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Leveling coatings for reducing the atomic oxygen defect density in protected graphite fiber epoxy compositesPinholes or other defect sites in a protective oxide coating provide pathways for atomic oxygen in low Earth orbit to reach underlying material. One concept of enhancing the lifetime of materials in low Earth orbit is to apply a leveling coating to the material prior to applying any reflective and protective coatings. Using a surface tension leveling coating concept, a low viscosity epoxy was applied to the surface of several composite coupons. A protective layer of 1000 A of SiO2 was deposited on top of the leveling coating, and the coupons were exposed to an atomic oxygen environment in a plasma asher. Pinhole populations per unit area were estimated by counting the number of undercut sites observed by scanning electron microscopy. Defect density values of 180,000 defects/sq cm were reduced to about 1000 defects/sq cm as a result of the applied leveling coating. These improvements occur at a mass penalty of about 2.5 mg/sq cm.
Document ID
19930006408
Document Type
Conference Paper
Authors
Jaworske, D. A. (NASA Lewis Research Center Cleveland, OH, United States)
Degroh, Kim K. (NASA Lewis Research Center Cleveland, OH, United States)
Podojil, G. (Cleveland State Univ. OH., United States)
Mccollum, T. (Cleveland State Univ. OH., United States)
Anzic, J. (Cleveland State Univ. OH., United States)
Date Acquired
September 6, 2013
Publication Date
November 1, 1992
Publication Information
Publication: NASA. Goddard Space Flight Center, The Seventeenth Space Simulation Conference. Terrestrial Test for Space Success
Subject Category
SPACECRAFT DESIGN, TESTING AND PERFORMANCE
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19930006404Analytic PrimaryThe Seventeenth Space Simulation Conference. Terrestrial Test for Space Success