Compositions: ceramic – Ceramic compositions – Refractory
Patent
1989-04-10
1992-07-07
Group, Karl
Compositions: ceramic
Ceramic compositions
Refractory
501 92, 501 97, 501 98, C04B 3558
Patent
active
051282852
ABSTRACT:
Silicon oxynitride sintered body is obtained by sintering a base starting material mixture comprising silicon oxynitride component
and a solution of at least one alkoxide selected from alkoxides of at least one element selected from the group consisting of Al, Sc, Y and rare-earth elements.
Fiber-reinforced ceramic sintered body is obtained by sintering the base starting material mixture further inclusing 5-40% by weight of SiC whiskers and/or .beta.-Si.sub.3 N.sub.4 whiskers, wherein alkoxide component is 0.5-30% by weight as oxides.
The alkoxide component is deposited on the other material powders and calcined to provide well dispersed oxide layer on the powder surface which forms uniform matrix phase giving high density by sintering. Sintered bodies (with or without whiskers) have low deterioration at high temperatures.
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M. Ohashi et al., "Mechanical Properties of Hot-Pressed Silicon Oxynitride Ceramics", Paper No. 3A25, Yogyo Kyokai Nenkai Yokoshu, 1987.
M. Mitomo et al., (Reprint of the 25th Ceramic Fundamental Forum), Paper No. 1A18, Yogyo Kiso Toronkai Koen Yoshi Shu, 1987.
Lewis et al., "Pressureless-sintered Ceramics Based on the Compound Si.sub.2 N.sub.2 O", Materials Science and Engineering, 71. pp. 87-94, 1985.
Iio Satoshi
Watanabe Masakazu
Yokoi Hitoshi
Group Karl
NGK Spark Plug Co. Ltd.
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