Hydrothermal comminution or zirconia or hafnia

Details Hydrothermal comminution or zirconia or hafnia Hydrothermal comminution or zirconia or hafnia

1987-07-06

1988-09-20

Rosenbaum, Mark

Solid material comminution or disintegration

Processes

241 23, 241 29, 501103, B02C 1912

Patent

active

047719508

ABSTRACT:
Zirconia ceramics containing substantial amounts of metastable tetragonal phase crystallites, so that they are tougher than most other ceramics, can be completely comminuted to powders, without applying any mechanical force, by treatment with water or steam at temperatures well above room temperature. This type of comminution is particularly useful for small, often hollow, spheres produced by rapidly solidifying melts of zirconia and a stabilizing oxide such as yttria. These spheres can be almost completely comminuted to a size suitable for wet vibratory milling by treatment for twenty-four hours at 250 C under sufficient steam pressure to maintain some liquid water in equilibrium.

REFERENCES:
patent: 4501818 (1985-02-01), Rossi
patent: 4565792 (1986-01-01), Knapp
Yoshimura et al., "Role of H.sub.2 O on the Degradation Process of Y-TZP", Journal of Materials Science Letters, vol. 6, pp. 465-467 (1987).

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