Preparation method of dense sintered bodies for solid electrolytes
AssigneeSumitomo Chemical Company, Limited
InventorsKenji Nakane, Tetsu Umeda, Masahide Mohri
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Abstract
A method of preparing dense sintered bodies of beta alumina suitable for solid electrolytes, which comprises preparing a shaped body from a mixture containing an aluminum powder, a sodium compound, a structure stabilizer and a zirconia powder or from a mixture containing an aluminum powder, an alumina powder, a sodium compound, a structure stabilizer and a zirconia powder, and reaction-sintering the shaped body.
Claims6
A method of preparing a dense body formed of beta alumina which has a relative density of at least 85% for a solid electrolyte, which comprises steps of
- (1) shaping a mixture consisting essentially of, on the basis of a total amount of the mixture, 1% to 40% by weight of a sodium compound, 0.1% to 10% by weight of a structural stabilizer, an effective amount of a zirconia powder to promote oxidation of an aluminum powder, and the balance of an aluminum powder into a shaped body, and
- (2) reaction-sintering the shaped body at 1200.degree. to 1600.degree. C. so as to convert substantially the aluminum to beta alumina.
A method of preparing a dense body formed of beta alumina which has a relative density of at least 85% for a solid electrolyte, which comprises the steps of
- (1) shaping a mixture consisting essentially of, on the basis of a total amount of the mixture, 1% to 40% by weight of a sodium compound, 0.1% to 10% by weight of a structural stabilizer, an effective amount of a zirconia powder to promote oxidation of an aluminum powder, and the balance of aluminum powder and alumina powder in which the amount of the aluminum powder is at least 10% by weight,
- (2) reaction-sintering the shaped body at 1200.degree. to 1600.degree. C. so as to convert substantially the aluminum to beta alumina.
Dependencies are inferred from the claim text.