Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Include electrolyte chemically specified and method
Patent
1995-02-27
1996-08-13
Kalafut, Stephen
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Include electrolyte chemically specified and method
501120, H01M 1039
Patent
active
055454950
ABSTRACT:
A magnesia-based beta alumina sintered body having the following features:
(1) the average crystalline particle diameter of beta alumina crystals as calculated assuming that the beta alumina crystals are of a circular section is in a range of 1-4 .mu.m;
(2) the amount of the beta alumina crystals having particle diameters not more than 5 .mu.m is 85% to 98% when measured in a plane;
(3) the maximum crystalline particle diameter is not more than 300 .mu.m, and the number of coarse particles having diameters falling in a range of 100 .mu.m to 300 .mu.m is not more than 1 as counted in an area of 10 mm.times.10 mm; and
(4) the content of crystals of sodium aluminate is 0.5 wt % to 6.0 wt %. A process for producing such a magnesia-based beta alumina sintered body is also disclosed.
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Ceramic Bulletin, vol. 58, No. 5 (1979), "A Prepilot Process for the Fabrication of Polycrystalline .beta."-Alumina Electrolyte Tubing, pp. 522-526.
Stevens et al., Journal of Materials Science, V. 19, pp. 695-715 (1984) "Review, Structure, Properties and Production of Beta-Alumina".
Kalafut Stephen
NGK Insulators Ltd.
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