AN EXPLOREMENT ON CuCrMoFe CONTACT MATERIALS

The microstructure. alloying elements distribution and fracture of CuCrMoFe contacter for vacuum switch have been investigated. The results show that the microstructure of CuCrMoFe contacter consists of two phases, one is Cu solid solution, the other is Cr solid solution. In the structure, alloying element Mo dissolved in Cr base phase only. Alloying element Fe solutes in Cr base phase mainly and a small amount of solutes in Cu base phase. The fracture of CuCrMoFe alloy shows cross-grain fracture behaviour and the grain size is smaller than that of CuCr50 alloy. The physical properties are better than that of CuCrFe alloy.