Method for producing CuCr40 contact material with vacuum fusion cast method

Abstract

The invention discloses a method for preparing a CuCr40 electrical contact by adopting a vacuum fusion casting method, which belongs to the technical field of metal materials preparation. The CuCr40 electrical contact comprises the following compositions in percentage by weight: 40 percent of Cr, and the balance being Cu. The CuCr40 electrical contact is prepared by the following method: a Cr block is processed into Cr powder through a grinding crusher under the protection of low-temperature liquid; the Cr powder is pressed and then is sintered into a Cr powder billet; and then a Cu block and the Cr powder billet are placed into a vacuum furnace for heating, the casting is performed after the fusion, and a CuCr40 electrical contact material is obtained after cooling. The method has the advantages that the Cr block is crushed into the Cr powder, and the Cr powder is then pressed and sintered into the Cr powder billet, so as to reduce fusion temperature and shorten fusion time. The preparation method has simple process and low cost, and the prepared CuCr40 composite material has more excellent performance compared with a filtrated CuCr40 composite material prepared by infiltration.

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...

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

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