Method of making a stress resistant, partially stabilized zircon

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

1987-04-13

1989-09-12

Hearn, Brian E.

Compositions: ceramic

Ceramic compositions

Refractory

501152, 264 56, 264 66, C04B 3548

Patent

active

048660140

ABSTRACT:
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.degree.-2650.degree. F. for 0.5-4 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.degree.-1950.degree. F. (982.degree.-1066.degree. C.) to re-transform monoclinic crystal structure to tetragonal crystal.

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"Degradation During Aging of Transformation-Toughened ZrO.sub.2 --Y.sub.2 O.sub.3 Materials at 250.degree. C.", Lange et al., Journal of the American Ceramic Society, vol. 69, pp. 237-240, (1986).

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