NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Durability of Solar Selective Coatings in a Simulated Space EnvironmentSolar selective coatings are being considered for heat engine and thermal switching applications on minisatellites. Such coatings must have the combined properties of high solar absorptance and low infrared emittance. High solar absorptance is needed to collect solar energy as efficiently as possible while low infrared emittance is needed to minimize radiant energy loss at operating temperature. These properties are achieved in sputter deposited thin films through the use of molecular mixtures of metal and dielectric. Solar selective coatings having a solar absorptance to infrared emittance ratio of 9 have been successfully deposited using a mixture of nickel and aluminum oxide. The space environment, however, presents some challenges for the use of materials on the exterior of spacecraft, including durability to atomic oxygen and vacuum ultraviolet radiation. To address these concerns, several candidate solar selective coatings were exposed to atomic oxygen in a plasma asher and to ultraviolet radiation in a vacuum facility equipped with calibrated deuterium lamps. The optical properties of the coatings were monitored as a function of time to evaluate their performance over long term exposure to the simulated space environment. Several coatings were found to be durable to both the atomic oxygen and the vacuum ultraviolet environments.
Document ID
20020071015
Document Type
Preprint (Draft being sent to journal)
Authors
Jaworske, Donald A. (NASA Glenn Research Center Cleveland, OH United States)
Lyons, Valerie
Date Acquired
September 7, 2013
Publication Date
January 1, 2002
Subject Category
Chemistry and Materials (General)
Meeting Information
34th International SAMPE Technical Conference(Baltimore, MD)
Funding Number(s)
PROJECT: RTOP 274-00-00
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

NameType 20020071015.pdf STI