High impact resistant ceramic composite

Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing

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501 96, 501 88, C04B 3558

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050325507

ABSTRACT:
A ceramic material and a method of forming a ceramic material which possesses a high impact resistance. The material comprises: (a) a first continuous phase of .beta.-SiC; and (b) a second phase of about 25-40 vol % TiB.sub.2. Al.sub.2 O.sub.3 is preferably used as a densification aid. The material is formed by hot-pressing the mixture at a temperature from greater than about 1800.degree. C. to less than the transition temperature of .beta.-SiC to .alpha.-SiC. The hot-pressing is performed at a pressure of about 2000 psi to about 4000 psi in an inert atmosphere for several hours and results in the formation of a two phase sintered ceramic composite material.

REFERENCES:
patent: 3775137 (1973-11-01), Clougherty et al.
patent: 4327186 (1982-04-01), Murata et al.
patent: 4762810 (1988-08-01), Endo et al.
patent: 4837231 (1989-06-01), Endo et al.
McMurtry et al., "Microstructure and Material Properties of SiC-TiB.sub.2 Particulate Composites", the Ceramic Bulletin, Feb. '67, vol. 66, No. 2.
Seshadri et al., "Fabrication and Mechanical Reliability of SiC-TiB.sub.2 Composites", Third International Symposium, Ceramic Materials and Components for Engines, American Ceramic Society, Las Vegas, Nov. 1988.

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