Riken Corporation

Riken Piston Ring Industrial Co. Ltd.

Kazutoshi Takemura

Fumio Kiyota

Takashi Oda

An iron-base sintered alloy especially suitable for valve seat manufacture having excellent wear resistance and being able to be machine-cut is provided. The alloy is produced by combining specifically atomized pre-alloyed powder, iron powder, nickel powder and graphite powder by means of compacting and sintering processes, and has a microstructure comprising pearlite and globular hard alloy phase formed with said atomized pre-alloyed hard alloy powder uniformly dispersed in said pearlite and martensite surrounding said hard alloy phase.

Iron-base sintered alloy for valve seat and method of making the same

A novel group of iron-base sintered alloys especially suitable for valve seat manufacture having excellent wear resistance and good machinability is provided. The alloy is produced by a combination of specific atomized pre-alloyed powder, iron powder and graphite powder by compacting and sintering processes. Various manufacturing methods with or without infiltration of filler materials into pores in the sintered product to improve wear resistance and machinability are disclosed.

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Kashiwazaki, Japan

Kazutoshi Takemura