Alkali-metal-.beta.- and .beta."-alumina and gallate polycrystalline ceramics and fabrication by a vapor phase method
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United States of America Patent
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Sep 12, 2000
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app pub date -
Jan 2, 1998
filing date -
Jan 2, 1998
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Abstract
A ceramic composite containing alkali-metal-.beta.- or .beta.'-alumina and an oxygen-ion conductor is fabricated by converting .alpha.-alumina to alkali-metal-.beta.- or .beta.'-alumina. A ceramic composite with continuous phases of .alpha.-alumina and the oxygen-ion conducting ceramic, such as zirconia, is exposed to a vapor containing an alkali-metal oxide, such as an oxide of sodium or potassium. Alkali metal ions diffuse through alkali-metal-.beta.- or .beta.'-alumina converted from .alpha.-alumina and oxygen ions diffuse through the oxygen-ion conducting ceramic to a reaction front where .alpha.-alumina is converted to alkali-metal-.beta.- or .beta.'-alumina. A stabilizer for alkali-metal-.beta.'-alumina is preferably introduced into the .alpha.-alumina/oxygen-ion conductor composite or introduced into the vapor used to convert the .alpha.-alumina to an alkali-metal-.beta.'-alumina.
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