Optically black cobalt surface

Details Optically black cobalt surface Optically black cobalt surface

1988-08-31

1990-02-27

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

126901, 204 376, 204 41, 428469, C25D 1102, C25D 550

Patent

active

049043536

ABSTRACT:
The present invention resides in the discovery that an optically black electroplated cobalt/cobalt oxide surface which has been anodized and then preferably calcined has both a high emissivity and high absorptivity, and is stable against loss of absorptivity at temperatures of more than 450.degree. C. for prolonged periods. Preferably, the optically black cobalt oxide surfaces of the present invention have an absorptivity of at least about 0.96 and an emissivity of at least about 0.6.

REFERENCES:
patent: 3944440 (1976-03-01), Franz
patent: 4080269 (1978-03-01), Scholz et al.
patent: 4177325 (1979-12-01), Roberts et al.
patent: 4392920 (1983-07-01), McDonald
patent: 4473447 (1984-09-01), Gutwein et al.
patent: 4777936 (1988-10-01), Arai
Metal Finishing Guidebook and Directory for 1975, Metals and Plastics Publications, Hackensack, N.J., p. 497.
"Preliminary Study of a Solar Selective Coating System Using Black Cobalt Oxide for High Temperature Solar Collectors", G. McDonald, American Vacuum Society, Apr. 21-25, 1980, Paper No. 14.
"Solar Selective Black Cobalt: Preparation, Structure, and Thermal Stability", Smith et al., J. Appl. Phys., 51(8), August, 1980, pp. 4186-4196.
"Selective Radiation Coatings, Preparation and High Temperature Stability", Kokoropoulus et al., Solar Energy, Vol. 3(4), 1959, pp. 19-23.

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