Patent ID: 7553445

Claim:
A manufacturing process of a sintered iron-copper base porous alloy for oil-impregnated sintered bearings, comprising: preparing a mixed powder comprising an iron powder, and at least one of a copper powder and a copper alloy powder, the mixed power at a copper content of 10 to 35% by mass, the iron powder comprising a porous iron powder, the porous iron powder having a particle size of 44 to 177 microns and having thin pores such that an apparent density is 1.3 to 2.5 Mg/m 3 and a specific surface area is 175 to 500 m 2 /kg according to a gas adsorption method; forming the mixed powder into a green compact; and sintering the green compact to obtain a sintered iron-copper base porous alloy in which pores of the porous iron powder produce intercommunicating pores.