Abstract
Solar selective tungsten–alumina cermets were deposited with a low-pressure cold-wall CVD-system utilising the simultaneous pyrolytical decomposition of tungstenhexacarbonyl and aluminiumtriisopropylate (ATI). The deposition results in amorphous W–WOx–Al2O3 films. After a post-deposition annealing in pure hydrogen at 800°C for a maximum of 1h the films consist of fine grained γ-alumina and metallic tungsten. The hemispheric reflectivity was measured from 0.2–25μm and compared to the emissivity, measured with a thermopile set-up. An absorptivity of 0.85 and an emissivity of 0.04 could be obtained for a single layer on copper substrates. Improvement of the absorption by a gradient of the tungsten content in the layer was investigated.
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