Computer Science
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.540..325s&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, Ground Testing
Scientific paper
Most facilities for testing of spacecraft materials on their stability to attack by fast atomic oxygen (AO) are based on the generation of hypersonic beams of AO in nozzle sources with the use of continuous electrical discharges or in laser pulse induced breakdown of the gaseous oxygen. In both cases, the sources of fast AO are simultaneously the rather intense sources of vacuum ultraviolet (VUV) radiation. Here we have measured directly the intensity of VUV radiation from fast AO source in CAHI facility VAT-102. This VUV radiation can take part in destruction and erosion of polymer materials simulating the oxydative effects of fast AO. Its contribution to observed mass losses is greatly depending on the material to be tested. For polymers consisted of carbon, hydrogen, oxygen and nitrogen the main role in erosion is played by fast AO. The decisive role of VUV radiation is shown in erosion of fully fluorinated polymers. The mass losses of Teflon and Teflon FEP films in facilities for generation of fast AO are proposed as the measure of VUV radiation dose in these facilities. The main features of mass losses in dependence on time of VUV irradiation are formulated.
Nikiforov A. P.
Samsonov V. P.
Skurat V. E.
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