Method for manufacture of porous refractory articles
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United States of America Patent
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Nov 7, 1989
Issued Date -
N/A
app pub date -
Dec 22, 1988
filing date -
Dec 2, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The alkali metal content of unfired porous ceramic shapes is substantially reduced by treatment with water to remove excess alkali and treatment with a dilute aqueous solution of an ammonium salt, preferably ammonium chloride, to exchange ammonium ion for remaining alkali metal ion, such that, upon firing, porous ceramic articles are produced having improved stability in high temperature and/or temperature-cycled environments.
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