Fabrication of spectrally selective solar surfaces by the therma

Details Fabrication of spectrally selective solar surfaces by the therma Fabrication of spectrally selective solar surfaces by the therma

1979-04-20

1981-05-19

Lewis, Michael L.

Metal treatment

Compositions

Heat treating

148 635, 428469, 126901, B32B 1518

Patent

active

042683246

ABSTRACT:
The spectrally selective solar surfaces have been produced after heating the austenitic stainless steel AISI 321 at a firing temperature of 843.degree. K. and for firing times ranging from 10 to 20 minutes. The heating was carried out in a constant temperature oven under normal atmospheric conditions. The optimum values of solar absorptance .alpha..sub.s and near-normal emittance .epsilon..sub.s were found to be .alpha..sub.s =0.92+0.02, .epsilon..sub.s =0.22.+-.0.02 respectively. The corresponding values for the unheated steel were 0.50.+-.0.02 and 0.22.+-.0.22. Severe temperature treatments like quenching in liquid nitrogen at 77.degree. K. produced no adverse visible affect on the quality of the selective surfaces. It shows that the thermal coatings so produced are very tough and durable. The value of solar absorptance and near-normal thermal emittance remained unchanged after quenching in liquod nitrogen.
The thermal coatings so produced not only offer a technical advantage but also economic advantage over any of the existing techniques for the manufacture of stainless steel solar panels.

REFERENCES:
patent: 2917817 (1959-12-01), Tabor
patent: 3660173 (1972-05-01), Matsuno et al.
patent: 3963530 (1976-06-01), Smollett et al.
patent: 4097311 (1978-06-01), Ishibashi et al.
Steel Products Manual, Stainless and Heat Resisting Steels; American Iron and Steel Institute, Washington, D. C., p. 146, (12/74).

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