CN117701951A - High-conductivity super heat-resistant aluminum alloy monofilament material and preparation method thereof - Google Patents
High-conductivity super heat-resistant aluminum alloy monofilament material and preparation method thereof Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 87
- 239000000463 material Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 71
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 71
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 45
- 239000000956 alloy Substances 0.000 claims abstract description 45
- 238000003723 Smelting Methods 0.000 claims abstract description 25
- 239000012535 impurity Substances 0.000 claims abstract description 22
- 238000004321 preservation Methods 0.000 claims abstract description 16
- 238000005096 rolling process Methods 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 238000000137 annealing Methods 0.000 claims abstract description 9
- 229910052796 boron Inorganic materials 0.000 claims abstract description 9
- 238000007670 refining Methods 0.000 claims abstract description 9
- 229910052790 beryllium Inorganic materials 0.000 claims abstract description 8
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 7
- 150000002910 rare earth metals Chemical class 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 13
- 239000004020 conductor Substances 0.000 description 7
- 229910018167 Al—Be Inorganic materials 0.000 description 6
- 238000005885 boration reaction Methods 0.000 description 5
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 4
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910020785 La—Ce Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- WMOHXRDWCVHXGS-UHFFFAOYSA-N [La].[Ce] Chemical compound [La].[Ce] WMOHXRDWCVHXGS-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- FRWYFWZENXDZMU-UHFFFAOYSA-N 2-iodoquinoline Chemical compound C1=CC=CC2=NC(I)=CC=C21 FRWYFWZENXDZMU-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 101000993059 Homo sapiens Hereditary hemochromatosis protein Proteins 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000003483 aging Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- -1 aluminum-iron-silicon compounds Chemical class 0.000 description 1
- LTPBRCUWZOMYOC-UHFFFAOYSA-N beryllium oxide Inorganic materials O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 150000002506 iron compounds Chemical class 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
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- 229910052720 vanadium Inorganic materials 0.000 description 1
Abstract
The invention provides a high-conductivity super heat-resistant aluminum alloy monofilament material and a preparation method thereof, wherein the alloy monofilament comprises the following elements in percentage by mass: 0.2 to 0.4 percent of Zr, 0.2 to 0.3 percent of Ce (La), 0.2 to 0.4 percent of Be, 0.02 to 0.03 percent of B, less than or equal to 0.06 percent of Si, less than or equal to 1.5 percent of Fe, and the balance of aluminum and unavoidable other trace impurities; the obtained high-conductivity super heat-resistant aluminum alloy monofilament has the conductivity not lower than 61.5 percent IACS (20 ℃), the tensile strength not lower than 160MPa, the elongation not lower than 2 percent and the residual rate of room temperature strength not lower than 90 percent after heat preservation for 1h at 280 ℃. The preparation method comprises smelting, refining, casting, rolling, drawing and annealing. The technical scheme provided by the invention solves the defects of poor conductivity and high power transmission line loss of the high-conductivity super heat-resistant aluminum alloy monofilament in the prior art.
Description
Technical field:
the invention belongs to the technical field of electrical conductor materials, and relates to a high-conductivity super heat-resistant aluminum alloy monofilament material and a preparation method thereof.
The background technology is as follows:
the construction of a novel power system taking new energy as a main body and the construction of a safe and efficient power transmission line are important demands of China, but the active power transmission line mainly adopts an ordinary steel-cored aluminum strand, has low heat-resistant temperature, small transmission capacity margin and large sag in high-temperature operation, and severely restricts the safe and efficient transmission of electric energy and the large-scale consumption of new energy.
The super heat-resistant aluminum alloy wire is a special capacity-increasing wire with good performance, the maximum allowable running temperature reaches 210 ℃ (280 ℃ for 1h, the residual rate of room temperature strength is more than 90 percent), and the capacity increase can be realized by more than 1 time by directly replacing the original wire without replacing a pole tower. However, the conductivity of the active super heat-resistant aluminum alloy wire is 60% IACS, which is 1% lower than that of the common steel-cored aluminum stranded wire, and the active super heat-resistant aluminum alloy wire has poor conductivity and high power transmission line loss. It is desirable to develop a high conductivity super heat resistant aluminum alloy monofilament material to meet the needs of the prior art.
The invention comprises the following steps:
the invention aims to develop a high-conductivity super heat-resistant aluminum alloy monofilament material by taking an aluminum ingot with the purity of more than or equal to 99.7% as a raw material, and solve the technical problems of low conductivity and high transmission line loss of the existing super heat-resistant aluminum alloy monofilament and lead products.
The technical scheme for realizing the technical purpose of the invention is as follows:
the high-conductivity super heat-resistant aluminum alloy monofilament material comprises the following alloy elements in percentage by mass: 0.2 to 0.4 percent of Zr, 0.2 to 0.3 percent of Ce (La), 0.2 to 0.4 percent of Be, 0.02 to 0.03 percent of B, less than or equal to 0.06 percent of Si, less than or equal to 1.5 percent of Fe, and the balance of aluminum content and unavoidable impurities.
Preferably: the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: zr:0.40%, ce:0.30%, be 0.40%, B:0.03%, si:0.06%, fe:1.50% of aluminum and the balance of unavoidable impurities.
Preferably: the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: zr:0.20%, la:0.20%, la:0.20%, be 0.20%, B0.02%, si:0.06%, fe:1.00% of aluminum and the balance of unavoidable impurities.
Preferably: the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: zr:0.30%, ce+La:0.15%, be 0.30%, B:0.02%, si:0.05%, fe:1.2% of aluminum and the balance of unavoidable impurities.
Preferably: the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: zr:0.25%, la:0.27%, be 0.35%, B0.025%, si:0.04%, fe:0.9%, the balance of aluminum content and unavoidable other impurities.
Preferably: the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: zr:0.35%, ce:0.22%, be 0.25%, B0.03%, si:0.05%, fe:1.1% of aluminum and the balance of unavoidable impurities.
Preferably: the alloy monofilament has the conductivity of 61% IACS (20 ℃) or more, the tensile strength of 160MPa or more, the elongation of 2% or more and the residual rate of room temperature strength of 90% or more after heat preservation for 1 hour at 280 ℃.
Based on the same inventive concept, the application also provides a method for preparing the high-conductivity super heat-resistant aluminum alloy monofilament material, which comprises the following steps:
smelting: selecting an industrial pure aluminum ingot with purity more than or equal to 99.7%, adding the industrial pure aluminum ingot into a smelting furnace, and adding intermediate alloy for boride treatment after pure aluminum is completely melted; adding intermediate alloy or mixed rare earth, stirring for 10-15 min after complete melting, and keeping the temperature and standing for 20-30 min;
refining: blowing nitrogen (N) at 710-720 DEG C 2 ) Blowing for 10-15 min, keeping the temperature and standing for 10-20 min, and then skimming;
casting: pouring the aluminum alloy liquid into a preheated metal mold at 690-710 ℃ to cast an aluminum ingot.
Preferably: wherein the smelting temperature is 730-750 ℃.
Preferably: wherein the preheating temperature is 250-300 ℃.
Preferably: the method further comprises the steps of:
rolling: the aluminum ingot is rolled after being insulated for 1 to 3 hours at the temperature of 510 to 530 ℃, and is insulated for 20 to 40 hours at the temperature of 400 to 450 ℃ after being rolled into an aluminum alloy round rod for multiple passes;
drawing: the aluminum alloy round rod cooled to room temperature is subjected to multi-pass drawing to obtain aluminum alloy monofilaments;
annealing: the monofilament is air cooled after heat preservation for 1 to 4 hours at the temperature of 100 to 140 ℃.
Compared with the closest prior art, the invention has the following beneficial effects:
firstly, it should be noted that in the technical scheme provided by the invention, the action and mechanism of the alloy elements with specific amounts and the common characterization of the alloy elements under the process conditions of the invention are as follows:
zirconium Zr: the addition of proper amount of zirconium can obviously improve the heat resistance of aluminum alloy, mainly because the radius of zirconium atom is slightly larger than that of aluminum atom, zirconium diffuses in aluminum in a replacement mode, the diffusion activation energy is high, and fine Al is precipitated to the crystallization grain boundary 3 Zr phase, which is not easy to gather and grow up, has high stability, can prevent recrystallization, can still effectively pin dislocation and grain boundary at higher temperature, and prevent deformation and intragranular and grain boundary sliding, so that creep resistance is improved, and heat resistance of aluminum alloy is improved.
Cerium (lanthanum) (Ce (La)): according to the invention, one of La, ce or La-Ce mixed rare earth is added, so that the microstructure can be modified, and the shape of the eutectic structure can be effectively improved. On the other hand, these rare earth elements can form a high-melting point compound with Al, impurity elements Fe, si, and the like, and during solidification, the high-melting point compound is first precipitated, providing a large number of heterogeneous nucleation sites. On the other hand, rare earth elements are biased to gather at the solid-liquid interface, so that the component fluctuation near the interface can be increased, and the component supercooling degree of the solid-liquid interface can be increased. Is favorable for non-spontaneous nucleation, thereby achieving the effect of grain refinement. Meanwhile, cerium (lanthanum) can refine coarse micron-sized particles such as AlFeSi in an as-cast structure, change the morphology of the particles and is beneficial to improving the conductivity and the ductility of the alloy.
Beryllium (Be): a small amount of beryllium is added into the aluminum alloy melt, a beryllium oxide protective film is formed on the surface of the melt, slag and degassing can be reduced, the purity is improved, the fluidity is improved, and a casting with high purity and good surface finish is obtained; beryllium can transform brittle intermetallic iron compound crystals in aluminum alloy from coarse needles and layers into fine equiaxed shapes, thereby improving the strength and plasticity of castings; beryllium is added in the heat treatment process, so that the age hardening process of the aluminum alloy can be promoted, and the alloy strength is improved.
Boron (B): among the many influencing factors, chemical components are the most basic factors influencing the conductivity of aluminum conductors, so reducing the influence of impurity elements on the conductivity is a key to improving the conductivity of aluminum conductors. The impurity element, if present in the solute atomic state, has a greater influence on the conductivity. The boration treatment is an effective method for reducing the content of harmful impurities in the aluminum alloy conductor material, namely, after a certain amount of B element is added into the aluminum alloy, the B element can react with transitional impurity elements Cr, mn, V, ti and the like to enable the B element to be converted from a solute atom state to a compound state and deposited at the bottom of a melt, so that the conductivity of the aluminum alloy is improved.
Silicon (Si): silicon is one of main impurity elements in industrial aluminum, si can react with Al, fe and RE elements to generate a second phase, so that lattice distortion is reduced, and the silicon-aluminum alloy conductor material has beneficial effects on conductivity, mechanical property and heat resistance.
Iron (Fe): aluminum contains a certain amount of iron, which is a major impurity in industrial aluminum. Iron is detrimental to the mechanical properties of cast aluminum because it usually occurs as coarse primary crystals or as aluminum-iron-silicon compounds, which to some extent increase the strength of aluminum but decrease the ductility of aluminum. Research has shown that iron can increase the strength of aluminum conductors without significantly reducing their conductivity. However, it has been shown that too high Fe content in the aluminum conductor can cause a significant increase in resistivity in practical production, so that attention should be paid to controlling the Fe content.
Under the preparation process, the heat resistance of the alloy is improved after Zr element is added, al3Zr phase is generated after long-time high-temperature heat treatment, lattice distortion is reduced, and the strength and conductivity of the alloy are improved on the premise of ensuring heat resistance; ce (La) and Be form high-melting-point compounds with Al, impurity elements Fe, si and the like, so that the solid solubility of Fe and Si elements in the alloy can Be reduced, coarse micron-sized particles such as AlFeSi and the like in an as-cast structure are thinned, and the mechanical property and the electric conductivity of the alloy are improved; meanwhile, oxide inclusion is reduced by adding Be element, the quality of aluminum alloy liquid is improved, the aging precipitation process of Al3Zr is accelerated, and the strength and the conductivity of the aluminum alloy are improved; the conductivity is improved to be more than 61.5% IACS on the basis of ensuring the strength and the heat resistance. Through reasonable matching of the component formula and the preparation process parameters, the prepared super heat-resistant aluminum alloy monofilament has the conductivity of more than or equal to 61.5 percent IACS (20 ℃), the tensile strength of more than or equal to 160MPa, the elongation of more than or equal to 2.0 percent and the residual rate of the room temperature strength after heat preservation for 1 hour at 280 ℃ of more than or equal to 90 percent.
Detailed Description
The claims of the invention have two independent claims: the technical scheme for realizing the technical purpose of the invention is as follows:
the alloy monofilament comprises the following alloy elements in percentage by mass: 0.2 to 0.4 percent of Zr, 0.2 to 0.3 percent of Ce (La), 0.2 to 0.4 percent of Be, 0.02 to 0.03 percent of B, less than or equal to 0.06 percent of Si, less than or equal to 1.5 percent of Fe, and the balance of aluminum content and unavoidable other trace impurities.
The independent claim of the product has two technical characteristics, namely: the composition and the properties of the resulting product.
The preparation method comprises the following steps:
(1) Smelting: selecting an industrial pure aluminum ingot with purity more than or equal to 99.7%, and adding the industrial pure aluminum ingot into a smelting furnace, wherein the smelting temperature is 730-750 ℃; after pure aluminum is completely melted, adding Al-B intermediate alloy at 730-750 ℃ for boration treatment; adding Al-Ce (Al-La) intermediate alloy or La-Ce mixed rare earth and Al-Be intermediate alloy at 730-750 ℃, stirring for 10-15 min after complete melting, and keeping the temperature and standing for 20-30 min.
(2) Refining: blowing nitrogen (N2) at 710-720 ℃ for 10-15 min, and carrying out heat preservation and standing for 10-20 min for slag skimming.
(3) Casting: pouring the aluminum alloy liquid into a metal mold preheated at the temperature of between 250 and 300 ℃ at the temperature of between 690 and 710 ℃ to cast an aluminum ingot with the cross section of 20 multiplied by 20 mm.
(4) Rolling: the aluminum ingot is rolled after being kept at the temperature of 510-530 ℃ for 1-3 hours, and is rolled into an aluminum alloy round rod with the diameter of 9.5mm after 7 times of rolling, and is kept at the temperature of 400-450 ℃ for 20-40 hours.
(5) Drawing: and drawing the aluminum alloy round rod cooled to room temperature through multiple passes to obtain the aluminum alloy monofilament with the diameter of 3-4 mm.
(6) Annealing: the monofilament is air cooled after heat preservation for 1 to 4 hours at the temperature of 100 to 140 ℃.
The solutions of the two independent claims are each described in detail below by means of the following specific examples. Unless otherwise indicated, the percentages in the present invention are mass percentages.
Example 1
The high-conductivity super heat-resistant aluminum alloy monofilament material comprises the following components in percentage by mass:
(1) Smelting: selecting an industrial pure aluminum ingot with purity more than or equal to 99.7%, and adding the industrial pure aluminum ingot into a smelting furnace, wherein the smelting temperature is 750 ℃; after the pure aluminum is completely melted, adding Al-B intermediate alloy at 750 ℃ for boration treatment; adding Al-Ce intermediate alloy and Al-Be intermediate alloy at 750 ℃, stirring for 15min after complete melting, and keeping the temperature and standing for 30min.
(2) Refining: nitrogen (N) was blown at 720 c 2 ) Blowing for 15min, keeping the temperature and standing for 20min, and then skimming.
(3) Casting: the aluminum alloy liquid is poured into a metal mold preheated at 300 ℃ at 710 ℃ to be cast into an aluminum ingot with the cross section of 20 multiplied by 20 mm.
(4) Rolling: the aluminum ingot is rolled after heat preservation for 1h at 530 ℃, and is rolled into an aluminum alloy round rod with the diameter of 9.5mm after 7 times of rolling, and then the aluminum ingot is heat-preserved for 20h at 450 ℃.
(5) Drawing: and drawing the aluminum alloy round rod cooled to room temperature for multiple times to obtain the phi 4mm aluminum alloy monofilament.
(6) Annealing: the monofilaments were air-cooled after being kept at 140℃for 1 h.
The prepared super heat-resistant aluminum alloy monofilament has the conductivity of 61.5% IACS (20 ℃), the tensile strength of 172MPa, the elongation of 2.0%, and the room-temperature strength residual rate of 95% after heat preservation for 1h at 280 ℃.
Example 2
The high-conductivity super heat-resistant aluminum alloy monofilament material comprises the following components in percentage by mass:
(1) Smelting: selecting an industrial pure aluminum ingot with purity more than or equal to 99.7%, and adding the industrial pure aluminum ingot into a smelting furnace, wherein the smelting temperature is 730 ℃; after the pure aluminum is completely melted, adding Al-B intermediate alloy at 730 ℃ for boration treatment; adding Al-La intermediate alloy and Al-Be intermediate alloy at 730 ℃, stirring for 10min after complete melting, and keeping the temperature and standing for 20min.
(2) Refining: nitrogen (N) was blown at 710 ℃ 2 ) Blowing for 10min, keeping the temperature and standing for 10min, and removing slag.
(3) Casting: pouring the aluminum alloy liquid into a metal mold preheated at the temperature of 250 ℃ at the temperature of 690 ℃ to obtain an aluminum ingot with the cross section of 20 multiplied by 20 mm.
(4) Rolling: the aluminum ingot is rolled after being insulated for 3 hours at 510 ℃, and is rolled into an aluminum alloy round rod with the diameter of 9.5mm after 7 times of rolling, and then is insulated for 40 hours at 400 ℃.
(5) Drawing: and drawing the aluminum alloy round rod cooled to room temperature for multiple times to obtain the phi 3mm aluminum alloy monofilament.
(6) Annealing: the monofilaments were air-cooled after being kept at 100℃for 4 hours.
The prepared super heat-resistant aluminum alloy monofilament has the conductivity of 61.8 percent IACS (20 ℃), the tensile strength of 160MPa, the elongation of 2.5 percent and the room-temperature strength residual rate of 90 percent after heat preservation for 1 hour at 280 ℃.
Example 3
The high-conductivity super heat-resistant aluminum alloy monofilament material comprises the following components in percentage by mass:
(1) Smelting: selecting an industrial pure aluminum ingot with purity more than or equal to 99.7%, and adding the industrial pure aluminum ingot into a smelting furnace, wherein the smelting temperature is 740 ℃; after the pure aluminum is completely melted, adding Al-B intermediate alloy at 740 ℃ for boration treatment; adding La-Ce mixed rare earth and Al-Be intermediate alloy at 740 ℃, stirring for 10min after complete melting, and keeping the temperature and standing for 25min.
(2) Refining: nitrogen (N) was blown at 715 deg.c 2 ) Blowing for 10min, keeping the temperature and standing for 15min, and then skimming.
(3) Casting: the aluminum alloy liquid is poured into a metal mold preheated at 280 ℃ at 700 ℃ to be cast into an aluminum ingot with the cross section of 20 multiplied by 20 mm.
(4) Rolling: the aluminum ingot is rolled after being kept at 520 ℃ for 2 hours, and is rolled into an aluminum alloy round rod with the diameter of 9.5mm after 7 times of rolling, and then is kept at 420 ℃ for 30 hours.
(5) Drawing: the aluminum alloy round rod cooled to room temperature is subjected to multi-pass drawing to obtain the aluminum alloy monofilament with the diameter of 3.84 mm.
(6) Annealing: the monofilaments were air-cooled after being kept at 110℃for 3 hours.
The prepared super heat-resistant aluminum alloy monofilament has the conductivity of 61.6 percent IACS (20 ℃), the tensile strength of 168MPa, the elongation of 2.1 percent and the room-temperature strength residual rate of 92 percent after heat preservation for 1h at 280 ℃.
Example 4
The high-conductivity super heat-resistant aluminum alloy monofilament material comprises the following components in percentage by mass:
(1) Smelting: selecting an industrial pure aluminum ingot with the purity of more than or equal to 99.7 percent, and adding the industrial pure aluminum ingot into a smelting furnace, wherein the smelting temperature is 735 ℃; adding Al-B intermediate alloy to carry out boride treatment after pure aluminum is completely melted at 735 ℃; adding Al-La intermediate alloy and Al-Be intermediate alloy at 735 ℃, stirring for 12min after complete melting, and keeping the temperature and standing for 25min.
(2) Refining: nitrogen (N) was blown at 720 c 2 ) Blowing for 15min, keeping the temperature and standing for 10min, and then skimming.
(3) Casting: the aluminum alloy liquid is poured into a metal mold preheated at 260 ℃ at 705 ℃ to be cast into an aluminum ingot with the cross section of 20 multiplied by 20 mm.
(4) Rolling: the aluminum ingot is rolled after heat preservation for 2 hours at 525 ℃, and is rolled into an aluminum alloy round rod with the diameter of 9.5mm after 7 times of rolling, and then the aluminum ingot is heat-preserved for 25 hours at 440 ℃.
(5) Drawing: and drawing the aluminum alloy round rod cooled to room temperature for multiple times to obtain the aluminum alloy monofilament with the diameter of 3.5 mm.
(6) Annealing: the monofilaments were air-cooled after being kept at 120℃for 2 h.
The prepared super heat-resistant aluminum alloy monofilament has the conductivity of 61.6% IACS (20 ℃), the tensile strength of 165MPa, the elongation of 2.4% and the room-temperature strength residual rate of 91% after heat preservation for 1h at 280 ℃.
Example 5
The high-conductivity super heat-resistant aluminum alloy monofilament material comprises the following components in percentage by mass:
(1) Smelting: selecting an industrial pure aluminum ingot with the purity of more than or equal to 99.7 percent, and adding the industrial pure aluminum ingot into a smelting furnace, wherein the smelting temperature is 745 ℃; adding Al-B intermediate alloy at 745 ℃ for boride treatment after pure aluminum is completely melted; adding Al-Ce intermediate alloy and Al-Be intermediate alloy at 745 ℃, stirring for 12min after complete melting, and keeping the temperature and standing for 25min.
(2) Refining: nitrogen (N) was blown at 710 ℃ 2 ) Blowing time is 10min, and heat preservation is staticAnd (5) slagging off after placing for 20min.
(3) Casting: the aluminum alloy liquid is poured into a metal mold preheated at the temperature of 250 ℃ at the temperature of 695 ℃ to be cast into an aluminum ingot with the cross section of 20 multiplied by 20 mm.
(4) Rolling: the aluminum ingot is rolled after being kept at 515 ℃ for 3 hours, and is rolled into an aluminum alloy round rod with the diameter of 9.5mm after 7 times of rolling, and then is kept at 410 ℃ for 35 hours.
(5) Drawing: and drawing the aluminum alloy round rod cooled to room temperature for multiple times to obtain the aluminum alloy monofilament with the diameter of 3.3 mm.
(6) Annealing: the monofilaments were air-cooled after being kept at 130℃for 2 h.
The prepared super heat-resistant aluminum alloy monofilament has the conductivity of 61.7% IACS (20 ℃), the tensile strength of 163MPa, the elongation of 2.2% and the room-temperature strength residual rate of 90% after heat preservation for 1h at 280 ℃.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the scope of the claims.
Claims (11)
1. The high-conductivity super heat-resistant aluminum alloy monofilament material is characterized by comprising the following alloy elements in percentage by mass: 0.2 to 0.4 percent of Zr, 0.2 to 0.3 percent of Ce (La), 0.2 to 0.4 percent of Be, 0.02 to 0.03 percent of B, less than or equal to 0.06 percent of Si, less than or equal to 1.5 percent of Fe, and the balance of aluminum content and unavoidable impurities.
2. The high conductivity super heat resistant aluminum alloy monofilament material of claim 1, wherein: the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: zr:0.40%, ce:0.30%, be 0.40%, B:0.03%, si:0.06%, fe:1.50% of aluminum and the balance of unavoidable impurities.
3. The high conductivity super heat resistant aluminum alloy monofilament material of claim 1, wherein: the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: zr:0.20%, la:0.20%, la:0.20%, be 0.20%, B0.02%, si:0.06%, fe:1.00% of aluminum and the balance of unavoidable impurities.
4. The high conductivity super heat resistant aluminum alloy monofilament material of claim 1, wherein: the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: zr:0.30%, ce+La:0.15%, be 0.30%, B:0.02%, si:0.05%, fe:1.2% of aluminum and the balance of unavoidable impurities.
5. The high conductivity super heat resistant aluminum alloy monofilament material of claim 1, wherein: the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: zr:0.25%, la:0.27%, be 0.35%, B0.025%, si:0.04%, fe:0.9%, the balance of aluminum content and unavoidable other impurities.
6. The high conductivity super heat resistant aluminum alloy monofilament material of claim 1, wherein: the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: zr:0.35%, ce:0.22%, be 0.25%, B0.03%, si:0.05%, fe:1.1% of aluminum and the balance of unavoidable impurities.
7. The high conductivity super heat resistant aluminum alloy monofilament material of claim 1, wherein: the aluminum alloy monofilament has conductivity not less than 61% IACS, tensile strength not less than 160MPa, elongation not less than 2%, and room temperature strength residual rate not less than 90% after heat preservation at 280 ℃ for 1 h.
8. A method for preparing the high-conductivity super heat-resistant aluminum alloy monofilament material as claimed in any one of claims 1 to 7, which is characterized in that: the method comprises the following steps:
smelting: selecting an industrial pure aluminum ingot with purity more than or equal to 99.7%, adding the industrial pure aluminum ingot into a smelting furnace, and adding intermediate alloy for boride treatment after pure aluminum is completely melted; adding intermediate alloy or mixed rare earth, stirring for 10-15 min after complete melting, and keeping the temperature and standing for 20-30 min;
refining: blowing nitrogen at 710-720 ℃ for 10-15 min, keeping the temperature and standing for 10-20 min, and then skimming;
casting: pouring the aluminum alloy liquid into a preheated metal mold at 690-710 ℃ to cast an aluminum ingot.
9. The method as recited in claim 8, wherein: wherein the smelting temperature is 730-750 ℃.
10. The method as recited in claim 8, wherein: wherein the preheating temperature is 250-300 ℃.
11. The method as recited in claim 8, wherein: the method further comprises the steps of:
rolling: the aluminum ingot is rolled after being insulated for 1 to 3 hours at the temperature of 510 to 530 ℃, and is insulated for 20 to 40 hours at the temperature of 400 to 450 ℃ after being rolled into an aluminum alloy round rod for multiple passes;
drawing: the aluminum alloy round rod cooled to room temperature is subjected to multi-pass drawing to obtain aluminum alloy monofilaments;
annealing: the monofilament is air cooled after heat preservation for 1 to 4 hours at the temperature of 100 to 140 ℃.
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