PROCESS FOR PRODUCING A CU-CR MATERIAL BY POWDER METALLURGY

摘要

The invention provides a process for producing a Cu-Cr material for a switching contact, in particular for vacuum switches, by powder metallurgy, said process comprising the following steps: (S2) a Cu-Cr powder mixture formed from Cu powder and Cr powder is pressed, (S3) the pressed Cu-Cr powder mixture is sintered to form the material of the Cu-Cr switching contact. The sintering or a subsequent heat treatment process is carried out with an alternating temperature profile in which the Cu-Cr powder mixture, or the Cu-Cr material, is heated at least twice alternately above an upper temperature limit value (S4) and is cooled again below a lower temperature limit value (S5). All of the steps are carried out at temperatures at which no molten phase forms.