Compositions: ceramic – Ceramic compositions – Pore-forming
Patent
1991-05-14
1992-06-02
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Pore-forming
501 80, 501 95, C04B 3800
Patent
active
051186446
ABSTRACT:
There is provided a thermal shock-resistant silicon nitride sintered material consisting substantially of silicon nitride and rare earth element compounds, which material contains at least 10 pore groups per mm.sup.2, each pore group consisting of pores of 10 .mu.m or less and which material has a thermal shock resistance .DELTA.Tc (.degree.C.) of 1,000 .degree. C. or more. The thermal shock-resistant silicon nitride sintered material can be produced by mixing and shaping starting materials consisting of a silicon nitride powders of rare earth element oxides and carbide power, and then firing the shaped material in a nitrogen atmosphere to decompose the carbide powders.
Takahashi Akira
Watanabe Keiichiro
Bell Mark L.
Jones Deborah
NGK Insulators Ltd.
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