Metallic oxides
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United States of America Patent
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Aug 9, 1994
Grant Date -
N/A
app pub date -
Nov 3, 1992
filing date -
Nov 2, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for coating particulate zirconia for use in ceramics is claimed. The particulate zirconia is coated with a hydrous oxide of a stabilizing metal such as yttrium, an alkaline earth metal or a rare earth metal by hydrolysis of a salt of the metal. An initial dispersion of the zirconia is prepared at a pH above 7.5 and, preferably, in the presence of an organic dispersing agent. The coated zirconia produced according to the process has been shown to form ceramic bodies with a higher strength than those prepared from particulate zirconia coated by prior known processes.
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