Patent ID: 7309465

Claim:
A production method for a sintered sprocket for a silent chain, comprising: preparing a mixed powder consisting of a Cu powder at 1 to 2% by mass, a graphite powder at 0.6 to 1.0% by mass, a lubricant powder at 1% or less by mass, and an atomized iron powder as balance, the atomized iron powder containing Mn at 0.10% or less by mass and O (oxygen) at 0.10% or less by mass in inevitable impurities, in the entire composition, compacting the mixed powder to form into a sprocket shape having a density of 7.1 Mg/m 3 or higher at least in a gear teeth and a peripheral parts of the gear teeth, thereby obtaining a green compact, sintering the green compact in a non-oxidizing gas atmosphere, thereby obtaining a sintered body, and quenching and tempering at least the gear teeth of the sintered body.