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Alkali metal-.beta.- and .beta. '-Alumina and gallate polycrystalline ceramics and their production by the gas phase method
Alkali metal-.beta.- and .beta. '-Alumina and gallate polycrystalline ceramics and their production by the gas phase method
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机译:碱金属-β-和β。 “-氧化铝和没食子酸酯多晶陶瓷及其气相法生产
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摘要
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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