Method of producing porous silicon nitride ceramics having high

Details Method of producing porous silicon nitride ceramics having high Method of producing porous silicon nitride ceramics having high

1997-01-29

1999-10-19

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Of inorganic materials

264628, 264638, 264639, 264650, 264683, C04B 34584, C04B 3800

Patent

active

059684267

ABSTRACT:
The present invention relates to a method for producing a porous silicon nitride sintered body having high strength and low thermal conductivity, which comprises of adding more than 10 volume % of rodlike beta-silicon nitride single crystals with a larger mean diameter than that of a silicon nitride raw powder into a mixture comprising the silicon nitride raw powder and a sintering additive, preparing a formed body with rodlike beta-silicon nitride single crystals oriented parallel to the casting plane according to a forming technique such as sheet casting and extrusion forming, sintering said formed body to develop elongated silicon nitride grains from the added rodlike beta-silicon nitride single crystals as nuclei and obtain the sintered body with the elongated grains being dispersed in a complicated state.

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Nielsen, "Strength and Stiffness of Porous Materials," J. Am. Ceram. Soc., 73 [9], 1990, pp. 2684-2689.
Hirao et al., "Preparation of Rod-Like Beta-Si.sub.3 N.sub.4 Single Crystal Particles," Journal of the Ceramic Society of Japan, 101 [9], 1993, pp. 1078-1080.

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