Method of making a stress resistant, partially stabilized...

Details Method of making a stress resistant, partially stabilized... Method of making a stress resistant, partially stabilized...

C - Chemistry, Metallurgy

04

B

25/141

C04B 35/48 (2006.01) C04B 35/486 (2006.01)

Patent

CA 1318111

-14- Abstract of the Disclosure A method is disclosed for making an aging-resistant, partially stabilized zirconia ceramic, which method is not totally dependent upon grain size control, can function to eliminate substantially any monoclinic phase that results from machining such zirconia article, and employs a novel heat treatment to do so. The method particularly comprises: (a) sintering such article at a temperature and for a period of time to produce a densified product having little or no monoclinic crystal phase when cooled to room temperature (i.e. 2550-2650F for .5-4 hours); (b) subjecting the cooled sintered article a machining operation that results in the formation of monoclinic crystal phase on the surface of the part; and (c) heating said treated article to the temperature range of 1800-1950°F (982-1066°C) to re-transform monoclinic crystal structure to tetragonal crystal.

563140

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