Patent ID: 8277533

Claim:
A powder metallurgy mixture having a composition, in weight percentage (wt %) of the powder metallurgy mixture, excepting incidental impurities, of between 55-90 wt % iron-based matrix powder, between 45-10 wt % hard phase powder, optionally a machinability aid, optionally a solid lubricant selected from the group of: CaF 2 , MoS 2 , talc, free graphite flakes, BN and BaF 2 , wherein the machinability aid and the solid lubricant are provided in amounts not greater than 5 wt % each, the above constituents together total 100 wt % of the powder metallurgy mixture, and the hard phase powder has a composition, in weight percentage (wt %) of the hard phase powder, excepting incidental impurities, of at least 30 wt % Fe: 1-3 wt % C 20-35 wt % Cr 2-22 wt % Co 2-15 wt % Ni 8-25 wt % W optionally one or more of the following elements in greater than trace amounts, but not totaling any more than 5 wt % of all such elements: V, Ti, Cu, and the balance being Fe.