Development of a white oxide-plasmic coating with improved thermo-optical properties for space applications
Résumé
The optical and electrical properties of aluminum oxide layers formed by Micro-Arc Oxidation (MAO) process for potential application in spacecrafts have been investigated. The operational conditions of the MAO process have been correlated to the structural features of the coatings and to the optical properties. Results show that, although environnement tests (UV, particles and thermal cycling) remain to be done, by selecting appropriate electrolyte formulation, the measured thermo-optical parameters could fit the specification range of cold coatings. Furthermore, the electrical properties of such coatings have been investigated by means of surface and volume conductivity measurements as well as dielectric spectroscopy. Results highlight that materials exhibiting the best thermo-optical properties are those having the higher electrical conductivity, with values appearing favorable regarding the targeted application.
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