Surface etching before electroding zirconia exhaust gas oxygen s

Details Surface etching before electroding zirconia exhaust gas oxygen s Surface etching before electroding zirconia exhaust gas oxygen s

1980-08-13

1982-03-09

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

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

Patent

active

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.

REFERENCES:
patent: 3978006 (1976-08-01), Topp et al.
patent: 4021326 (1977-05-01), Pollner et al.
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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