Surface etching before electroding zirconia exhaust gas oxygen s

Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step

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156644, 156667, 204 32R, 204195S, 252 793, 427309, C23F 100

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043187706

ABSTRACT:
A method of substantially increasing porosity and surface area on a zirconia body. The zirconia is etched with a mixture of concentrated hydrofluoric acid and concentrated sulfuric acid in a ratio effective to not only rapidly etch grain boundaries but to also rapidly pit individual zirconia grains. Concurrently the zirconia grains acquire a faceted or angular appearance. Etching is performed at 180.degree.-220.degree. C. for about 0.5-4 hours, along with ultrasonic agitation.

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patent: 4135012 (1979-01-01), Su
patent: 4135040 (1979-01-01), Thornton
patent: 4136000 (1979-01-01), Davis et al.
patent: 4138881 (1979-02-01), Isenberg

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