Abrasion resistant iron base sintered alloy material for valve s

Details Abrasion resistant iron base sintered alloy material for valve s Abrasion resistant iron base sintered alloy material for valve s

1999-08-23

2000-10-31

Mai, Ngoclan

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75243, 1231883, B22F 500

Patent

active

061395994

ABSTRACT:
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.

REFERENCES:
patent: 4233073 (1980-11-01), Takemura
patent: 5498483 (1996-03-01), Ito et al.
patent: 5759227 (1998-06-01), Takahashi et al.
patent: 5870989 (1999-02-01), Takahashi et al.

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