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Radiation Induced Degradation of the White Thermal Control Paints Z-93 and Z-93PThis paper details a comparison analysis of the zinc oxide pigmented white thermal control paints Z-93 and Z-93P. Both paints were simultaneously exposed to combined space environmental effects and analyzed using an in-vacuo reflectance technique. The dose applied to the paints was approximately equivalent to 5 years in a geosynchronous orbit. This comparison analysis showed that Z-93P is an acceptable substitute for Z-93. Irradiated samples of Z-93 and Z-93P were subjected to additional exposures of ultraviolet (UV) radiation and analyzed using the in-vacuo reflectance technique to investigate UV activated reflectance recovery. Both samples showed minimal UV activated reflectance recovery after an additional 190 equivalent sun hour (ESH) exposure. Reflectance response utilizing nitrogen as a repressurizing gas instead of air was also investigated. This investigation found the rates of reflectance recovery when repressurized with nitrogen are slower than when repressurized with air.
Document ID
19970002925
Acquisition Source
Marshall Space Flight Center
Document Type
Technical Memorandum (TM)
Authors
Edwards, D. L. (NASA Marshall Space Flight Center Huntsville,AL United States)
Zwiener, J. M. (NASA Marshall Space Flight Center Huntsville,AL United States)
Wertz, G. E. (NASA Marshall Space Flight Center Huntsville,AL United States)
Vaughn, J. A. (NASA Marshall Space Flight Center Huntsville,AL United States)
Kamenetzky, R. R. (NASA Marshall Space Flight Center Huntsville,AL United States)
Finckenor, M. M. (NASA Marshall Space Flight Center Huntsville,AL United States)
Meshishnek, M. J. (Aerospace Corp. El Segundo, CA United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1996
Subject Category
Nonmetallic Materials
Report/Patent Number
NAS 1.15:108518
NASA-TM-108518
Accession Number
97N11712
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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