High temperature solar reflector, its preparation and use

Details High temperature solar reflector, its preparation and use High temperature solar reflector, its preparation and use

1997-06-26

1999-06-15

Spyrou, Cassandra

Optical: systems and elements

Mirror

With support

359884, 359589, 359608, G02B 508

Patent

active

059127775

ABSTRACT:
A coating-substrate combination having high specular reflectivity at high temperatures reaching 800.degree. C. in a vacuum is described. The substrate comprises pure nickel metal or a nickel-containing metal alloy such as stainless steel having a highly polished reflective surface. The coating is a layer of silver deposited on the substrate to a thickness of 300 .ANG. to 3000 .ANG.. A 300 .ANG. to 5000 .ANG. protective coating of silica, alumina or magnesium fluoride is used to cover the silver and to protect it from oxidation. The combination is useful as a parabolic shaped secondary concentrator for collecting solar radiation for generating power or thermal energy for satellite uses. The reflective layer and protective coating preferably are applied to the reflective surface of the substrate by electron beam evaporation or by ion sputtering.

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Jaworske, "Apparatus to Measure the Reflectivity of Silver and Rhodium Mirrors at Elevated Temperatures", vol. 1, pp. 47-49. Proceedings of 31st Intersociety Energy Conversion Conference, Aug. 11, 1996.
Jaworske, "Reflectivity of Silver and Silver-Coated Substrates from 25 Degrees to 800 Degrees C," 32nd Intersociety Energy Conversion Engineering Conference, Jul. 27, 1997. (Advance Copy for Examiner's Info Only) Not Yet Published.

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