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Proceedings Paper

High-emittance surfaces for high-temperature space radiator applications
Author(s): Bruce A. Banks; Sharon K. Miller; Deborah Hotes
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Paper Abstract

Anticipated space power systems which employ nuclear or solar dynamic power technologies may be required to reject waste heat at temperatures up to 950K. High temperature radiators will be required to have high thermal emittance surfaces which are durable to elevated temperatures as well as the operational space environment. Additional performance and durability threats such as extreme temperature variations and low earth orbital atomic oxygen impose challenging constraints upon the selection of suitable radiator surfaces. Traditional surface coatings which are acceptable for high emittance low temperature radiators may spall or degrade in an environment where large temperature changes high temperatures and atomic oxygen is present. Surface roughening and/or chemical modifications which produce high emittance surfaces that are an integral part of the radiator substrate may have much greater durability than coatings applied to radiator substrates. A variety of surface modification techniques have been evaluated for emittance enhancement of radiator surfaces. These techniques include: acid etching heat treating abrasion sputter texturing electro-chemical texturing arc texturing and atomic oxygen beam texturing. Candidate radiator surface materials investigated include: Nb-1 Zr Cu Ti Ti-6 Al-4 v 304 stainless steel Al6061-T6 Mo W and Ta. Results of durability evaluation of selected radiator surfaces in an atomic oxygen environment is also presented. 1.

Paper Details

Date Published: 1 January 1991
PDF: 12 pages
Proc. SPIE 1330, Optical Surfaces Resistant to Severe Environments, (1 January 1991); doi: 10.1117/12.47527
Show Author Affiliations
Bruce A. Banks, NASA/Lewis Research Ctr. (United States)
Sharon K. Miller, NASA/Lewis Research Ctr. (United States)
Deborah Hotes, Cleveland State Univ. (United States)

Published in SPIE Proceedings Vol. 1330:
Optical Surfaces Resistant to Severe Environments
Solomon Musikant, Editor(s)

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