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AssigneeMaterials and Systems Research, Inc.
InventorsAnil Vasudeo Virkar, Jan-Fong Jue, Kuan-Zong Fung
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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 α-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 α-alumina/oxygen-ion conductor composite or introduced into the vapor used to convert the alpha-alumina to an alkali-metal-beta″-alumina.
A ceramic composite comprising a continuous phase of an alkali-metal-ion conductor and a continuous phase of a ceramic oxygen-ion conductor,
A ceramic composite comprising a continuous alkali-metal-ion conductor phase of at least one of alkali-metal-beta-alumina or alkali-metal-beta″-alumina and a continuous phase of a ceramic oxygen-ion conductor, the alkali-metal-ion conductor phase free of sinter-formed grain boundary liquid phase.
A ceramic composite comprising a continuous alkali-metal-ion conductor phase of at least one of sodium-metal-beta-alumina or sodium-metal-beta″-alumina and a continuous phase of a ceramic oxygen-ion conductor,
Dependencies are inferred from the claim text.