performed on the obtained super heat-resistant aluminum alloy monofilament, the temperature was raised to 180° C. within 1 hour, and the temperature was kept for 10 hours to obtain a super heat-resistant aluminum alloy wire.
  • the aluminum alloy with a purity of 99.85% into the melting furnace to heat and melt it, keep it warm at 780°C, add 3kg of AlB3 per ton of aluminum water into the melting furnace for boronization, blow into the sodium-removing refining agent (Jinlianxing, GFLUX) with argon gas -J185), refining and standing for 40min to obtain the first liquid aluminum.
  • the sodium-removing refining agent Jinlianxing, GFLUX
  • argon gas -J185 argon gas
  • the furnace After standing still, the slag is removed, and the third aluminum liquid is obtained after standing; After removing the sodium refining agent, the furnace was stuffed for 30 minutes, the refining temperature was 780 ° C, and the standing time was 30 minutes.
  • the third aluminum liquid is poured through the holding furnace, and then degassed and double-stage filtered through the degassing box and filter box to obtain the fourth aluminum liquid, which is continuously cast at low temperature; the casting temperature is 670°C, and the casting The speed is 7.0t/h, the cooling water temperature is 25°C, and the billet discharge temperature is 520°C. Then, the slab obtained by continuous casting is rolled, the rolling temperature is 510° C., and the final rolling temperature is 200° C. to obtain an aluminum rod.
  • Cool the aluminum rod after winding down to room temperature and then perform two-stage heat treatment raise the temperature to 590°C for 7 hours, keep it for 15 hours, then cool it down to 440°C, keep it for 40 hours and then quickly cool it down to room temperature to get a super heat-resistant aluminum alloy rod.
  • the obtained aluminum rod is subjected to cold drawing. The amount of deformation is 30% each time, and after 10 times of drawing to 3.2mm, a super heat-resistant aluminum alloy monofilament is obtained. Aging treatment was performed on the obtained super heat-resistant aluminum alloy monofilament, the temperature was raised to 180° C. within 1 hour, and the temperature was kept for 10 hours to obtain a super heat-resistant aluminum alloy wire.
  • the aluminum alloy with a purity of 99.85% into the melting furnace to heat and melt it, keep it warm at 780°C, add 3kg of AlB3 per ton of aluminum water into the melting furnace for boronization, blow into the sodium-removing refining agent (Jinlianxing, GFLUX) with argon gas -J185), refining and standing for 40min to obtain the first liquid aluminum.
  • the sodium-removing refining agent Jinlianxing, GFLUX
  • argon gas -J185 argon gas
  • the temperature of the holding furnace is 800°C
  • the intermediate alloys are AlSi20, AlFe20, AlY10 and AlZr10, respectively at 8kg/t, 1.25kg/t, 6kg/t and 50kg/t added.
  • a sodium-removing refining agent is blown in, and argon is used for secondary refining.
  • the slag is removed, and the third aluminum liquid is obtained after standing;
  • the furnace was stuffed for 20 minutes, the refining temperature was 780°C, and the standing time was 30 minutes.
  • the third aluminum liquid is poured through the holding furnace, and then degassed and filtered through the degassing box and filter box to obtain the fourth aluminum liquid, which is continuously cast at low temperature; the casting temperature is 670 ° C, and the casting The speed is 7.0t/h, the cooling water temperature is 25°C, and the billet discharge temperature is 520°C. Then, the slab obtained by continuous casting is rolled, the rolling temperature is 510° C., and the final rolling temperature is 200° C. to obtain an aluminum rod.
  • Cool the aluminum rod after winding down to room temperature and then perform two-stage heat treatment raise the temperature to 590°C for 7 hours, keep it for 15 hours, then cool it down to 440°C, keep it for 40 hours and then quickly cool it down to room temperature to get a super heat-resistant aluminum alloy rod.
  • the obtained aluminum rod is subjected to cold drawing. The amount of deformation is 30% each time, and after 10 times of drawing to 3.2mm, a super heat-resistant aluminum alloy monofilament is obtained. Aging treatment was performed on the obtained super heat-resistant aluminum alloy monofilament, the temperature was raised to 180° C. within 1 hour, and the temperature was kept for 10 hours to obtain a super heat-resistant aluminum alloy wire.
  • the aluminum alloy with a purity of 99.85% into the melting furnace to heat and melt it, keep it warm at 780°C, add 3kg of AlB3 per ton of aluminum water into the melting furnace for boronization, blow into the sodium-removing refining agent (Jinlianxing, GFLUX) with argon gas -J185), refining and standing for 40min to obtain the first liquid aluminum.
  • the sodium-removing refining agent Jinlianxing, GFLUX
  • argon gas -J185 argon gas
  • an intermediate alloy to the first aluminum liquid in the holding furnace, stir for 30 minutes, and obtain the second aluminum liquid; wherein, the temperature of the holding furnace is 800°C, and the intermediate alloys are AlSi20, AlFe20, pure Mg ingots and AlZr10, respectively at 8kg/ t, 1.25kg/t, 2.2kg/t and 50kg/t were added.
  • a sodium-removing refining agent is blown in, and argon is used for secondary refining.
  • the furnace After standing still, the slag is removed, and the third aluminum liquid is obtained after standing; After removing the sodium refining agent, the furnace was stuffed for 20 minutes, the refining temperature was 780°C, and the standing time was 30 minutes.
  • the third aluminum liquid is poured through the holding furnace, and then degassed and filtered through the degassing box and filter box to obtain the fourth aluminum liquid, which is continuously cast at low temperature; the casting temperature is 670 ° C, and the casting The speed is 7.0t/h, the cooling water temperature is 25°C, and the billet discharge temperature is 520°C. Then, the slab obtained by continuous casting is rolled, the rolling temperature is 510° C., and the final rolling temperature is 200° C. to obtain an aluminum rod.
  • Cool the aluminum rod after winding down to room temperature and then perform two-stage heat treatment raise the temperature to 590°C for 7 hours, keep it for 15 hours, then cool it down to 440°C, keep it for 40 hours and then quickly cool it down to room temperature to get a super heat-resistant aluminum alloy rod.
  • the obtained aluminum rod is subjected to cold drawing. The amount of deformation is 30% each time, and after 10 times of drawing to 3.2mm, a super heat-resistant aluminum alloy monofilament is obtained. Aging treatment was performed on the obtained super heat-resistant aluminum alloy monofilament, the temperature was raised to 180° C. within 1 hour, and the temperature was kept for 10 hours to obtain a super heat-resistant aluminum alloy wire.
  • the aluminum alloy with a purity of 99.85% into the melting furnace to heat and melt it, keep it warm at 780°C, add 3kg of AlB3 per ton of aluminum water into the melting furnace for boronization, blow into the sodium-removing refining agent (Jinlianxing, GFLUX) with argon gas -J185), refining and standing for 40min to obtain the first liquid aluminum.
  • the sodium-removing refining agent Jinlianxing, GFLUX
  • argon gas -J185 argon gas
  • the third aluminum liquid is poured through the holding furnace, and then degassed and filtered through the degassing box and filter box to obtain the fourth aluminum liquid, which is continuously cast at low temperature; the casting temperature is 670 ° C, and the casting The speed is 7.0t/h, the cooling water temperature is 25°C, and the billet discharge temperature is 520°C. Then, the slab obtained by continuous casting is rolled, the rolling temperature is 510° C., and the final rolling temperature is 200° C. to obtain an aluminum rod.
  • Cool the aluminum rod after winding down to room temperature and then perform two-stage heat treatment raise the temperature to 590°C for 7 hours, keep it for 15 hours, then cool it down to 440°C, keep it for 40 hours and then quickly cool it down to room temperature to get a super heat-resistant aluminum alloy rod.
  • the obtained aluminum rod is subjected to cold drawing. The amount of deformation is 30% each time, and after 10 times of drawing to 3.2mm, a super heat-resistant aluminum alloy monofilament is obtained. Aging treatment was performed on the obtained super heat-resistant aluminum alloy monofilament, the temperature was raised to 180° C. within 1 hour, and the temperature was kept for 10 hours to obtain a super heat-resistant aluminum alloy wire.
  • the aluminum alloy with a purity of 99.85% into the melting furnace to heat and melt it, keep it warm at 780°C, add 3kg of AlB3 per ton of aluminum water into the melting furnace for boronization, blow into the sodium-removing refining agent (Jinlianxing, GFLUX) with argon gas -J185), refining and standing for 40min to obtain the first liquid aluminum.
  • the sodium-removing refining agent Jinlianxing, GFLUX
  • argon gas -J185 argon gas
  • the third aluminum liquid is poured through the holding furnace, and then degassed and filtered through the degassing box and filter box to obtain the fourth aluminum liquid, which is continuously cast at low temperature; the casting temperature is 670 ° C, and the casting The speed is 7.0t/h, the cooling water temperature is 25°C, and the billet discharge temperature is 520°C. Then, the slab obtained by continuous casting is rolled, the rolling temperature is 510° C., and the final rolling temperature is 200° C. to obtain an aluminum rod.
  • Cool the aluminum rod after winding down to room temperature and then perform two-stage heat treatment raise the temperature to 590°C for 7 hours, keep it for 15 hours, then cool it down to 440°C, keep it for 40 hours and then quickly cool it down to room temperature to get a super heat-resistant aluminum alloy rod.
  • the obtained aluminum rod is subjected to cold drawing. The amount of deformation is 30% each time, and after 10 times of drawing to 3.2mm, a super heat-resistant aluminum alloy monofilament is obtained. Aging treatment was performed on the obtained super heat-resistant aluminum alloy monofilament, the temperature was raised to 180° C. within 1 hour, and the temperature was kept for 10 hours to obtain a super heat-resistant aluminum alloy wire.
  • the aluminum alloy with a purity of 99.85% into the melting furnace to heat and melt it, keep it warm at 780°C, add 3kg of AlB3 per ton of aluminum water into the melting furnace for boronization, blow into the sodium-removing refining agent (Jinlianxing, GFLUX) with argon gas -J185), refining and standing for 40min to obtain the first liquid aluminum.
  • the sodium-removing refining agent Jinlianxing, GFLUX
  • argon gas -J185 argon gas
  • the third aluminum liquid is poured through the holding furnace, and then degassed and filtered through the degassing box and filter box to obtain the fourth aluminum liquid, which is continuously cast at low temperature; the casting temperature is 670 ° C, and the casting The speed is 7.0t/h, the cooling water temperature is 25°C, and the billet discharge temperature is 520°C. Then, the slab obtained by continuous casting is rolled, the rolling temperature is 510° C., and the final rolling temperature is 200° C. to obtain an aluminum rod.
  • Cool the aluminum rod after winding down to room temperature and then perform two-stage heat treatment raise the temperature to 590°C for 7 hours, keep it for 15 hours, then cool it down to 440°C, keep it for 40 hours and then quickly cool it down to room temperature to get a super heat-resistant aluminum alloy rod.
  • the obtained aluminum rod is subjected to cold drawing. The amount of deformation is 30% each time, and after 10 times of drawing to 3.2mm, a super heat-resistant aluminum alloy monofilament is obtained. Aging treatment was performed on the obtained super heat-resistant aluminum alloy monofilament, the temperature was raised to 180° C. within 1 hour, and the temperature was kept for 10 hours to obtain a super heat-resistant aluminum alloy wire.
  • the preparation steps are the same as those in Example 1, except that no aluminum rod is added for high-temperature annealing.
  • the preparation steps are the same as those in Example 1, except that no aluminum rod is added for low-temperature annealing.
  • the preparation steps are the same as in Example 1, except that the monofilament annealing is not added.
  • the preparation steps are the same as those in Example 1, except that the aluminum rod is first annealed at low temperature and then at high temperature.
  • Example 1 The conductivity, tensile strength and heat resistance of Example 1 were tested, and the test results are shown in Table 1.
  • the Zr element can improve the heat resistance of the material very well, but the Zr dissolved in the matrix has a great influence on the resistivity, and the precipitation of Al3Zr after heat treatment can improve the strength while reducing the resistance.
  • Mg and Si elements can The Mg2Si phase is formed to increase the strength of the matrix.
  • the Si element can promote the precipitation of the Zr element and reduce the occurrence of segregation.
  • the Fe element can improve the creep resistance of the material.
  • the rare earth element Y can purify the matrix, reduce pores and impurities, and refine the grain , to promote the precipitation of each element.
  • the finished product has high tensile strength, high electrical conductivity, elongation: 5-6%, and excellent heat resistance. After heat resistance test, more than 95% of the tensile strength remains after 240°C heat preservation for 400h, and 96.5-98.3% of the tensile strength remains after 280°C heat preservation for 1h.
  • the sodium element is easy to form a eutectic with a low melting point, and it is easy to melt during the high-temperature annealing process to cause structural defects, which will affect the material properties.
  • Si, Mg, and Zr elements can be fully dissolved in the gold matrix, and at the same time, the structure is uniform. After 440-470°C heat treatment, the Zr elements dissolved in the matrix can be completely dissolved. The precipitation is reduced, and the precipitation of Si and Mg elements is prevented by rapid cooling.

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Abstract

L'invention concerne un fil en alliage d'aluminium super résistant à la chaleur et son procédé de préparation. Le fil en alliage d'aluminium super résistant à la chaleur est composé des composants suivants en pourcentage en poids : Si : de 0,18 à 0,22 % ; Mg : de 0,21 à 0,23 %, Fe : de 0,10 à 0,15 %, Zr : de 0,48 à 0,52 %, Y : de 0,04 à 0,08 %, moins de 0,005 % de Cr, Mn, V et Ti au total, et le reste étant de l'Al et d'autres impuretés inévitables. Une tige d'aluminium obtenue par affinage, affinage secondaire, élimination des impuretés, coulée, et laminage est soumise à un traitement thermique en deux étapes, un tréfilage à froid et un traitement de vieillissement, de façon à obtenir un produit fini final, c'est-à-dire le fil en alliage d'aluminium super-résistant à la chaleur.
PCT/CN2022/111772 2021-11-25 2022-08-11 Fil en alliage d'aluminium super résistant à la chaleur et son procédé de préparation WO2023093131A1 (fr)

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CN202111416388.XA CN114086033B (zh) 2021-11-25 2021-11-25 一种超耐热铝合金导线及其制备方法

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CN114086033B (zh) * 2021-11-25 2022-05-10 江苏亨通电力特种导线有限公司 一种超耐热铝合金导线及其制备方法
CN114990375A (zh) * 2022-06-13 2022-09-02 江苏亨通电力特种导线有限公司 一种用于薄壁件的铝合金材料及其制备方法
CN115233024B (zh) * 2022-07-06 2023-04-28 江苏亨通电力特种导线有限公司 一种耐热铝合金导线及其制备方法
CN115261749B (zh) * 2022-07-12 2023-05-23 江苏亨通电力特种导线有限公司 一种高导电耐热铝合金线及其制备工艺与应用
CN115572840B (zh) * 2022-09-29 2024-01-16 吉利百矿集团有限公司 一种偏析法提纯电解铝液的方法

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