Microstructure and Properties of CuW50Cr25 Composite

CuW50Cr25 composite prepared by infiltration was investigated. The results show that the microstructure consists of four phases: W-rich and Cr-rich CuWCr solid solution as well as Cr-rich and Cu-rich CrCu phases. The original Cr particles in the compact are replaced part by Cu-rich CuCr phase and part by Cr-rich CrCu phase which is the first breakdown phase in the course of the material’s arcing. The chopping current value of CuW50Cr25 composite is 2.4A and arc duration is 4.01ms. These properties are much more excellent than counterpart of CuW70. The breakdown strength is 2.31×108 V/m and comparable with the CrCu contact materials.