Partially stabilised zirconia ceramics

Details Partially stabilised zirconia ceramics Partially stabilised zirconia ceramics

C - Chemistry, Metallurgy

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C04B 35/48 (2006.01) B21C 3/02 (2006.01) B21C 25/02 (2006.01) B23B 27/14 (2006.01) C04B 35/486 (2006.01) F01L 1/14 (2006.01) F02F 7/00 (2006.01) G01N 3/00 (2006.01)

Patent

CA 1135728

ABSTRACT A magnesia partially stabilised zirconia ceramic material possessing from about 2.8 to about 4.0 wt per cent magnesia, and made from a zirconia powder containing no more than about 0.03 per cent silica is described. The ceramic material has a microstructure, produced as a consequence of the method by which the material is made, which provides both high strength and good thermal shock resistance properties. This micro- structure comprises grains of cubic stabilised zirconia within which are formed, during cooling from the firing temperature, precipitates of tetragonal zirconia. These precipitates are elliptical in shape, with a long axis of about 1500 Angstrom units. Additionally, some of the tetragonal zirconia precipitates are made to transform into a non-twinned microcrystalline monoclinic form of zirconia by reducing the temperature of the material to below 800°C, then subsequently holding the material at a temperature in the range from l000°C to about 1400°C. The ceramic material may also contain up to 36 wt per cent of hafnia. Such materials can be used for, inter alia, moulds, dies, tappet facings and cutting tools.

342985

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