Valves and valve actuation – Valve – Materials
Patent
1985-06-12
1987-06-09
Chambers, A. Michael
Valves and valve actuation
Valve
Materials
291567A, 291571R, 123188S, 428679, B21K 120, F01L 300
Patent
active
046714910
ABSTRACT:
A valve-seat insert for internal combustion engines comprises a double-layered, sintered alloy composed of a valve-seat layer on which a valve is seated, and a base layer integrated with the valve-seat layer and adapted to be seated in a cylinder head of an engine. The valve-seat layer is composed of a sintered alloy of a high heat resistance and a high wear resistance having a composition comprising, by weight, 4 to 8% Co, 0.6 to 1.6% Cr, 4 to 8% Mo, 1 to 3% Ni, 0.3 to 1.5% C, 0.2 to 0.6% Ca, and the balance of Fe and inevitable impurities, the additives, Co, Cr and Mo being present mainly in a form of a Co-Cr-Mo hard alloy and a hard Fe-Mo alloy dispersed in the Fe matrix. The base layer is composed of a sintered alloy of a higher heat resistance and a higher creep resistance than those of the valve-seat layer and having a composition comprising, by weight, 11 to 15% Cr, 0.4 to 2.0% Mo, 0.05 to 0.3% C, and the balance of Fe and inevitable impurities. At least the valve-seat layer of the double-layered, sintered alloy is being fusion-infiltrated with copper.
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Kuroishi Nobuhito
Manabe Akira
Motooka Naoki
Suganuma Tetsuya
Chambers A. Michael
Sumitomo Electric Industries Ltd.
Toyota Motor Corporation
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