Method of forming a silicon nitride article

Details Method of forming a silicon nitride article Method of forming a silicon nitride article

1975-01-28

1976-12-14

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

264 63, 264 65, 264 86, 264317, 264DIG44, B28B 126, B29C 108

Patent

active

039976408

ABSTRACT:
A method of forming an article of silicon nitride is disclosed. A complex shape of an article is formed in a molding material which may be liquified by heating. A porous shell is formed about the shaped molding material with a refractory ceramic material which loses its structural strength when heated to a high temperature. The molding material is removed from the porous shell and a silicon metal slip is cast into the vacated volume. The silicon metal of the slip is nitrided at a temperature which is also effective to destroy any structural strength of the refractory ceramic material forming the porous shell. The weakened porous shell is removed from the nitrided article to produce the final article.

REFERENCES:
patent: 3123886 (1964-03-01), Miller
patent: 3445250 (1969-05-01), Preece
patent: 3494997 (1970-02-01), Dittrich
patent: 3885005 (1975-05-01), Downing
patent: 3887411 (1975-06-01), Goodyear
Cottrell, An Introduction to Metallurgy, pp. 184-185 (1967).

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