Computer Science
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.540..527f&link_type=abstract
In: Proceedings of the 9th International Symposium on Materials in a Space Environment, 16-20 June 2003, Noordwijk, The Netherla
Computer Science
Space Environment, Materials
Scientific paper
The impact of molecular deposits from spacecraft materials outgassing is not only dependent on sensitive surface nature and contaminant type but also on space environment parameters. In order to study the combined effects of contamination and solar radiation, ground tests have been performed on thermal control coatings: innovative ones such as Flexible and Rigid Solar Reflectors (FSR and RSR), and classic ones such as Optical Solar Reflectors (OSR) and Second Surface Mirrors (SSM). During a first phase, samples of these cold coatings have been exposed to an outgassing flux of different widely used materials: - a PU1 black paint, - a conformal coating MAPSIL 213B, - a structural adhesive Scotchweld EC2216 and to an outgassing flux coming from the mixture of these three materials. During a second phase, the samples have been exposed through two successive tests (either under UV or protons) to a simulated space environment corresponding to one year satellite GEO orbit on North / South faces. Material degradation has been evaluated by in-situ reflectance spectra in the range 250-2500 nm (UV test) and in the range 250-840 nm (Protons test). Negligible changes occurred during initial air to vacuum transition whereas significant recoveries of degradations occurred when returning to ambient atmospheric pressure. The observed degradation is the most important in the UV-visible range independently of the contaminants and substrates. It is partly due to contaminants and substrates for silicone cold coatings FSRs, RSRs, mainly due to contaminants for OSRs, SSMs and mainly due to substrates in the case of paints.
Faye Delphine
Marco Jordi
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