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Receiver Tube – The coating |
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The surface coating deposited on the tube is constituted of a thin film multilayer structure including an inferior layer of metal, reflecting in the infrared, and a superior layer of antireflective ceramic material. |
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A graded ceramic-metallic material (CERMET) having different volumetric fraction of metal is interposed between the two films. Thanks to this spectrally selective coating, the receiver tubes have
1) an absorbance higher than or equal to 95%
2) a design emissivity of lower than 10% at 400°C
3) a design emissivity of lower than 15% at 580°C |
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