Importance

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Abstract

A powder admixture useful for making a sintered engine part such as a valve seat insert includes a first iron-base powder and second iron-base powder wherein the first iron-base powder has a higher hardness than the second iron-base powder, the first iron-base powder including, in weight percent, 1-2% C, 10-25% Cr, 5-20% Mo, 15-25% Co, and 30-60% Fe, and the second iron-base powder including a vanadium-free tool steel powder such as a vanadium-free tool steel comprising, in weight %, 1-1.5% C, 3-15% Cr, 5-7% Mo, 3-6% W, and 60-85% Fe, the second iron-base powder further comprising vanadium carbide particles in an amount sufficient to reduce adhesive wear. The powder admixture can be sintered to form a sintered engine part optionally infiltrated with copper.

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First Claim