PROCESS FOR PRODUCING SINTERED BRONZE ALLOY POWDER

摘要

A process for producing a sintered bronze alloy powder, characterized by comprising: a provisional sintering step in which a copper/tin mixed powder prepared by mixing a 200-mesh powder of electrolytic copper with a 350-mesh tin powder so as to result in a tin powder proportion of 8-11 wt.% is sintered at 300-600ºC in a reducing atmosphere and then pulverized; a final sintering step in which the provisionally sintered powder is sintered again at 500-700ºC in a reducing atmosphere; and thereafter pulverizing and sieving the sintered powder. Provided is a bronze alloy powder which has a microfine particle size and is suitable for producing oil-impregnated sintered bearings having a reduced size. Although a microfine raw-material powder, the bronze alloy powder has flowability that causes no decrease in productivity.