Abstract
Spectral selective materials have attracted an increasing interest because of Concentration Solar Power Plant. Those materials are expected to exhibit specific optical properties at temperatures higher than 450 °C. Plasma-spraying process is commonly used to manufacture high-temperature coatings. In this study, heterogeneous coatings made of aluminum and alumina were produced by spraying both powder and suspension of boehmite clusters. Both optical and electrical properties were measured because, according to the Hagen-Ruben’s law, the higher the resistivity the lower the reflectivity. The reflectivity was assessed by spectrometry at 10 µm and the resistivity by the four-points technique. The results were combined with the diameter of flattened lamellae and the volume fraction of alumina in the coatings. Then the highest reflectivity is achieved with a metallic coating exhibiting high flattening degree, while the coatings containing a large amount of alumina exhibit the lowest reflectivity and the highest resistivity.
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This article is an invited paper based on an oral presentation at the Fifth International Workshop on Suspension and Solution Thermal Spraying (S2TS) 2011. This workshop was held in Tours, France, October 3-4, 2011 and was organized by CEA Le Ripault.
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Brousse-Pereira, E., Wittmann-Teneze, K., Bianchi, V. et al. Optical and Electrical Properties of Heterogeneous Coatings Produced by Aluminum Powder and Boehmite Suspension Plasma Spraying. J Therm Spray Tech 21, 1110–1119 (2012). https://doi.org/10.1007/s11666-012-9792-8
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DOI: https://doi.org/10.1007/s11666-012-9792-8