Heat resistant and wear resistant iron-base sintered alloy

Details Heat resistant and wear resistant iron-base sintered alloy Heat resistant and wear resistant iron-base sintered alloy

1988-06-30

1989-07-04

Cross, E. Rollins

Internal-combustion engines

Valve

Reciprocating valve

251358, 75238, F01L 300

Patent

active

048440248

ABSTRACT:
A heat resistant and wear resistant iron-base sintered alloy to be used as the material of a valve seat and a valve face of an engine valve and a waste gate valve of a turbocharger for an internal combustion engine. The iron-base sintered alloy consists essentially of at least one of molybdenum and tungsten, ranging from 3 to 25% by weight, chromium ranging from 1 to 10% by weight, silicon ranging from 0.1 to 0.9% by weight, manganese ranging not more than 0.7% by weight, phosphorus ranging not more than 0.05% by weight, carbon ranging from 0.1 to 2.5% by weight, boron ranging from 0.5 to 2.0% by weight, intermetallic compound of TiAl ranging from 0.3 to 20% by weight, and balance including iron and impurities. In the sintered alloy, carbide, boride and/or carbide boride and TiAl are uniformly dispersed in the matrix, thereby strengthening grain boundary.

REFERENCES:
patent: 4648903 (1987-03-01), Ikenoue et al.
patent: 4734968 (1988-04-01), Kuroishi et al.
patent: 4778522 (1988-10-01), Maki et al.

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