Effect of Sintering Processing on Microstructure and Hardness of Bearing Material CuPb10Sn10

The effect of repressing and resintering on density,hardness and microstructure of copper-base alloys CuPb10Sn10 prepared by repressing and resintering at 800℃ for 5,15 and 25 minutes respectively was investigated.The results show that the density can be improved and pores can be decreased after repressing and resintering.The relative density of all samples reached above 95%.Increase of the holding time led to phases aggregated remarkably.After the first repressing,hardness was improved greatly because of work-hardening.After the second sintering,hardness became low because the lead phases accumulated and work-hardening was eliminated.The hardness increased again when repressing was performed again.