Application of an alumina coating to oxide whisker-covered surfa

Details Application of an alumina coating to oxide whisker-covered surfa Application of an alumina coating to oxide whisker-covered surfa

1980-03-31

1981-07-21

Shine, W. J.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252463, 252477R, 4232135, B01J 2104, B01J 2386

Patent

active

042797829

ABSTRACT:
In a preferred embodiment, a method is disclosed for applying a gamma alumina coating to a metal foil composed of an aluminum-containing ferritic stainless steel alloy and having an oxidized surface that is substantially covered by high-aspect alumina whiskers. The method comprises wetting the whisker-covered surface with a thixotropic alumina gel formed by mixing between about 4% to 6% by weight alumina monohydrate in water and acidifying with nitric acid to a pH below 2.0. While still wet, the primed surface is coated with a material consisting of gamma alumina powder suspended in a similar acid-stabilized aqueous alumina gel. The two-coat layer is air-dried and additional layers of the powder-containing material are applied and dried to form a gamma alumina coating of desired thickness.

REFERENCES:
patent: 3957692 (1976-05-01), Cairns et al.
patent: 4096095 (1978-06-01), Cairns
patent: 4196099 (1980-04-01), Hunter et al.

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