Manufacture of beta-alumina artifacts

Details Manufacture of beta-alumina artifacts Manufacture of beta-alumina artifacts

1988-09-30

1990-04-03

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 86, 156 89, B32B 1800, B32B 3126

Patent

active

049137549

ABSTRACT:
The invention provides a method of making a composite beta-alumina artifact, such as a separator tube for an electrochemical cell, comprising two beta-alumina portions which are sealed together in a sealing zone, namely an inner portion and an outer portion which extends peripherally around the inner portion and embraces it in the sealing zone. The method comprises pressing the inner and outer portions from powders which, when sintered, shrink and form integral beta-alumina artifacts. The portions are then arranged so that the outer portion extends around the inner portion and embraces it in a sealing zone. The portions are then sintered to cause them to seal together hermetically in the sealing zone while converting each of the portions into a beta-alumina artifact. The portions are made so that the outer portion undergoes a greater degree of shrinkage during sintering than the inner portion and the portions are pressed so that the spacing between the portions where the outer portion extends around and embraces the inner portion is such that, upon sintering, the outer portion shrinks on to the inner portion to provide a hermetic peripheral seal between the portions.

REFERENCES:
patent: 3564328 (1971-02-01), Bagley et al.
patent: 4038462 (1977-07-01), Rohr
patent: 4132820 (1979-01-01), Mitoff
patent: 4299638 (1981-11-01), Matsuhisa
patent: 4721541 (1988-01-01), Hodges
J. R. Redding et al., Novel Ceramic Bonding Techniques for CO.sub.2 Waveguide Lasers (1987), pp. 269-287.

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