Method for protecting shaped articles from attack by water
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United States of America Patent
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Oct 24, 1995
Issued Date -
N/A
app pub date -
Feb 3, 1993
filing date -
Jun 15, 1989
priority date (Note) -
Expired
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Abstract
An article is provided which has a surface which is contactable in use with water at a temperature of at least 100.degree. C. The surface of the article is protected from attack by the water, because it is formed of a shaped fired ceramic material which is formed from particulate zirconia having a coating on the particles thereof of a hydrous oxide of yttrium and optionally also a hydrous oxide of zirconium, titanium or aluminum. Preferably the particles have a diameter of not more than 0.5 micron and the amount of hydrous oxide of yttrium falls within the range 0.5 to 10 mole percent as Y.sub.2 O.sub.3 on moles of zirconia. Typical articles are internal combustion engines and parts thereof, mills and impact plates therefor, and pump surfaces. Fuel cells are also described.
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