| 摘要 |
PROBLEM TO BE SOLVED: To provide a sintered valve seat excellent in wear resistance and reduced in attacks on mating materials. SOLUTION: This valve seat has a composition consisting of, by weight, 15-40% Cu, 0.5-15% Ni, 0.0005-0.85% C, and the balance Fe with inevitable impurities and also has a structure constituted by binding an Fe-base alloy phase composed essentially of Fe with a Cu-base alloy phase composed essentially of Cu. The Fe-base alloy phase is an Fe alloy phase containing Ni, Cu, C, and >=50 wt.% Fe, and the Cu-base alloy phase is a Cu alloy phase containing Ni, Fe, C, and >=50 wt.% Cu, and further, the concentration of Ni and C contained in the Fe-base alloy phase is higher than the concentration of Ni and C contained in the Cu-base alloy phase.
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