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An inorganic fiber-reinforced ceramic composite material comprising a matrix of a ceramic and inorganic fibers as a reinforcing material, characterized in that (a) the inorganic fibers are specified inorganic fibers containing silicon, either titanium or zirconium, nitrogen and oxygen, and (b) the c

An inorganic fiber-reinforced ceramic composite material comprising a matrix of a ceramic and inorganic fibers as a reinforcing material, characterized in that (a) the inorganic fibers are specified inorganic fibers containing silicon, either titanium or zirconium, nitrogen and oxygen, and (b) the ceramic is at least one material selected from the group consisting of carbides, nitrides, oxides, glass ceramics, graphite and specified inorganic materials containing silicon, either titanium or zirconium, nitrogen and oxygen.

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An inorganic fiber-reinforced ceramic composite material comprising a matrix of a ceramic and inorganic fibers as a reinforcing material, characterized in that (a) the inorganic fibers are inorgnic fibers containing silicon, either titanium or zirconium, nitrogen and oxygen and being composed of (i)

An inorganic fiber-reinforced ceramic composite material comprising a matrix of a ceramic and inorganic fibers as a reinforcing material, characterized in that (a) the inorganic fibers are inorgnic fibers containing silicon, either titanium or zirconium, nitrogen and oxygen and being composed of (i) an amorphous material consisting substantially of Si, M, N and O, or (ii) an aggregate consisting substantially of ultrafine crystalline particles with a particle diameter of not more than 500 Åof Si2N2O, MN, Si3N4 and/or MN1-x, and amorphous SiO2 and MO2, provided that in the above formulae, M represents titanium or zirconium, and x is a number represented by 01, or (iii) a mixture of the amorphous material (i) and the aggregate (ii), and (b) the ceramic is at least one material selected from the group consisting of carbides, nitrides, oxides, glass ceramics, graphite and inorganic materials containing silicon, either titanium or zirconium, nitrogen and oxygen and composed of (i) an amorphous material consisting substantially of Si, M, N and O, or (ii) an aggregate consisting substantially of ultrafine crystalline particles with a particle diameter of not more than 500 Åof Si2N2O, MN, Si3N4 and/or MN1-x and amorphous SiO2 and MO2, provided that in the above formulae, M represents titanium or zirconium, and x is a number represented by 01, or (iii) a mixture of the amorphous material (i) and the aggregate (ii).