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TEM Studies of Protective Al Coatings on Kapton H

  • Judith C. Yang (a1), Huiping Xu (a1), Long Li (a1), Deborah Waters (a2) and Bruce Banks (a2)...

Abstract

Polymeric materials undergo rapid erosion when exposed to the harsh low-earth-orbit (LEO) environment. Coatings can reduce the erosion rate of polyimide Kapton from atomic oxygen (AO) attack. Specifically, we are investigating how thin Al coatings can protect Kapton. Protective Al layers with variations in layer thickness and growth conditions were deposited on Kapton H. The quality of these protective coatings were evaluated by mass loss measurement and compared to Kapton alone and the SiO2 coating, where dramatically decreased erosion rate was noted. To understand how these coatings protect Kapton as well as how the AO interacts with the coatings, we are investigating the microstructure of these coated materials by plane view and cross-sectional transmission electron microscopy (TEM) methods. To understand the AO degradation mechanism, we attempted to correlate the mass loss with growth conditions and microstructures. We noted a slight improvement in erosion resistance of the Al coating due to the presence of the dendrimer, but a major improvement when the Al coating is deposited under ultrahigh vacuum conditions.

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References

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5. Forkapa, M.J, Banks, B.A, Rutledge, S.K, Stidham, C.R, Ma, D., and Sechkar, E., “Atomic Oxygen Durability Testing of an International Space Station Solar Array Validation Coupon, presented at the Third International Space Conference, Toronto, Canada, April 25.26, 1996.
6. Snyder, A. and deGroh, K.K., “The Dependence of Atomic Oxygen Undercutting of Protected Polyimide Kapton H Upon Defect Size,” presented at the 8th International Symposium on Materials in a Space Environments and the Fifth International Conference on Protection of Materials and Structures for LEO Space Environment, Arcachon, France, and June 5–9, 2000.
7. Xu, F., Li, L., Yang, J. C., Street, S. C., Barnard*, J. A., Microsc. Microanal. 8 (Suppl. 2), 1120 (2002).
8. Smallman, R.E., Modern Physical Metallurgy, fourth ed. (Butterworth & Co (Publishers) Ltd, London, 1985) pp. 146–8.

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