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High-strength, high-conductivity, heat-resistant aluminum alloy wire with large rare earth content and preparation method thereof

An aluminum alloy wire, aluminum alloy technology, applied in the direction of metal/alloy conductors, conductors, conductive materials, etc., can solve problems such as the decrease of electrical conductivity, and achieve the effect of inhibiting recrystallization and softening

Active Publication Date: 2019-11-29
SHANGHAI JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solid solution of elements will lead to a sharp drop in conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The composition of the heat-resistant aluminum alloy wire prepared in this embodiment is: 0.2% of zirconium Zr, 2% of lanthanum La, 2% of cerium Ce, 2% of yttrium Y, 0.10% of iron Fe, and 0.10% of silicon Si, The content of other impurity elements is ≤0.10%, and the rest is aluminum Al.

[0034] The preparation method of the above-mentioned heat-resistant aluminum alloy wire consists of the following steps:

[0035] Select Al 99.7% industrial pure aluminum and place it in a smelting furnace to melt into molten aluminum, and raise the temperature of the molten aluminum to 720-750°C;

[0036] According to the formula Zr 0.2%, La 2%, Ce2%, Y2%, Fe0.1%, Si0.10%, respectively weigh the master alloy and put it into the aluminum liquid. Use graphite rods to stir slowly and fully; after degassing and slag removal, the aluminum alloy liquid is obtained, which enters the continuous casting and rolling production line at 750°C to 800°C, and is cast into aluminum alloy cast bars;

...

Embodiment 2

[0041] The thermal aluminum alloy wire prepared in this embodiment has the following components: 1% zirconium Zr, 2% lanthanum La, 2% cerium Ce, 4% yttrium Y, 0.10% iron Fe, 0.10% silicon Si, and others The content of impurity elements is ≤0.10%, and the rest is aluminum.

[0042] Select Al 99.7% industrial pure aluminum and place it in a smelting furnace to melt into molten aluminum, and raise the temperature of the molten aluminum to 720°C to 750°C;

[0043] According to the formula Zr 1%, La 2%, Ce2%, Y4%, Fe0.1%, Si0.1%, respectively weigh the master alloy and put it into the molten aluminum; Use graphite rods to stir slowly and fully; after degassing and slag removal, the aluminum alloy liquid is obtained, which enters the continuous casting and rolling production line at 750 ° C to 800 ° C, and is cast into aluminum alloy casting rods;

[0044] The aluminum alloy cast bar is hot-rolled on a rolling mill, and the rolling temperature is 500-530°C, and it is produced into ...

Embodiment 3

[0048] The composition of the heat-resistant aluminum alloy wire prepared in this embodiment is: 0.5% of zirconium Zr, 2.5% of lanthanum La, 2.5% of cerium Ce, 3.5% of yttrium Y, 0.15% of iron Fe, and 0.05% of silicon Si, The content of other impurity elements is ≤0.10%, and the rest is aluminum.

[0049] The preparation method refers to the above-mentioned Example 1.

[0050] The composition of the aluminum alloy wire obtained in this embodiment is different from that of traditional heat-resistant aluminum, and 6-10 wt.% of rare earth elements are added. Due to the formation of eutectic rare earth compounds with high melting point between rare earth elements (La, Ce, Y) and Al, it can effectively pin the grain boundary and inhibit recrystallization softening at high temperature. The tensile strength of the tested single wire reaches 270MPa, and the conductivity reaches 60% IACS.

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Abstract

The invention provides a high-rare-earth-content high-intensity heat-resistance aluminum alloy conducting wire and a preparation method thereof. The conducting wire is prepared from the following elements in percentage by weight: 0.1 to 2 percent of Zr, 2 to 5 percent of La, 2 to 6 percent of Ce, 2 to 6 percent of Y, 0.05 to 0.20 percent of Fe, 0.05 to 0.10 percent of Si, smaller than or equal to0.10 percent of other impurity elements and the balance of aluminum. The invention also provides the preparation method of the conducting wire. The tensile intensity of the heat-resistance aluminum alloy conducting wire reaches 320 MPa; the conductivity can reach 60-percent IACS; the long-time operation temperature can reach 300 DEG C; the conducting wire can withstand the 1h heating checking operation at 280 DEG C; the intensity ascends instead of descending. After the 1h heating checking operation at 400 DEG C, the intensity residue rate reaches higher than 97 percent.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy wires, in particular to a high-strength, high-conductivity and heat-resistant aluminum alloy wire used in overhead power transmission and transformation lines and a manufacturing method thereof. Background technique [0002] With the rapid development of my country's national economy, transmission lines are developing in the direction of high voltage, long distance and large capacity. At present, the heat-resistant wires used in my country's urban and rural power transmission and transformation lines are generally twisted from ordinary heat-resistant aluminum alloy single wires and ordinary galvanized steel wires. This kind of ordinary heat-resistant wire generally has a long-term operating temperature of no more than 150°C. Compared with ordinary wires, it can only increase the ampacity by 1.6 times, and the capacity is not greatly improved, and the conductivity is below 60% IACS. The cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C1/03C22F1/04H01B1/02
CPCC22C1/026C22C1/03C22C21/00C22F1/04H01B1/023
Inventor 高海燕王朦朦王俊尤伟任顾孙望李敏张驰
Owner SHANGHAI JIAOTONG UNIV
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