Influence of a ground-simulated space environment on a solid lubricant was compared to that of the real space environment The tested lubricant that lias been used for space applications was a bonded MoS2 film with organic binder. The film was irradiated individually with atomic oxygen (AO), ultraviolet rays (UV), and electron beam (EB). The fluencies of these space environment factors corresponded to exposure to the LEO environment around tlte International Space Station (ISS) in the Space Environment Exposure Device (SEED) experiment to about 1,2, and 3 years. Friction tests in vacuum and surface analyses were carried out for tlie samples. Tribological behaviour of the different samples was measured using a classical reciprocating pin-on-flat friction test. Furthermore, XPS analysis of the film surface and the rubbing tracks was performed on the samples. Results show that due to AO irradiation, the friction coefficient decreased at an early stage of the tests that was similar to the results obtained on film exposed to the real LEO environment. However, no significant difference was observed with difference in AO fluence, whereas the friction coefficient of flight samples decreased concomitantly with the duration of exposure to the LEO environment.
Tribological characteristics of bonded MoS2 film exposed to AO, UV and real LEO environment in SM/SEED experiment
Tribologische Eigenschaften des gebundenen MoS2-Films, der dem atomaren Sauerstoff, der Ultraviolettbestrahlung und dem realen LEO-Weltraum im SM/SEED-Experiment ausgesetzt wurde
2008
6 Seiten, 7 Bilder, 1 Tabelle, 21 Quellen
Aufsatz (Konferenz)
Englisch
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