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AssigneeHitachi, Ltd.
InventorsHironori Kodama, Takaaki Suzuki, Kie Nakamura, Kunihiro Maeda
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A composite ceramic sintered body is made from a ceramic matrix comprised mainly of silicon nitride, silicon oxynitride or an inorganic oxide selected from alumina, mullite, zirconia, high silica glass, lithium-aluminosilicate glass, magnesium-aluminosilicate glass or barium-magnesium-aluminosilicate glass, containing both whiskers and particles of a material selected from silicon carbide, silicon nitride, silicon oxynitride, alumina and zirconia dispersed therein. The whiskers have a diameter of 0.1 to 5 .mu.m and the particles have an average particle size of 5 to 60 .mu.m. The composite ceramic sintered body is homogeneous and isotropic, and it has a high strength and high toughness at a high temperature and an excellent heat resistance and oxidation resistance.
A composite ceramic sintered body which comprises a ceramic matrix comprised mainly of a ceramic matrix of silicon nitride, silicon oxynitride or an inorganic oxide, said matrix having an average particle size of less than 10 .mu.m, said matrix containing whiskers and particles of a ceramic material having a higher melting point than the sintering temperature of said matrix uniformly dispersed therein, said whiskers having diameters in the range of 0.1 to 5 .mu.m and being in an amount of 1 to 50 % and said particles having an average particle size of 10 to 50 .mu.m, which size is greater than the average particle size of the matrix particles and being in an amount of 1 to 30 wt %, said amounts being based on said composite ceramic body.
A composite ceramic sintered body which comprises a ceramic matrix made of silicon nitride having an average particle size of 10 .mu.m;
A composite ceramic sintered body which comprises a ceramic matrix made of silicon nitride;
Dependencies are inferred from the claim text.