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Comparison of Hyperthermal Ground Laboratory Atomic Oxygen Erosion Yields With Those in Low Earth OrbitThe atomic oxygen erosion yields of 26 materials (all polymers except for pyrolytic graphite) were measured in two directed hyperthermal radio frequency (RF) plasma ashers operating at 30 or 35 kHz with air. The hyperthermal asher results were compared with thermal energy asher results and low Earth orbital (LEO) results from the Materials International Space Station Experiment 2 and 7 (MISSE 2 and 7) flight experiments. The hyperthermal testing was conducted to a significant portion of the atomic oxygen fluence similar polymers were exposed to during the MISSE 2 and 7 missions. Comparison of the hyperthermal asher prediction of LEO erosion yields with thermal energy asher erosion yields indicates that except for the fluorocarbon polymers of PTFE and FEP, the hyperthermal energy ashers are a much more reliable predictor of LEO erosion yield than thermal energy asher testing, by a factor of four.
Document ID
20140011471
Document Type
Technical Memorandum (TM)
Authors
Banks, Bruce A. (Science Applications International Corp. Cleveland, OH, United States)
Dill, Grace C. (Alphaport, Inc. Cleveland, OH, United States)
Loftus, Ryan J. (Alphaport, Inc. Cleveland, OH, United States)
deGroh, Kim K. (NASA Glenn Research Center Cleveland, OH, United States)
Miller, Sharon K. (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
September 9, 2014
Publication Date
December 1, 2013
Subject Category
Chemistry and Materials (General)
Report/Patent Number
GRC-E-DAA-TN10447
NASA/TM-2013-216613
E-18806
Funding Number(s)
CONTRACT_GRANT: NNC12BA01B
WBS: WBS 468606.05.05.03
CONTRACT_GRANT: NNC09BA03B
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Flight tests
polymers
durability
oxygen atoms
Earth orbital environments
Ground tests

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