Porous silicon nitride with rodlike grains oriented

Details Porous silicon nitride with rodlike grains oriented Porous silicon nitride with rodlike grains oriented

1997-04-29

1999-08-10

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 80, 501 972, C04B 35584

Patent

active

059358882

ABSTRACT:
An object of the present invention is to provide a high-porosity, high-strength porous silicon nitride having great tolerance with respect to strain and stress, and a method for producing the same, and the present invention relates to a high-porosity, high-strength porous silicon nitride having great tolerance with respect to strain and stress, characterized in that rodlike grains of silicon nitride with a minor diameter of 0.5 to 10 .mu.m and an aspect ratio of 10 to 100 are oriented in a single direction, and the rest of the structure other than the rodlike grains consists solely of pores with a porosity of 5 to 30%, and further the above-mentioned porous silicon nitride is produced by mixing rodlike particles of silicon nitride with a minor diameter of 0.5 to 10 .mu.m and an aspect ratio of 10 to 100 as the silicon nitride with an auxiliary that serves to bind the rodlike particles, forming a tape in which the silicon nitride rodlike particles are oriented in a single direction by sheet forming, extrusion forming, or another such forming process, and sintering this product in a nitrogen atmosphere after lamination and degreasing of it.

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Journal of Ceramic Society of Japan, vol. 97, No. 8, pp. 872-874, 1989, Yoshio Ukyo, et al., "High Strenth Si.sub.3 N.sub.4 Ceramics".
Journal of the Ceramic Society of Japan, vol. 103, No. 4 pp. 407-408, 1995, Masashi Yoshimura, et al., "Grain Size Controlled High-Strength Silicon Nitride Ceramics".

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