SINTERING METHOD OF FERROUS SINTERED ALLOY

摘要

PROBLEM TO BE SOLVED: To reduce sintering time while completely sintering and sufficiently assuring product strength. SOLUTION: In a sintering method of a ferrous sintered alloy in which green compact made of ferrous powder is subjected to induction heating to sinter, a first activation treatment in which the green compact is held in a temperature range between 473 to 673 K and a second activation treatment in which the green compact is held in a temperature range between 973 to 1273 K are executed in a period from stating of heating till the green compact reaches a maximum temperature. Holding time in the above temperature range is 30 to 120 seconds and an average heating rate except holding time in the above temperature range is made to be <=40 K /second.