Engine valve having improved high-temperature wear resistance

Details Engine valve having improved high-temperature wear resistance Engine valve having improved high-temperature wear resistance

1994-12-12

1996-03-05

Yuen, Henry C.

Internal-combustion engines

Valve

Reciprocating valve

251368, F01L 302

Patent

active

054958377

ABSTRACT:
A coated valve face of an engine valve is formed of an Fe-based alloy having a composition consisting essentially of, by weight, 0.7 to 1.5% of C, 10 to 15% of Mn, 24 to 30% of Cr, 6.1 to 9.8% of Mo, 10 to 15% of Ni, 0.1 to 0.4% of N, 0.2 to 1.5% of Si, and optionally at least one of 0.1 to 5% of Nb, 0.1 to 5% of Ta and 0.15% of W as required (the total content of Nb, Ta and W being limited to 5% or less), and the balance substantially Fe and inevitable impurities, and having a two-phase structure formed of an austenitic phase and an eutectic carbide phase. In another embodiment, the composition contains between 0.05 to 1% Co. The Fe-based alloys are preferably applied to the valve face by plasma beam or laser beam coating of powdered such alloys onto the valve face.

REFERENCES:
patent: 5422321 (1995-06-01), Whalen et al.

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