Composite ceramic material reinforced with silicon carbide whisk

Details Composite ceramic material reinforced with silicon carbide whisk Composite ceramic material reinforced with silicon carbide whisk

1987-08-18

1990-08-07

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 92, 501 95, C04B 3556, C04B 3548, C04B 3558

Patent

active

049468073

ABSTRACT:
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 Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z (where 0<z.ltoreq.1) and an .alpha.,.beta.-composite SiAlON made up of said .beta.-SiAlON and an .alpha.-SiAlON of the formula M.sub.x (Si,Al).sub.12 (O,N).sub.16, where M denotes at least one selected from the group consisting of Li, Ca, Mg, Y and rare earth metals and 0<x.ltoreq.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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American Ceramic Society Bulletin 66 [2], pp. 347-352 (1987).

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