Selective absorber of solar energy and process for producing sam

Details Selective absorber of solar energy and process for producing sam Selective absorber of solar energy and process for producing sam

1981-02-06

1982-06-01

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 627, 148 63, 427160, C23F 706, C23F 726

Patent

active

043326285

ABSTRACT:
A selective absorber of solar energy employing an aluminum alloy sheet as a substrate on which a chemical conversion coating is initially formed. The coating is thereafter heat-treated into an oxidized, dark-colored coating of selective solar absorption nature. Also disclosed is a process for producing the absorber. The process comprises a chemical conversion treatment step for formation of the initial coating, and a high-temperature oxidation treatment step for final formation of the selective coating. The latter step includes preventing atmosphere in the vicinity of the substrate surface from circulating.

REFERENCES:
patent: 2544139 (1951-03-01), Deyrup et al.

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