Plugging micro-leaks in multi-component, ceramic tubesheets with

Details Plugging micro-leaks in multi-component, ceramic tubesheets with Plugging micro-leaks in multi-component, ceramic tubesheets with

1981-10-19

1985-03-19

LeFevour, Charles F.

Chemistry: electrical current producing apparatus, product, and

Fluid active material or two-fluid electrolyte combination...

Active material in molten state

429193, 296232, H01M 436

Patent

active

045059950

ABSTRACT:
Cracks, in ceramic wall members, on the order of 1 micron or less in width are plugged helium-tight by selectively leaching a component of the wall member with a solvent, letting the resultant leach form a liquid bridge within the crack, removing the solvent and sintering the resultant residue. This method is of particular value for remedying microcracks or channels in a cell member constituting a tubesheet in a hollow fiber type, high temperature battery cell, such as a sodium/sulfur cell, for example.

REFERENCES:
patent: 3499062 (1970-03-01), Geary, Jr. et al.
patent: 3679480 (1972-07-01), Brown et al.
patent: 3968192 (1976-07-01), Hoffman et al.
patent: 4170695 (1979-10-01), Brown et al.
patent: 4226921 (1980-10-01), Tsang

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