Sintered products having good machineability and wear characteristics

Abstract

An iron-based sintered powder metal mixture for valve guides, valve seat inserts and other high temperature, high wear applications requiring excellent net-shape stability during sintering comprises a powder metal mixture consisting essentially of 0.5-2.0 wt. % of fine, soluble graphite which goes into solution in the elemental iron matrix, 0.5-2.5 wt. % stable graphite which remains as free graphite in the sintered structure, 0.5-3.0 MoS2, which reacts with 1.0-5.0 wt. % copper to drive a sintering reaction at relatively low sintering temperatures of between 1030—1150° C. The resulting sintered particles have good mechanical strength and wear resistance and possess excellent machineability and dimensional stability.

Dependencies are inferred from the claim text.