A POWDERED METAL PART, A METALLIC POWDER MIXTURE AND A PROCESS FOR MAKING A POWDERED METAL PART

摘要

A powdered metal blend mixture for making a powdered metal part especially a valve seat insert. The mixture includes 15 to 30 wt.% of a valve steel powder, 0 to 10 wt.% nickel, 0 to 5 wt.% copper, 5 to 15 wt.% of a ferro-alloy powder, 0 to 15 wt.% of a tool steel powder, 0.5 to 5 wt.% of a solid lubricant, 0.5 to 2 wt.% graphite, 0.3 to 1.0% of a temporary lubricant, and the balance being substantially a low alloy steel powder containing 0.6 to 2.0 wt.% molybdenum, 0 to 5 wt.% nickel, and 0 to 3.0 wt.% copper. The present invention provides improved high temperature wear and corrosion resistance over prior art materials as well as improved machinability. The blend of the present invention provides a relatively high density material that allows for a single press and sinter technique. IMAGE