C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
25/133
C04B 35/58 (2006.01) C04B 35/593 (2006.01)
Patent
CA 1193836
METHOD OF PRODUCING DENSE SILICON NITRIDE CERAMIC ARTICLES HAVING CONTROLLED SURFACE LAYER COMPOSITION Abstract of the Disclosure 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.
416965
Lingertat Helmut
Moschetti Anthony P.
Nehring Vincent W.
Quackenbush Carr L.w.
Smith J. Thomas
Gte Laboratories Incorporated
R. William Wray & Associates
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