C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
25/133
C04B 35/58 (2006.01) B32B 9/04 (2006.01) C04B 35/584 (2006.01)
Patent
CA 1206730
SINTERED SILICON NITRIDE CERAMIC ARTICLES HAVING SURFACE LAYERS OF CONTROLLED COMPOSITION ABSTRACT OF THE DISCLOSURE Sintered silicon nitride-silica-yttria ceramic articles having silica-rich or yttria-rich casing layers are disclosed. The surface layers are formed by sintering pre-compacted bodies in a powder setter bed to produce unitary sintered bodies having surface layers in which the atom ratio of yttrium to silicon has a smooth gradient from the surface of the article to the interior body of the article.
417000
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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