FABRICATION METHOD OF ALLOY PARTS BY METAL INJECTION MOLDING AND THE ALLOY PARTS

摘要

A manufacturing method by metal injection molding and alloy parts manufactured by the same is provided to cut down manufacturing cost of high value-added precision parts having low sintering temperature and superior hardness and commercial production property. An alloy part manufacturing method comprising the following steps of: mixing a binder with an alloy powder having a composition comprising 40 to 75 wt.% of at least one component selected from the group consisting of Fe and a combination of Fe and Co, 20 wt.% or more of at least one component selected from the group consisting of W, Mo, Cr, Nb, V and Ni, 2 to 14 wt.% of at least one component selected from the group consisting of B, C, Cu, and Si, and the other inevitable impurities; injection molding the mixture to mold the mixture in the form of a part; separating the binder from the injection molded article; and sintering the binder-removed injection molded article, the alloy part is characterized in that the alloy powder has a composition comprising 20 to 35 wt.% of Cr, 1 to 2.5 wt.% of Si, 0.5 wt.% or less of C, 0.1 to 3 wt.% of Cu, 2 to 5 wt.% of B, 0.1 to 8 wt.% of Mo, 14 to 22 wt.% of Ni, and 4 to 15 wt.% of Co.