Compositions: ceramic – Ceramic compositions – Refractory
Patent
1991-03-18
1993-04-06
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Refractory
501 95, 501154, 501 92, 501 96, 501 98, 427 70, 4272552, C04B 3558, C04B 4187, C04B 3800, C23C 1634
Patent
active
052003736
ABSTRACT:
The present invention is a composite ceramic structure having a porosity of 5 to 40% by volume comprising particles selected from the group consisting of grains and whiskers of at least one inorganic compound AB, where B is oxygen, nitrogen or carbon and A is any metal so the difference in electronegativity between A and B is less than 1.7; or particles selected from the group consisting of grains and whiskers of an inorganic compound, where there is a difference of 1.7 and higher between the components, and having layers of the inorganic compound AB formed on the surfaces of the particles. The particles are bonded together by silicon nitride particles having an average particle size of less than 0.2 micron. The composite ceramic structure is produced by sintering a shape composed of particles of AB or composed of particles having layers of AB formed on the surfaces of the particles in a gaseous atmosphere containing silicon and nitrogen to grow silicon nitride particles on the surfaces of the shaped inorganic particles.
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Chiba Akio
Miyoshi Tadahiko
Sakai Junji
Sobue Masahisa
Watahiki Seiji
Bell Mark L.
Bonner C. M.
Hitachi , Ltd.
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