Method of improving impact resistance of ceramic bodies, and imp

Details Method of improving impact resistance of ceramic bodies, and imp Method of improving impact resistance of ceramic bodies, and imp

1974-04-24

1976-04-27

Van Balen, William J.

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156 89, 264259, 428410, 428426, 428539, B32B 1700

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039536360

ABSTRACT:
A method of improving the impact resistance of bodies of polycrystalline ceramic such as alumina, silicon nitride and silicon carbide, and bodies produced by the method. The body is provided with a layer of a low elastic modulus polycrystalline ceramic material which has microcracks therein, formed by such factors as thermalexpansion coefficient anisotropy, differences in thermalexpansion coefficients between phases of the material, and by changes in volume during phase transformations in the material. The layer can be applied by preforming the layer and then applying, or by hot pressing the material of the layer onto the body.

REFERENCES:
patent: 2943008 (1960-06-01), Saunders
patent: 3468750 (1969-09-01), Pfeifer et al.
patent: 3505158 (1970-04-01), Murray
patent: 3540915 (1970-11-01), Kirchner
patent: 3652378 (1972-03-01), Mistler
patent: 3713877 (1973-01-01), Kirchner et al.

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