Abrasion resistant valve seat made of sintered alloy for interna

Details Abrasion resistant valve seat made of sintered alloy for interna Abrasion resistant valve seat made of sintered alloy for interna

1997-12-05

1999-02-16

Solis, Erick R.

Internal-combustion engines

Valve

Reciprocating valve

1231888, 75236, 75246, F01L 302

Patent

active

058709894

ABSTRACT:
The invention is directed to an iron series sintered alloy superior in abrasion resistance, preferably usable for slipping parts such as valve seats used in internal combustion engines, vanes in compressors and so forth. The sintered alloy is of base matrix of a mixed structure comprising the primary phase of in area ratio 30.about.95% mainly of Fe having a hardness of 400 Hv or above with precipitated fine carbide of 10 .mu.m or smaller, and the secondary phase of in area ratio 5.about.70% softer than said primary phase, consisted of pure iron or carbon steel or low alloy steel. This base matrix will include in area ratio 1.about.20% infiltrated or previously added Cu phase or Cu alloy phase, or will include dispersed therein in area ratio 1.about.20% hard particles having average diameter of 20.about.100 .mu.m and a hardnessof 700.about.1500 Hv such as Fe--Mo paricles, Cr--Mo--Co intermetallic compound particles, C--Cr--W--Co particles, etc.

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