Method of strengthening silicon nitride ceramics

Details Method of strengthening silicon nitride ceramics Method of strengthening silicon nitride ceramics

1981-05-22

1984-07-03

Childs, Sadie L.

Coating processes

With pretreatment of the base

Heating or drying pretreatment

264 62, 427193, 427355, 427399, B05D 302

Patent

active

044579586

ABSTRACT:
Si.sub.3 N.sub.4 ceramics having a glassy phase densification aid are heated while their surface is in contact with SiO.sub.2. The SiO.sub.2 forms one side of a diffusion couple and draws the glassy phase out of the ceramic. The SiO.sub.2 can be provided by heating the ceramic in air to form an SiO.sub.2 scale by the oxidation of Si.sub.3 N.sub.4, or by imbedding the ceramic in SiO.sub.2 powder. Surface pits, if any, formed during oxidation, are removed by grinding.

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patent: 4179486 (1979-12-01), Lange

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