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AssigneeNippon Piston Ring Co., Ltd.
InventorsTeruo Takahashi, Arata Kakiuchi, Kenichi Sato
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A valve seat made of an iron base sintered alloy for internal combustion engines comprises of hard particles of hardness 700-1300 Hv dispersed by 3-20% by volume in a matrix phase comprising comprising of a 5-40% psarlite phase, a 20-60% fine carbide dispersed phase, and a 5-20% high alloy diffusd phase. The hard paricles are preferably selected from a group of Mo--Ni--Cr--Si--Co intermetallic compound particles, Cr--Mo--Co intermetallic compound particles, and Fe--Mo alloy particles. The iron base sinteed alloy is conpised of, by weight, C: 0.2-2.0%, Cr: 1.0-9.0%, Mo: 1.0-9.0%, Si: 0.1-1.0%, W: 1.0-50%, V: 0.2-3.0%, one or more Cu, Co and Ni of 0.5-10.0% in total, and the remainder substantial Fe.
An iron base sintered alloy material for a valve seat, in the matrix phase of which hard particles were dispersed, wherein said matrix phase comprises, by volume, a 5-40% pearlite phase, a 20-60% fine carbide dispersed phase, and a 5-20% high alloy diffused phase, said hard particles with hardness of 700-1300 Hv being dispersed by 3-20% by volume therein.
An iron base sintered alloy material for a valve seat, in the matrix phase of which hard particles were dispersed, wherein the composition of the matrix portion including said hard particles is composed of, by weight, C:
Dependencies are inferred from the claim text.