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Method for preparing cucr 40 contact material by vacuum casting method

A technology for electrical contacts and vacuum furnaces, which is applied in the field of CuCr 40 electrical contacts prepared by vacuum melting and casting, which can solve the problems of difficult process stability, poor toughness, and large particle size of CuCr40

Active Publication Date: 2011-12-28
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these four manufacturing processes, the interface between Cr particles and matrix Cu in the mixed powder sintered CuCr40 material is poor, and the toughness is poor.
The CuCr40 prepared by the infiltration method has a large particle size, the withstand voltage strength is not ideal, and the breaking capacity has reached the limit
The vacuum arc self-consumption method can produce an ideal CuCr40 contact material, but its cost is high and the process stability is difficult to master
The vacuum casting process has many advantages and advantages, but before that, the vacuum casting method can only produce CuCr25 and CuCr30 contact materials

Method used

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  • Method for preparing cucr 40 contact material by vacuum casting method
  • Method for preparing cucr 40 contact material by vacuum casting method
  • Method for preparing cucr 40 contact material by vacuum casting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 2.24kg of Cr block, under the protection of low-temperature liquid, process it into Cr powder by grinding and crushing machine, control the powder-making temperature below -100°C, press Cr powder, and sinter at 1300°C for 1 hour to make Cr powder blank , and then weigh 3.36Kg of Cu block and Cr powder into a vacuum furnace, at P≤8×10 -2 Heating at a speed of 80°C / min under a vacuum of Pa, when the temperature rises to 1800°C for 5 minutes, rapid casting. After cooling, the CuCr40 electrical contact material is obtained.

Embodiment 2

[0024] Weigh 2.24 kg of Cr block under the protection of low-temperature liquid, and process it into Cr powder by grinding and crushing machine. The powder-making temperature is controlled at -100°C. After the Cr powder is pressed, it is sintered at 1350°C for 2 hours to make Cr powder. Then weigh 3.36kg of Cu block and put it into a vacuum furnace with Cr powder, at P≤8×10 -2 Heating at a speed of 80°C / min under a vacuum of Pa, when the temperature rises to 1900°C and keeps for 5 minutes, rapid casting. After cooling, the CuCr40 electrical contact material is obtained.

Embodiment 3

[0026] Weigh 2.24kg of Cr block under the protection of low-temperature liquid, and process it into Cr powder by grinding and crushing machine. The powder-making temperature is controlled at -100°C. After the Cr powder is pressed, it is sintered at 1400°C for 3 hours to make Cr powder. Then weigh 3.36kg of Cu block and put it into a vacuum furnace with Cr powder, at P≤8×10 -2 Heating at a speed of 80°C / min under a vacuum of Pa, when the temperature rises to 2000°C and keeps for 5 minutes, rapid casting. After cooling, the CuCr40 electrical contact material is obtained.

[0027] The composite material prepared by the invention has excellent comprehensive properties. The performance comparison between the prepared CuCr40 composite material and the infiltration method CuCr40 composite material is shown in Table 1.

[0028] Table 1 Performance comparison of CuCr40 composites

[0029]

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Abstract

The invention discloses a CuCr40 electric contact prepared by adopting a vacuum melting casting method, which belongs to the technical field of metal material preparation. Its composition by weight percentage is: 40% Cr, and the rest is Cu. It is prepared by the following method: under the protection of low-temperature liquid, the Cr block is processed into Cr powder by grinding and crushing machine, the Cr powder is pressed and sintered into Cr powder, and then the Cu block and Cr powder are put into a vacuum furnace Heating, casting after melting, and then producing CuCr40 electrical contact material after cooling. The invention has the advantages of crushing Cr lumps into Cr powder, and then pressing and sintering to make Cr powder billets, which lowers the melting temperature and shortens the melting time. The preparation method of the invention has simple process and low cost, and the prepared CuCr40 composite material has superior performance compared with the infiltrated CuCr40 composite material.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, and in particular relates to a method for preparing CuCr 40 electric contacts by vacuum melting and casting. Background technique [0002] CuCr40 is mainly used in 12kv and 40.5kv vacuum interrupters. There are four manufacturing processes for CuCr alloy contact materials at home and abroad: (1) mixed powder pressing and sintering method; (2) vacuum infiltration method; (3) vacuum casting method; (4) vacuum arc self-consumption method. In these four manufacturing processes, the interface bonding between Cr particles and matrix Cu in CuCr40 material mixed with powder and sintered is poor, and the toughness is poor. The CuCr40 prepared by the infiltration method has a large particle size, the withstand voltage strength is not ideal, and the breaking capacity has reached the limit. The vacuum arc self-consumption method can produce a relatively ideal CuCr40 contact material, but...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D25/06B22D18/06
Inventor 王文斌王小军师晓云张红军李刚
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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