Material for selective absorption of solar energy and production

Details Material for selective absorption of solar energy and production Material for selective absorption of solar energy and production

1978-06-13

1984-04-17

Kaplan, G. L.

Stoves and furnaces

Tool having fluid fuel burner

Curling iron

126901, 204 33, 204 35N, 204 42, F24J 302, C25D 1122

Patent

active

044428294

ABSTRACT:
Materials comprising aluminum having a purity of 99.92% by weight or more as a substrate and a porous anodic oxide film of 3.mu. or less in thickness formed on the surface of the substrate and metal particles electrochemically filled in the micropores of the anodic oxide film are used herein to selectively absorb solar energy. This solar energy absorbing characteristic is due to the fact that such materials have a large absorptivity in the visible and near the infrared range and have little emissivity in the infrared range. Such materials are produced by subjecting aluminum having a purity of 99.92% by weight or more to anodic oxidation, and then optionally to anodic electrolysis or alternating current electrolysis in an aqueous solution containing at least one acid selected from the group consisting of phosphoric acid, nitric acid and acetic acid, followed by electrolysis in an aqueous solution containing a metallic salt.

REFERENCES:
patent: 3107159 (1963-10-01), Fetzer
patent: 3634208 (1972-01-01), Kuroda
patent: 3704209 (1972-11-01), Patrie
patent: 3917887 (1975-11-01), Stiller
patent: 3929593 (1975-12-01), Sugiyama
patent: 4022671 (1977-05-01), Asada
patent: 4066816 (1978-01-01), Sheasby
Metal Finishing Guidebook and Directory for 1978; Metals and Plastics Publications, Inc., Hackensack, N.J., p. 538.
The Aluminum Data Book, Reynolds Metals Co., Richmond, Va., 1958, p. 51.

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