Hitachi Powdered Metals Co., Ltd.

Toru Tsuboi

Hideaki Kawata

Koichiro Hayashi

Yoshimasa Aoki

Kunio Maki

Hiroki Fujitsuka

Koichi Aonuma

Tatsuaki Yoshihiro

A manufacturing method for wear resistant sintered member is provided. The method includes: compacting a raw powder containing a matrix forming powder and a hard phase forming powder into a green compact, the matrix forming powder containing 90 mass % or more of a powder having the maximum particle diameter of 46 &#x3bc;m, and the hard phase forming powder being 40 to 70 mass % with respect to the raw powder; and sintering the green compact.

Manufacturing method for wear resistant sintered member, sintered valve seat, and manufacturing method therefor

A valve seat is provided in which wear resistance can be ensured by optimizing the matrix structure without dispersing of expensive hard particles, and therefore the machinability can be improved and the holding down of cost can be achieved. The valve seat exhibits a metallographic structure consisting of only bainite single phase or only a mixed phase of bainite and martensite, has an area ratio of bainite and martensite in cross section of 100:0 to 50:50, and has a matrix hardness of 250 to 850 Hv.

Valve seat for internal combustion engines

A sintered alloy having superb wear resistance comprising: composite phases dispersed in a matrix of the sintered alloy; the composite phase consisting of; a particle group in which Cr carbide particles and Cr sulfide particles exist in a mixed condition; and a ferrite phase or a mixture phase of ferrite and austenite surrounding the particle group as a core.

Sintered alloy having superb wear resistance and process for producing the same

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Matsudo, Japan

Toru Tsuboi