Method of producing silicon nitride ceramics having thermal high

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

1996-12-13

1999-05-11

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Shaping by extrusion

264650, 264656, 264665, 264683, C04B35/584;35/593

Patent

active

059025425

ABSTRACT:
The present invention provides silicon nitride ceramics having high thermal conductivity and a method for production thereof. This invention relates to a method for producing a silicon nitride sintered body having a microstructure with silicon nitride crystals oriented uniaxially and exhibiting high thermal conductivity of 100 to 150 W/mK in the direction parallel to the orientation direction of the crystals, which comprises of preparing a slurry by mixing a mixed powder of a sintering auxiliary, beta-silicon nitride single crystals as seed crystals and a silicon nitride raw powder with a dispersing medium, forming the slurry by tape casting or extrusion forming, calcining the formed silicon nitride body with beta-silicon nitride single crystals oriented parallel to the casting plane to remove the organic components, densifying it by hot pressing and the like if required, and further annealing it at 1700 to 2000.degree. C. under the nitrogen pressure of 1 to 100 atmospheres.

REFERENCES:
patent: 4388255 (1983-06-01), Simpson
patent: 4603116 (1986-07-01), Smith
patent: 4886767 (1989-12-01), Goto et al.
patent: 5603877 (1997-02-01), Kato et al.
American Ceramic Society Bulletin, vol. 57, No. 12, pp. 1119-1122, 1978, Masaaki Kuriyama, et al., "Thermal Conductivity of Hot-Pressed Si.sub.3 N.sub.4 by the Laser Flash Method".
Journal of the Ceramic Society of Japan, vol. 92, No. 2, pp. 174-181, 1989, Koji Watari, et al., "Temperature Dependence of Thermal Coefficients for HIPped Silicon Nitride".
Journal of Materials Science Letters, vol. 3, pp. 915-916, 1984, M. Mitomo, et al., "Thermal Conductivity of .alpha.-Sialon Ceramics".
Journal of the Ceramic Society of Japan, vol. 101, No. 9, pp. 1078-1080, 1993, Kiyoshi Hirao, et al., "Preparation of Rod-Like .beta.-Si.sub.3 N.sub.4 Single Crystal Particles".

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