Impact resistive ceramic bodies, and method of making same

Details Impact resistive ceramic bodies, and method of making same Impact resistive ceramic bodies, and method of making same

C - Chemistry, Metallurgy

04

B

117/114, 154/89

C04B 35/111 (2006.01) B32B 3/00 (2006.01) C04B 35/565 (2006.01) C04B 35/584 (2006.01) C04B 41/50 (2006.01) C04B 41/87 (2006.01) F01D 5/28 (2006.01)

Patent

CA 1049343

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 low elastic modulus polycrystalline ceramic material which has micro- cracks 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.

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