| 摘要 |
PROBLEM TO BE SOLVED: To produce a high strength iron base sintered alloy by cooling the sintered body of a high carbon alloy contg. either or both of Ni and Cu together with Mo to a room temp., thereafter holding it under heating to a temp. directly above the austentic one and executing quenching and tempering. SOLUTION: The powder of either of both of Fe-Mo powder and Cu powder and graphite powder and mixed together with zinc stearate, and this powdery mixture is subjected to compacting form into a powdery green compact having a compsn. contg. one or two kinds of 1 to 4% Ni and 1 to 4% Cu, 0.5 to 4% Mo, 0.5 to 0.9% C, and the balance Fe. This is, moreover, subjected to compacting, is sintered, e.g. at 1120 deg.C in a nonoxidizing atmosphere, is thereafter held at the sintering temp. for 30min and is subjected to furnace cooling to a room temp. to produce the iron base sintered alloy in which high hardness metallic carbides having 0.1 to 5μm average particle size are uniformly dispersed into a martensitic matrix and extremely excellent in strength.
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