Method for protecting shaped articles from attack by water

Plastic and nonmetallic article shaping or treating: processes – Treating shaped or solid article

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Details

264 56, 427215, 427331, 4274193, B29C 7100

Patent

active

054607701

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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R. Stevens, "Zironia And Zironia Ceramics," Second Edition, pp. 28-31, Jul., 1986.

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