Process for fabricating fluid-control members for internal-combu

Details Process for fabricating fluid-control members for internal-combu Process for fabricating fluid-control members for internal-combu

1978-08-03

1979-07-17

Stallard, W.

Metal treatment

Compositions

Heat treating

148 115N, 148 115Q, 148 39, 148127, C22F 110

Patent

active

041614143

ABSTRACT:
A stem valve for an internal-combustion engine, especially one burning heavy oil, has a body composed of a first nonferrous alloy with an annular seat-engaging zone into which a second nonferrous alloy has been diffused to form a third alloy in situ. The first alloy contains about 30% chromium and about 60% nickel with practically no cobalt, whereas the second alloy contains about 50% cobalt, 30% chromium and lesser amounts of other metals but no nickel. The resulting third alloy, whose composition is made more or less uniform throughout the interdiffusion zone by thermal and mechanical processing, contains substantially equal proportions of nickel and chromium on the order of 30% each.

REFERENCES:
patent: 2246078 (1941-06-01), Rohn et al.
patent: 2734008 (1956-02-01), Kirkpatrick et al.
patent: 3461001 (1969-08-01), Kubera

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