PROCESS FOR PRODUCING A CU-CR MATERIAL BY POWDER METALLURGY

摘要

A process for producing a Cu—Cr material by powder metallurgy for a switching contact, in particular for vacuum switches, includes the steps of pressing a Cu—Cr powder mixture formed from Cu powder and Cr powder and sintering the pressed Cu—Cr powder mixture to form the material of the Cu—Cr switching contact. The sintering or a subsequent thermal treatment process is carried out with an alternating temperature profile, in which the Cu—Cr powder mixture or the Cu—Cr material is heated above an upper temperature limit value and cooled again below a lower temperature limit value at least twice in alternation. All of the steps are carried out at temperatures at which no molten phase forms.

主权项

1. A process for producing a Cu—Cr material by powder metallurgy for a switching contact or a vacuum switch contact, the process comprising the following steps:
pressing a Cu—Cr powder mixture formed from Cu powder and Cr powder; sintering the pressed Cu—Cr powder mixture to form the material of the Cu—Cr switching contact; and carrying out at least one of a sintering or subsequent thermal treatment process with an alternating temperature profile by heating the Cu—Cr powder mixture or the Cu—Cr material above an upper temperature limit value and cooling the Cu—Cr powder mixture or the Cu—Cr material again below a lower temperature limit value at least twice in alternation, and carrying out all of the steps at temperatures at which no molten phase forms.