Stabilized metal oxide powder composition

Details Stabilized metal oxide powder composition Stabilized metal oxide powder composition

1990-05-23

1992-01-14

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 94, 501102, 501103, C04B 3502, C04B 3548, C04B 3549

Patent

active

050810812

ABSTRACT:
A composition suitable for use in the manufacture of a ceramic material comprises free-flowing substantially non-aggregated particulate zirconia. A substantial proportion of the zirconia is present in the tetragonal crystalline form and the particles of zirconia contain alumina in an amount of from 1 to 10% by weight expressed as Al on ZrO.sub.2. The particles are substantially free of silica.
The particles of zirconia can be coated with an oxide or hydrous oxide of a stabilizing agent for zirconia such as an oxide or hydrous oxide of yttrium, calcium, magnesium, barium, strontium or cerium.
An oxidation process is described for the manufacture of the tetragonal crystalline zirconia by the oxidation of zirconium halide in the presence of aluminium halide at high temperature in the vapor phase.

REFERENCES:
patent: 2488439 (1949-11-01), Schaumann
patent: 4145403 (1979-03-01), Fey
patent: 4748138 (1988-05-01), Watanabe et al.
patent: 4769351 (1988-09-01), Soumiya et al.

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