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Ceramic composite comprising a continuous phase of an alkali metal ion conductor and a continuous phase of a ceramic oxygen ion conductor, and a method for forming the ceramic composite
Ceramic composite comprising a continuous phase of an alkali metal ion conductor and a continuous phase of a ceramic oxygen ion conductor, and a method for forming the ceramic composite
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机译:包含碱金属离子导体的连续相和陶瓷氧离子导体的连续相的陶瓷复合材料及其形成方法
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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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