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High Temperature Solar Reflector, Its Preparation and UseA coating-substrate combination having high specular reflectivity at high temperatures reaching 8000 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 A to 3000 A. A 300 A to 5000 A 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.
Document ID
20000025503
Document Type
Other - Patent
Authors
Jaworske, Donald A. (NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
August 19, 2013
Publication Date
June 15, 1999
Subject Category
Energy Production and Conversion
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-Case-LEW-16411-1|US-Patent-5,912,777
Patent Application
US-Patent-Appl-SN-903195

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