Process for making zirconia-alumina

Details Process for making zirconia-alumina Process for making zirconia-alumina

1988-05-16

1991-07-16

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501103, 423600, 423608, 264 13, C04B 3510, C04B 3548

Patent

active

050325558

ABSTRACT:
Zirconia toughened alumina (ZTA) is produced from precursor salts. The precursor salts are coprecipitated from solution to yield a gel in a liquid phase. The gel in excess of the critical temperature and pressure is dried at a temperature and pressure in excess of the critical temperature and pressure of the liquid phase to thereby convert the liquid phase to a gas. The solid particles, when separated from the gas, form a fine particulate ZTA which, upon consolidation yields near theoretical density toughened ceramics.

REFERENCES:
patent: 4429051 (1984-01-01), Davidgeet et al.
patent: 4501818 (1985-02-01), Rossi
patent: 4532224 (1985-07-01), Hori
patent: 4574003 (1986-03-01), Gerk
patent: 4626518 (1986-12-01), Watanabe et al.
patent: 4649037 (1987-03-01), Marsh et al.
patent: 4665040 (1987-05-01), Kurita et al.
patent: 4845056 (1989-07-01), Yamanis
Condensed Chemical Dictionary, Hawley, (1974) p. 412.
Murase et al., "Stability of ZrO.sub.2 Phases in Ultrafine ZrO.sub.2 -Al.sub.2 O.sub.3 Mixtures", J. of Am. Cer. Soc. vol. 69 No. 2 (1986).

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