CN117701957A - High-conductivity high-strength aluminum alloy monofilament material and preparation method thereof - Google Patents
High-conductivity high-strength 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 100
- 239000000463 material Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 49
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000003723 Smelting Methods 0.000 claims abstract description 25
- 239000012535 impurity Substances 0.000 claims abstract description 18
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 14
- 238000004321 preservation Methods 0.000 claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 12
- 238000000137 annealing Methods 0.000 claims abstract description 10
- 238000007670 refining Methods 0.000 claims abstract description 9
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 7
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 49
- 239000000956 alloy Substances 0.000 claims description 49
- 239000007788 liquid Substances 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 238000005885 boration reaction Methods 0.000 claims description 9
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- 238000007664 blowing Methods 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
- 238000003825 pressing Methods 0.000 claims description 3
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- 230000007547 defect Effects 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 229910052761 rare earth metal Inorganic materials 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 6
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- 150000002910 rare earth metals Chemical class 0.000 description 4
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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 229910019752 Mg2Si Inorganic materials 0.000 description 3
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- 229910021365 Al-Mg-Si alloy Inorganic materials 0.000 description 2
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- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
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- 229910018464 Al—Mg—Si Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a high-conductivity high-strength aluminum alloy monofilament material and a preparation method thereof, wherein the aluminum alloy monofilament comprises the following elements in percentage by mass: 0.4 to 0.6 percent of Mg, 0.4 to 0.50 percent of Si, 0.3 to 0.4 percent of Ce, 0.02 to 0.04 percent of B, and the balance of aluminum content and unavoidable other trace impurities. The conductivity of the obtained high-conductivity high-strength aluminum alloy monofilament is more than or equal to 57 percent IACS (20 ℃), the tensile strength is more than or equal to 300MPa, the elongation is more than or equal to 3.0 percent, and the residual rate of the room-temperature strength after heat preservation for 1h at 280 ℃ is more than or equal to 90 percent. The preparation method comprises the following steps: smelting, refining, casting, rolling, annealing and drawing. The technical scheme provided by the invention optimizes the manufacturing process of the aluminum alloy energy-saving wire in the prior art, and solves the technical defects of high loss and low safety of the overhead transmission line.
Description
Technical Field
The invention relates to the technical field of wires for overhead transmission lines in the power industry, in particular to a high-conductivity high-strength aluminum alloy monofilament and a preparation method thereof.
Background
Along with the gradual construction of clean low-carbon and safe high-energy-efficiency energy systems and the continuous penetration of the strategy of energy conservation and emission reduction, higher requirements are put forward on the safe operation and loss level of the power grid.
Overhead conductors are important carriers for power transmission of power grids, and the comprehensive performance of overhead conductors directly influences the safety of power transmission and the transmission efficiency of energy sources. The conductivity of the active high-strength aluminum alloy monofilament is 52.5-53% IACS, the conductivity of the similar products reaches 55.25% IACS or more, the power transmission line loss of the similar products is increased by 4% or more, the power loss is large, and the large-scale application in overhead power transmission lines is severely restricted.
Based on the above problems, there is a need to obtain high-conductivity and high-strength aluminum alloy monofilament materials and a preparation process, which provide technical support for preparing high-performance aluminum alloy energy-saving wires, further improve the manufacturing level of the aluminum alloy energy-saving wires, and meet the power transmission construction requirements of overhead power transmission lines for low loss and high safety.
Disclosure of Invention
The invention aims to develop a high-conductivity high-strength aluminum alloy monofilament by taking an electrical aluminum ingot with the purity of 99.7% as a raw material, and solve the technical problem that the conductivity of the existing high-strength aluminum alloy monofilament and a lead product thereof is low. The microstructure and the comprehensive performance of the Al-Mg-Si alloy are improved mainly by adding trace elements Ce and B, and the high-conductivity high-strength aluminum alloy monofilament material with the conductivity of more than or equal to 57 percent IACS (20 ℃), the tensile strength of more than or equal to 300MPa and the elongation of more than or equal to 3.0 percent is developed.
In order to achieve the technical purpose, the technical scheme provided by the invention is as follows:
in a high conductivity high strength aluminum alloy monofilament material, the improvement wherein the aluminum alloy monofilament comprises the following alloying elements in mass percent: 0.4 to 0.6 percent of Mg, 0.4 to 0.50 percent of Si, 0.3 to 0.4 percent of Ce, 0.02 to 0.04 percent of B, and the balance of aluminum content and unavoidable other trace impurities.
Preferably, the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: 0.6% of Mg, 0.4% of Si, 0.4% of Ce, 0.04% of B, and the balance of aluminum and unavoidable other trace impurities.
Preferably, the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: 0.5% of Mg, 0.5% of Si, 0.3% of Ce, 0.02% of B, and the balance of aluminum and unavoidable other trace impurities.
Preferably, the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: 0.5% of Mg, 0.4% of Si, 0.35% of Ce, 0.03% of B, and the balance of aluminum and unavoidable other trace impurities.
Preferably, the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: 0.55% of Mg, 0.45% of Si, 0.3% of Ce, 0.02% of B, and the balance of aluminum and unavoidable other trace impurities.
Preferably, the aluminum alloy monofilament is made of the following alloy elements in percentage by weight: 0.45% of Mg, 0.5% of Si, 0.38% of Ce, 0.03% of B, and the balance of aluminum and unavoidable other trace impurities.
Preferably, the conductivity is more than or equal to 57 percent IACS (20 ℃), the tensile strength is more than or equal to 300MPa, the elongation is more than or equal to 3.0 percent, and the room temperature strength residual rate after heat preservation at 280 ℃ for 1h is more than or equal to 90 percent.
Based on the same inventive concept, the invention also provides a preparation method of the high-conductivity high-strength aluminum alloy monofilament, which comprises the following steps:
(1) Smelting: an electrical aluminum ingot with the purity of 99.7 percent is selected and added into a smelting furnace, and the smelting temperature is 740-760 ℃; after pure aluminum is completely melted, adding Al-B intermediate alloy at 740-760 ℃ for boration treatment; adding pure Mg, al-Si intermediate alloy and Al-Ce intermediate alloy at 740-760 ℃, stirring for 10-15 min after complete melting, and standing for 15-20 min;
(2) Refining: blowing N2 at 700-720 ℃ for 10-15 min, standing for 20-30 min, and then skimming;
(3) Casting: pouring the aluminum alloy liquid into a metal mold at 700-720 ℃ to obtain an ingot casting with the thickness of 22 multiplied by 200 mm;
(4) Rolling: preserving the temperature of the cast ingot at 510-530 ℃ for 1-3 h, and rolling and pressing into an aluminum alloy round rod with the diameter of 9.5mm through 7 times;
(5) Drawing: drawing the aluminum alloy round rod with the diameter of 9.5mm for 8-12 times to obtain a monofilament with the diameter of 3-4 mm;
(6) Annealing: the aluminum alloy round rod is insulated for 3 to 10 hours at the temperature of 165 to 180 ℃.
Preferably, the step (6) includes:
drawing: the aluminum alloy round rod is subjected to heat preservation for 3-10 hours within the temperature range of 165-180 ℃ and then is drawn to prepare aluminum alloy monofilaments with phi 3-4mm, and the drawing deformation is 1.2-1.3;
the aluminum alloy monofilament is insulated for 0.5-2h at the temperature of 90-120 ℃.
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:
mg (magnesium): magnesium has obvious strengthening effect on aluminum, and the tensile strength of the obtained product is increased by about 34MPa when the magnesium is added by 1 percent. Mg2Si strengthening phases in the Al-Mg-Si based alloy, which strengthen the alloy; meanwhile, the Mg2Si strengthening phase can also have a certain influence on the conductivity of the alloy. The conductivity of the alloy is generally higher and strength is lower when the Mg content is lower, but the alloy also has high conductivity when the Mg is moderately excessive and the Mg2Si is sufficiently precipitated by heat treatment.
Si (silicon): silicon, one of the most common elements of aluminum alloys, can improve the casting properties and welding fluidity of the aluminum alloys, and also can give higher mechanical properties to the aluminum alloys because it forms some compounds in the alloys, which allows the aluminum alloys to be heat-treated for strengthening.
Cerium (Ce): the rare earth Ce element is added in the invention, which can play a role in modifying microstructure and can effectively improve the shape of eutectic structure. 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 aggregated at the solid-liquid interface, so that the component fluctuation near the interface can be increased, the component supercooling degree of the solid-liquid interface is increased, the non-spontaneous nucleation is facilitated, and the effect of grain refinement is achieved. Meanwhile, cerium 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.
B (boron): the boration treatment is an effective method for reducing the impurity content of the aluminum alloy, and 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 convert the solid solution state into the compound state and deposit the compound state at the bottom of the melt, so that the conductivity of the aluminum alloy is improved.
According to the invention, the rare earth element Ce is added into the Al-Mg-Si alloy, and the rare earth element Ce is aggregated at a solid-liquid interface in the solidification process, so that the component fluctuation near the interface can be increased, the component supercooling degree of the solid-liquid interface is increased, the non-spontaneous nucleation is facilitated, and the effect of grain refinement is achieved; the rare earth Ce element and Al, fe, si and other elements form a compound with high melting point, coarse micron-sized particles such as AlFeSi and the like in an as-cast structure are thinned, the morphology of an AlFeSi phase is changed, the size of the AlFeSi phase is reduced, and the conductivity and the ductility of the alloy are improved. However, the addition of the rare earth Ce element does not change the aging precipitation behavior of the alloy, and Mg is formed in the later annealing process 2 The Si precipitates out of the phase, improving the strength of the alloy.
Compared with similar high-conductivity high-strength aluminum alloy monofilaments, the rare earth Ce element with lower price is added into the common industrial aluminum ingot with the purity of 99.7%, and the high-conductivity high-strength aluminum alloy monofilaments prepared by reasonably matching components with preparation process parameters have the conductivity of more than or equal to 57 percent IACS (20 ℃), the tensile strength of more than or equal to 300MPa, the elongation of more than or equal to 3.0 percent and the residual rate of room-temperature strength of more than or equal to 90 percent after heat preservation for 1 hour at 280 ℃.
Detailed Description
The claims of the invention have two independent claims: a high-conductivity super heat-resistant aluminum alloy monofilament material and a preparation method thereof are provided:
a high-conductivity high-strength aluminum alloy monofilament material, which is characterized in that the alloy monofilament comprises the following alloy elements in percentage by mass: 0.4 to 0.6 percent of Mg, 0.4 to 0.50 percent of Si, 0.3 to 0.4 percent of Ce, 0.02 to 0.04 percent of B, 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: an electrical aluminum ingot with the purity of 99.7 percent is selected and added into a smelting furnace, and the smelting temperature is 740-760 ℃; after pure aluminum is completely melted, adding Al-B intermediate alloy at 740-760 ℃ for boration treatment; adding pure Mg, al-Si intermediate alloy and Al-Ce intermediate alloy at 740-760 ℃, stirring for 10-15 min after complete melting, and standing for 15-20 min;
(2) Refining: blowing N2 at 700-720 ℃ for 10-15 min, standing for 20-30 min, and then skimming;
(3) Casting: pouring the aluminum alloy liquid into a metal mold at 700-720 ℃ to obtain an ingot casting with the thickness of 22 multiplied by 200 mm;
(4) Rolling: preserving the temperature of the cast ingot at 510-530 ℃ for 1-3 h, and rolling and pressing into an aluminum alloy round rod with the diameter of 9.5mm through 7 times;
(5) Drawing: drawing the aluminum alloy round rod with the diameter of 9.5mm for 8-12 times to obtain a monofilament with the diameter of 3-4 mm;
(6) Annealing: the aluminum alloy round rod is insulated for 3 to 10 hours at the temperature of 165 to 180 ℃.
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
A high-conductivity high-strength aluminum alloy monofilament material comprises the following components in percentage by weight:
(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 pure Mg, al-Si intermediate alloy and Al-Ce intermediate alloy at 740 ℃, stirring for 15min after complete melting, and standing for 20min.
(2) Refining: nitrogen (N) was blown at 700 c 2 ) Blowing for 10min, keeping the temperature and standing for 30min, and removing slag.
(3) Casting: casting aluminum alloy liquid into a metal mold at 720 ℃ to obtain aluminum ingots with the cross sections of 22 multiplied by 200 mm.
(4) Rolling: the aluminum ingot is rolled after being kept at 510 ℃ for 3 hours, and is rolled into an aluminum alloy round rod with the diameter of 9.5mm through 7 times.
(5) Drawing: the aluminum alloy round rod cooled to room temperature is subjected to multi-pass drawing to obtain an aluminum alloy monofilament with phi 4 mm;
(6) Annealing: the aluminum alloy round rod is insulated for 3 hours at 165 ℃.
The high-conductivity high-strength aluminum alloy monofilament prepared by the method has the conductivity of 57% IACS (20 ℃), the tensile strength of 310MPa and the elongation of 3.0%. The residual rate of the room temperature strength after heat preservation for 1h at 280 ℃ is 95 percent.
Example 2
A high-conductivity high-strength aluminum alloy monofilament material comprises the following components in percentage by weight:
(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 pure Mg, al-Si intermediate alloy and Al-Ce intermediate alloy at 750 ℃, stirring for 10min after complete melting, and standing for 15min;
(2) Refining: nitrogen (N) was blown at 710 ℃ 2 ) Blowing for 15min, keeping the temperature and standing for 20min, and then skimming;
(3) Casting: pouring the aluminum alloy liquid into a metal mold at 700 ℃ to form an aluminum ingot with the cross section of 22 multiplied by 200 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 through 7 times;
(5) Drawing: the aluminum alloy round rod cooled to room temperature is subjected to multi-pass drawing to obtain an aluminum alloy monofilament with the diameter of 3 mm;
(6) Annealing: the aluminum alloy round rod is insulated for 6 hours at 175 ℃.
The high-conductivity high-strength aluminum alloy monofilament prepared by the method has the conductivity of 57.3 percent IACS (20 ℃), the tensile strength of 300MPa and the elongation of 3.5 percent. The residual rate of the room temperature strength after heat preservation for 1h at 280 ℃ is 90 percent.
Example 3
A high-conductivity high-strength aluminum alloy monofilament material comprises the following components in percentage by weight:
(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 760 ℃; after the pure aluminum is completely melted, adding Al-B intermediate alloy at 760 ℃ for boration treatment; adding pure Mg, al-Si intermediate alloy and Al-Ce intermediate alloy at 760 ℃, stirring for 10min after complete melting, and standing for 15min;
(2) Refining: nitrogen (N) was blown at 720 c 2 ) Blowing for 15min, keeping the temperature and standing for 30min, and then skimming;
(3) Casting: pouring aluminum alloy liquid into a metal mold at 710 ℃ to form an aluminum ingot with the cross section of 22 multiplied by 200 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 through 7 times;
(5) Drawing: the aluminum alloy round rod cooled to room temperature is subjected to multi-pass drawing to obtain an aluminum alloy monofilament with the diameter of 3.84 mm;
(6) Annealing: the aluminum alloy round rod is insulated for 3 hours at 180 ℃.
The high-conductivity high-strength aluminum alloy monofilament prepared by the method has the conductivity of 57.2 percent IACS (20 ℃), the tensile strength of 305MPa and the elongation of 3.2 percent. The residual rate of the room temperature strength after heat preservation for 1h at 280 ℃ is 92 percent.
Example 4
A high-conductivity high-strength aluminum alloy monofilament material comprises the following components in percentage by weight:
(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 760 ℃ for boration treatment; adding pure Mg, al-Si intermediate alloy and Al-Ce intermediate alloy at 740 ℃, stirring for 12min after complete melting, and standing for 15min;
(2) Refining: nitrogen (N) was blown at 715 deg.c 2 ) Blowing for 10min, keeping the temperature and standing for 25min, and then skimming;
(3) Casting: pouring the aluminum alloy liquid into a metal mold at 715 ℃ to form an aluminum ingot with the cross section of 22 multiplied by 200 mm;
(4) Rolling: the aluminum ingot is rolled after heat preservation for 1.5h at 525 ℃ and is rolled into an aluminum alloy round rod with the diameter of 9.5mm through 7 passes;
(5) Drawing: the aluminum alloy round rod cooled to room temperature is subjected to multi-pass drawing to obtain an aluminum alloy monofilament with the diameter of 3.6 mm;
(6) Annealing: the aluminum alloy round rod is insulated for 8 hours at 170 ℃.
The high-conductivity high-strength aluminum alloy monofilament prepared by the method has the conductivity of 57.1 percent IACS (20 ℃), the tensile strength of 305MPa and the elongation of 3.1 percent. The residual rate of the room temperature strength after heat preservation for 1h at 280 ℃ is 91 percent.
Example 5
A high-conductivity high-strength aluminum alloy monofilament material comprises the following components in percentage by weight:
(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 760 ℃; after the pure aluminum is completely melted, adding Al-B intermediate alloy at 740 ℃ for boration treatment; adding pure Mg, al-Si intermediate alloy and Al-Ce intermediate alloy at 740 ℃, stirring for 15min after complete melting, and standing for 15min;
(2) Refining: nitrogen (N) was blown at 725 °c 2 ) Blowing for 10min, keeping the temperature and standing for 25min, and then skimming;
(3) Casting: pouring the aluminum alloy liquid into a metal mold at 715 ℃ to form an aluminum ingot with the cross section of 22 multiplied by 200 mm;
(4) Rolling: the aluminum ingot is rolled after being kept at 515 ℃ for 2.5 hours, and is rolled into an aluminum alloy round rod with the diameter of 9.5mm through 7 times;
(5) Drawing: the aluminum alloy round rod cooled to room temperature is subjected to multi-pass drawing to obtain an aluminum alloy monofilament with the diameter of 3.15 mm;
(6) Annealing: the aluminum alloy round rod is insulated for 5 hours at 175 ℃.
The high-conductivity high-strength aluminum alloy monofilament prepared by the method has the conductivity of 57.2 percent IACS (20 ℃), the tensile strength of 302MPa and the elongation of 3.3 percent. The residual rate of the room temperature strength after heat preservation for 1h at 280 ℃ is 90 percent.
Table 1 Table (wt%) of aluminum alloy composition prepared in examples
| Group of | Mg | Si | Ce | B | Al and impurity element |
| Example 1 | 0.6 | 0.4 | 0.4 | 0.04 | Allowance of |
| Example 2 | 0.5 | 0.5 | 0.3 | 0.02 | Allowance of |
| Example 3 | 0.5 | 0.4 | 0.35 | 0.03 | Allowance of |
| Example 4 | 0.55 | 0.45 | 0.3 | 0.02 | Allowance of |
| Example 5 | 0.45 | 0.5 | 0.38 | 0.03 | Allowance of |
Table 2 results of performance test of aluminum alloy monofilaments prepared in examples
As shown in Table 2, the high-conductivity high-strength aluminum alloy monofilament material provided by the invention has obvious advantages in comprehensive performance, particularly has the conductivity of not less than 57% IACS, the tensile strength of not less than 300MPa, the elongation of not less than 3.0%, and the strength residual rate of not less than 90% after heat preservation at 280 ℃ for 1 h.
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 (8)
1. A high-conductivity high-strength aluminum alloy monofilament material, which is characterized in that the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: 0.4 to 0.6 percent of Mg, 0.4 to 0.50 percent of Si, 0.3 to 0.4 percent of Ce, 0.02 to 0.04 percent of B, and the balance of aluminum content and unavoidable other trace impurities.
2. A high conductivity, high strength aluminum alloy monofilament material as claimed in claim 1, wherein: the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: 0.6% of Mg, 0.4% of Si, 0.4% of Ce, 0.04% of B, and the balance of aluminum and unavoidable other trace impurities.
3. A high conductivity, high strength aluminum alloy monofilament material as claimed in claim 1, wherein: the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: 0.5% of Mg, 0.5% of Si, 0.3% of Ce, 0.02% of B, and the balance of aluminum and unavoidable other trace impurities.
4. A high conductivity, high strength aluminum alloy monofilament material as claimed in claim 1, wherein: the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: 0.5% of Mg, 0.4% of Si, 0.35% of Ce, 0.03% of B, and the balance of aluminum and unavoidable other trace impurities.
5. A high conductivity, high strength aluminum alloy monofilament material as claimed in claim 1, wherein: the aluminum alloy monofilament comprises the following alloy elements in percentage by mass: 0.55% of Mg, 0.45% of Si, 0.3% of Ce, 0.02% of B, and the balance of aluminum and unavoidable other trace impurities.
6. A high conductivity, high strength aluminum alloy monofilament material as claimed in claim 1, wherein: the aluminum alloy monofilament is prepared from the following alloy elements in percentage by weight: 0.45% of Mg, 0.5% of Si, 0.38% of Ce, 0.03% of B, and the balance of aluminum and unavoidable other trace impurities.
7. A high conductivity, high strength aluminum alloy monofilament material as claimed in claim 1, wherein: the conductivity is more than or equal to 57 percent IACS (20 ℃), the tensile strength is more than or equal to 300MPa, the elongation is more than or equal to 3.0 percent, and the residual rate of the room temperature strength after heat preservation for 1h at 280 ℃ is more than or equal to 90 percent.
8. A method for preparing the high-conductivity high-strength aluminum alloy monofilament material according to any one of claims 1 to 6, which is characterized in that: the method comprises the following steps:
(1) Smelting: an electrical aluminum ingot with the purity of 99.7 percent is selected and added into a smelting furnace, and the smelting temperature is 740-760 ℃; after pure aluminum is completely melted, adding Al-B intermediate alloy at 740-760 ℃ for boration treatment; adding pure Mg, al-Si intermediate alloy and Al-Ce intermediate alloy at 740-760 ℃, stirring for 10-15 min after complete melting, and standing for 15-20 min;
(2) Refining: blowing N2 at 700-720 ℃ for 10-15 min, standing for 20-30 min, and then skimming;
(3) Casting: pouring the aluminum alloy liquid into a metal mold at 700-720 ℃ to obtain an ingot casting with the thickness of 22 multiplied by 200 mm;
(4) Rolling: preserving the temperature of the cast ingot at 510-530 ℃ for 1-3 h, and rolling and pressing into an aluminum alloy round rod with the diameter of 9.5mm through 7 times;
(5) Drawing: drawing the aluminum alloy round rod with the diameter of 9.5mm for 8-12 times to obtain a monofilament with the diameter of 3-4 mm;
(6) Annealing: the aluminum alloy round rod is insulated for 3 to 10 hours at the temperature of 165 to 180 ℃.
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