Patent ID: 6488736
Filing Date: 2002-12-03
Classification: C22C,F16H

Abstract:
A method of producing a sintered metal sprocket for a silent chain, comprising:preparing a base mixture which contains a metallurgical iron powder, a lubricant and a graphite powder, said metallurgical iron powder containing in weight ratio 2.0% to 5.0% of Ni (nickel), 0.2% to 1.0% of Mo (molybdenum), 0.5% to 2.0% of Cu (copper), 1% of C (carbon) and residue of Fe (iron) and impurities, the metal grains of Ni, Mo and Cu being diffusion-bonded onto each grain of Fe; subjecting said base mixture to a compression molding while heating the same above approximately 100Â° C. thereby to produce a green compact of sprocket; and sintering the green compact of sprocket at a temperature above approximately 1180Â° C. to produce a sintered metal sprocket.