Method of densifying an article formed of reaction bonded silico

Details Method of densifying an article formed of reaction bonded silico Method of densifying an article formed of reaction bonded silico

1980-08-29

1982-10-26

Derrington, James H.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 85, 501 97, 501103, 501122, 501152, C04B 3558

Patent

active

043561365

ABSTRACT:
A method of densifying an article formed of reaction bonded silicon nitride is disclosed. The reaction bonded silicon nitride article is packed in a packing mixture consisting of silicon nitride powder and a densification aid. The reaction bonded silicon nitride article and packing powder are sujected to a positive, low pressure nitrogen gas treatment while being heated to a treatment temperature and for a treatment time to cause any open porosity originally found in the reaction bonded silicon nitride article to be substantially closed. Thereafter, the reaction bonded silicon nitride article and packing powder are subjected to a positive high pressure nitrogen gas treatment while being heated to a treatment temperature and for a treatment time to cause a sintering of the reaction bonded silicon nitride article whereby the strength of the reaction bonded silicon nitride article is increased.

REFERENCES:
patent: 4179486 (1979-12-01), Lange
patent: 4209478 (1980-06-01), Wooten et al.
patent: 4280973 (1981-07-01), Moskowitz
patent: 4285895 (1981-08-01), Mangels et al.
patent: 4296065 (1981-10-01), Ishii et al.

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