High-conductivity creep-resistant aluminium alloy cable conductor containing Hf and Ce and preparation method thereof

A cable conductor, high electrical conductivity technology, applied in the field of aluminum alloy materials, can solve the problems of poor high temperature resistance and creep performance, low electrical conductivity, strength loss, etc., to improve electrical performance and high temperature performance, improve heat resistance. and creep resistance, improve the effect of safety performance

Active Publication Date: 2012-10-31
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The price of copper wire is more expensive, more than three times that of aluminum
Although the elongation rate of the soft pure aluminum conductor is much higher than that of the hard state, its tensile strength is greatly reduced, and its creep resistance is very poor. Potential safety hazards during use
Despite the rapid development of aluminum alloy cables, as wires for construction, there are various problems in the existing aluminum alloy cables: Al-Mg-Si series alloy wires are due to Mg 2 The precipitation strengthening effect of Si phase has high room temperature strength, but due to the 2 Si is

Method used

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  • High-conductivity creep-resistant aluminium alloy cable conductor containing Hf and Ce and preparation method thereof
  • High-conductivity creep-resistant aluminium alloy cable conductor containing Hf and Ce and preparation method thereof
  • High-conductivity creep-resistant aluminium alloy cable conductor containing Hf and Ce and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1:

[0041] Put pure aluminum with a mass fraction of 99.99% into the cupola, melt it into aluminum water at 750 ° C and keep it at 700 ° C, add sodium chloride as a covering agent, and sequentially put in aluminum-iron master alloy, aluminum-copper master alloy, aluminum -Hafnium master alloy, aluminum-boron master alloy and aluminum-cerium master alloy are prepared into an aluminum alloy liquid, and hexachloroethane is added as a refining agent, stirred and slag removed, and poured into a mold at 715°C to 150°C. The content is (mass fraction): Fe 1.1%, Cu 0.1%, Ce 0.02%, Hf 0.01%, B 0.01%, and the rest are Al. After homogenization treatment at 500℃ / 15h, it was cooled to 380℃ with the furnace and extruded in an extrusion die with a mold temperature of 300℃. The extrusion speed was 5m / min, and the extrusion ratio was 25:1. It was drawn at a speed of min, annealed at 250 °C for 2 h, and air-cooled.

Example Embodiment

[0042] Example 2:

[0043] Put pure aluminum with a mass fraction of 99.99% in the cupola, melt it into aluminum water at 900 ° C and keep it at 750 ° C, add mixed salt of sodium chloride, potassium chloride, calcium fluoride and sodium carbonate (mass ratio is 30 :30:25:15) as a covering agent, put in aluminum-iron master alloy, aluminum-copper master alloy, aluminum-hafnium master alloy, aluminum-boron master alloy and aluminum-cerium master alloy in sequence to form an aluminum alloy liquid, add Hexachloroethane is used as a refining agent, stirring and slag removal, pouring from 725 ° C to 200 ° C in a mold, the content of each element is (mass fraction): Fe 0.3%, Cu 0.5%, Ce 0.1%, B 0.05%, Hf 0.2%, the rest is Al. After homogenization at 550°C / 10h, it was cooled to 420°C with the furnace and extruded in an extrusion die with a mold temperature of 420°C. The extrusion speed was 20m / min, and the extrusion ratio was 64:1. It was drawn at a speed of min, annealed at 350 °C ...

Example Embodiment

[0044] Example 3:

[0045] Put pure aluminum with a mass fraction of 99.99% into the cupola, melt it into aluminum water at 850 ° C and keep it at 730 ° C, add a mixed salt of sodium chloride and potassium chloride (mass ratio of 1:1) as a covering agent, Add aluminum-iron master alloy, aluminum-copper master alloy, aluminum-hafnium master alloy, aluminum-boron master alloy and aluminum-cerium master alloy in sequence to prepare aluminum alloy liquid, add hexachloroethane as a refining agent, stir, scrape Slag, poured at 720 ° C to 180 ° C mold, the content of each element is (mass fraction): Fe 0.75%, Cu 0.25%, Ce 0.05%, B 0.03%, Hf 0.1%, and the rest are Al. After homogenization treatment at 530°C / 12h, it was cooled to 400°C with the furnace and extruded in an extrusion die with a mold temperature of 400°C. The extrusion speed was 15m / min, and the extrusion ratio was 36:1. It was drawn at a speed of min, annealed at 320°C for 1.5h, and air-cooled.

[0046] The product perf...

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Abstract

The invention discloses a high-conductivity creep-resistant aluminium alloy cable conductor containing Hf and Ce and a preparation method thereof. The aluminium alloy cable conductor disclosed by the invention is composed of the following constituents in percentage by mass: 0.3-1.1% of Fe, 0.1-0.5% of Cu, 0.01-0.2% of Hf, 0.01-0.05% of B, 0.02-0.1%, and the balance of Al. The preparation method comprises the following steps of: proportioning according to the designed alloy constituents, smelting and pouring, homogenizing-annealing and hot-extruding, cold-drawing and annealing to finally obtain the aluminium alloy cable conductor. The aluminium alloy cable conductor prepared by the preparation method disclosed by the invention has an elongation after fracture being greater than 25%, tensile strength being greater than 110 MPa, and conductivity being 61.0-62.5%. By using the conductor manufactured by the preparation method disclosed by the invention, transmission capacity can be increased and electric energy loss can be reduced due to the introduction of other alloy elements; and moreover, many high-temperature stable phases are distributed on the crystal boundaries and in the crystals of alloys, so that the high-temperature performance and the creep-resistant performance of the alloy conductor can be improved, thus guaranteeing the service life and safety of the conductor.

Description

technical field [0001] The invention discloses a high-conductivity creep-resistant aluminum alloy cable conductor containing Hf and Ce and a preparation method thereof, belonging to the technical field of aluminum alloy materials. Background technique [0002] Aluminum alloy has the advantages of high specific strength, high electrical conductivity, good plasticity, good wear resistance and corrosion resistance, so it has an advantageous position in the field of power transmission. With the development of my country's economy and the improvement of people's living standards, the electricity consumption of residents continues to increase. During the use of wires, the contact points are caused by internal stress due to the instantaneous high temperature (150°C) generated by the connection, and the wires undergo short-term creep. , Under frequent creep action, accidents such as failure of conductor materials and burning of insulating materials outside the conductor will occur. T...

Claims

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Application Information

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IPC IPC(8): H01B1/02H01B13/00C22C21/00C22C21/12C22C1/03C22C1/06C22F1/04C22F1/057
Inventor 易丹青臧冰王斌柳公器刘欢郭磊马凯
Owner CENT SOUTH UNIV
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