A method for improving the hardness of cuw alloy

A technology of hardness and alloy, applied in the field of improving the hardness of CuW alloy, can solve problems such as the inability to meet performance requirements, and achieve the effects of increasing hardness, reducing wear rate and reducing electrical conductivity

Active Publication Date: 2019-05-10
嘉兴如运建筑科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Commercial CuW alloys cannot meet the performance requirements of key materials in high-grade power transmission circuit breakers, disconnectors, etc., especially in the case of frequent breaking. Therefore, improving its performance and life is a difficult problem that researchers must solve

Method used

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  • A method for improving the hardness of cuw alloy
  • A method for improving the hardness of cuw alloy
  • A method for improving the hardness of cuw alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix submicron tungsten powder, copper powder and WS2 according to the mass ratio of 1000:50:3, put them into the mixer, and add tungsten carbide grinding balls according to 1:1 of the total powder mass Mix the powder at a speed of 120r / min for 4 hours. The mechanically mixed powder is bonded, dried, and sieved. The powder is pressed through a cold press mold with a pressing pressure of 350KN and held for 30 seconds to form a blank. The blank formed by pre-pressing , place the copper block on the blank and then sinter at 900°C for 2h and infiltrate at 1320°C for 2h under a hydrogen protective atmosphere. The hardness of the obtained CuW alloy is 198HB, the electrical conductivity is 27MS / m, and the withstand voltage strength is 3.40×10 7 V / M.

Embodiment 2

[0033] Mix submicron tungsten powder, copper powder and WS2 according to the mass ratio of 1000:60:6, put them into the mixer, and add tungsten carbide grinding balls according to 1:1 of the total powder mass Mix the powder at a speed of 120r / min for 4 hours. The mechanically mixed powder is bonded, dried, and sieved. The powder is pressed through a cold pressing mold with a pressing pressure of 400KN and held for 35 seconds to form a blank. The blank formed by pre-pressing , place the copper block on the blank and then sinter at 940°C for 2h and infiltrate at 1350°C for 2h under a hydrogen protective atmosphere. The hardness of the obtained CuW alloy is 218HB, the electrical conductivity is 25MS / m, and the withstand voltage strength is 3.20×10 7 V / M.

[0034] figure 1 It is a CuW alloy structure without lubricating phase WS2, which has spherical W 50 Two types of W powder, granule and production W granule;

[0035] figure 2 It is the CuW alloy structure added with lubric...

Embodiment 3

[0038] Mix submicron tungsten powder, copper powder and WS2 according to the mass ratio of 1000:70:9 and put them into the mixer, and add tungsten carbide grinding balls according to 1:1 of the total powder mass Mix the powder at a speed of 120r / min for 4 hours. The mechanically mixed powder is bonded, dried, and sieved. The powder is pressed through a cold pressing die with a pressing pressure of 500KN and held for 40 seconds to form a blank. The blank formed by pre-pressing , place the copper block on the blank and then sinter at 960°C for 2h and infiltrate at 1300°C for 2h under a hydrogen protective atmosphere. The hardness of the obtained CuW alloy is 190HB, the electrical conductivity is 23.5MS / m, and the withstand voltage strength is 3.0×10 7 V / M.

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Abstract

The invention discloses a method for improving the hardness of CuW alloy. After WS2, tungsten powder and Cu powder are mixed, bonding, airing and powder screening are carried out, and mixed powder is obtained; the mixed powder is pressed to form a blank through a cold pressing mold; a copper block is placed on the blank, the copper block and the blank are put in a high-purity graphite crucible together, sintering and infiltration are carried out in a hydrogen shielding atmosphere, and the CuW ally is obtained. According to the preparation method for improving the hardness of the CuW alloy, due to the fact that WS2 is added, a good W framework is formed in the alloy, the hardness of the CuW alloy is improved, and the highest hardness of the CuW alloy can reach 215 HB and is 23% higher than the national standard.

Description

technical field [0001] The invention belongs to the field of CuW alloy prepared by powder metallurgy, and in particular relates to a method for improving the hardness of CuW alloy. Background technique [0002] CuW alloy is a composite material with excellent properties composed of Cu with good electrical and thermal conductivity and W with high strength, high melting point, high density and low expansion coefficient. Because W of the body-centered cubic structure and Cu of the face-centered cubic structure neither solid solution with each other nor form intermetallic compounds, such composite materials are usually called pseudoalloys. CuW pseudo-alloy has the advantages of both Cu and W, and has been widely used in many fields such as electric power, electronics, machinery, metallurgy, aerospace and military industry. Among many composite materials, CuW-based contact materials are widely used as contact materials because of their good arc erosion resistance, welding resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10C22C27/04
CPCC22C1/045C22C1/05C22C27/04
Inventor 邹军涛赵聪梁淑华肖鹏杨晓红姜伊辉卓龙超
Owner 嘉兴如运建筑科技有限公司
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