Compositions: ceramic – Ceramic compositions – Refractory
Patent
1992-12-23
1994-07-12
Group, Karl
Compositions: ceramic
Ceramic compositions
Refractory
501 98, C04B 3558
Patent
active
053288769
ABSTRACT:
A high-strength silicon nitride sintered body having a flexural strength of 100 kg/mm.sup.2 or higher and a process for producing the same are disclosed, the sintered body comprising not less than 90% by weight of a single crystalline phase of silicon aluminum oxynitride (Si.sub.6-z Al.sub.2 O.sub.z N.sub.8-z, wherein z is a number of from 0 to 4.2) having an average longer diameter of not more than 5 .mu.m and an aspect ratio of not less than 5, the crystal phase constituting a network structure in the sintered body, the balance being a crystalline or amorphous (glassy) phase comprising one or more of oxides or oxynitrides of a rare earth metal, a group 3A metal, a group 2A metal or Si, and the process comprising mixing silicon nitride powder, an organic metal salt as a first sintering aid, and at least one of a metal oxide, a metal nitride, and a metal oxynitride as a second sintering aid, either separately or as a mixture of two or more thereof, with a solvent and a surface active agent, subjecting the mixture or mixtures to ultrasonic dispersion, mixing the mixtures together followed by drying to obtain a mixed powder, molding the mixed powder, and sintering the molded article at a temperature of from 1,600.degree. C. to 2,200.degree. C. in a non-oxidative atmosphere.
REFERENCES:
patent: 4127416 (1978-11-01), Lumby et al.
patent: 4812298 (1989-03-01), Kohtoku et al.
patent: 4816428 (1989-03-01), Kishi et al.
Chemical Abstracts, vol. 106, No. 4, Jan. 1987, abstract No. 22274b Journal of Materials Science, vol. 24, No. 5, May 1989, pp. 1853-1861.
Higuchi Matsuo
Honda Masaaki
Kuibira Akira
Matsunuma Kenji
Miyake Masaya
Bonnar C. M.
Group Karl
Sumitomo Electric Industries Ltd.
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