| 摘要 |
A composite ceramic material reinforced with silicon carbide whiskers consists essentially of 5 to 45% by weight of SiC whiskers, 3 to 20% by weight of at least one selected from the group consisting of oxides and oxynitrides of zirconium calculated on zirconium, and the balance being a SiZlON-based ceramic substance. The SiAlON-based ceramic substance consists essentially of a substance selected from the group consisting of beta -SiAlON represented by a compositional formula of Si6-zAlzOzN8-z (where 0<z</=1) and an alpha , beta -composite SiAlON made up of said beta -SiAlON and an alpha -SiAlON of the formula Mx (Si,Al)12(O,N)16, where M denotes at least one selected from the group consisting of Li, Ca, Mg, Y and rare earth metals and 0<x</=2; and 1 to 25% by weight of a glass phase containing therein Zr, Si, Al, O and N, or further at least one selected from the group consisting of Y, Mg, Ca and rare earth metals. This composite material has high strength and toughness suitable for articles requiring high wear and heat resistance such as cutting tools or ceramic valves for internal combustion engines.
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