White paint, black paint, aluminized polyimide and silvered fluorinated ethyl propylene (FEP) were irradiated with electron beam (EB), H(+) and Fe(5+) to simulate 10 years in a geostationary orbit (GEO) environment, with atomic oxygen (AO) to simulate 1 year in a low Earth orbit (LEO) environment, and with UV to simulate 300 ESDs by utilizing ground simulation test facilities. Applied energies were 0.5 and 1.9 MeV for EB; 1,3 and 10 MeV for H(+); 15 MeV for Fe(5+); 5 eV for AO; and equal to or larger than 3.1 eV for UV. EB -> UV and EB -> AO irradiation was also applied to white paint and black paint. The samples were examined in view of thermo-optical properties. Mass loss values were evaluated for white paint and black paint. AO, UV, EB showed larger effects on the samples than ions (H(+) and Fe(5+)). The reason for smaller effects with ions compared with EB may come from a much lower fluence of ions (H(+): 2x 10(exp11) cmexp-2); Fe(5+): 5x10(exp9) cm(exp-2)) compared with, for example, EB (2 x 1016 cm-2). Absorbed doses, which are proportional to the product of stopping power and fluence, were significantly less for the ions than for the electrons. The variations in energy flux and fluence examined for EB, H(+) and Fe(5+) irradiation resulted in negligible changes in the thermo-optical properties under the conditions of the present work. This suggests that the acceleration tests using the ground simulation test facilities that adopt higher flux than the real space environment are valid for these irradiations with materials of the type studied herein. Compositional and morphological aspects of all the samples were detected with ESCA. FTIR and SEM.
Evaluation and analysis of thermal control materials under ground simulation test for space environment effects
2001
19 Seiten, 9 Bilder, 15 Tabellen, 21 Quellen
Aufsatz (Konferenz)
Englisch
Weltraum , Satellit , Farbechtheitsprüfung , Farbe , geostationärer Satellit , Elektronenstrahl , thermooptisches Messverfahren , Konzentrationseinfluss , morphologische Prüfung , ESCA-Spektroskopie , FT-IR-Spektroskopie , Rasterelektronenmikroskop , Zinkoxid , Silicium , Kohlenstoff , Urethan , Nickellegierung , Acrylharz , Verbundstoff , ultraviolette Strahlung , weiße Farbe , schwarze Farbe
Space simulation test for thermal control materials
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