Method of producing dense silicon nitride ceramic articles havin

Details Method of producing dense silicon nitride ceramic articles havin Method of producing dense silicon nitride ceramic articles havin

1981-12-21

1983-05-17

McCarthy, Helen M.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264325, 264332, 428332, 501 98, 501152, C04B 3558

Patent

active

043839584

ABSTRACT:
Dense, composite, polycrystalline ceramic articles comprising silicon nitride, silicon dioxide, and yttrium oxide and having thin surface layers of controlled composition are formed by sintering pre-pressed compacts embedded in setter bed powder mixtures having compositions of silicon nitride, silicon dioxide, and yttrium oxide which differ from that of the pressed compact.
Employing the method of this invention, articles are produced which have surface layers in which the minor phase of the article is enriched with either yttrium or silicon.

REFERENCES:
patent: 4234343 (1980-11-01), Anderson
patent: 4285895 (1981-08-01), Mangels et al.
patent: 4310499 (1982-01-01), Mitomo et al.
patent: 4323325 (1982-04-01), Samanta et al.
patent: 4356136 (1982-10-01), Mangels

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