Other
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.540..415t&link_type=abstract
In: Proceedings of the 9th International Symposium on Materials in a Space Environment, 16-20 June 2003, Noordwijk, The Netherla
Other
Space Environment, Materials, Radiation, Flight
Scientific paper
Some commonly used spatial industry materials were studied in order to understand their ageing in GEO environment. Among these materials, a white commercial paint was the subject of several analyses. The material was submitted to proton irradiation with a total dose equivalent at the surface to 20 years in geostationary orbit. Several testing methods were used to characterize materials: reflectance measurements, SEM and optical observations, AC impedance and direct conductivity measurements. The first observation was a yellowing of the white paint after irradiation. This is confirmed by binocular and SEM observations with the apparition of a contrast between the non irradiated and the irradiated part of the same sample. Moreover, reflectance spectra reveal the presence of two absorption bands, one around 500 nm, coherent with the yellowing of the material, and the second one in the near infrared. Absorptivity calculations verify this tendency with Δαs = +0.4 at the end of the test. On another hand, by comparing AC impedance and DC conductivity measurements, it was evidenced that conductivity of the paint is decreasing after irradiation. This result is obtained by measuring the sample at ambient temperature. The effect of the temperature on the conductivity of the material was studied, and it was shown that for T > 100°C, the irradiated paint was more conductive than the non irradiated one.
Duvignacq Carole
Lavielle Denis
Le Guevel Marie
Tonon Claire
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