Structure, optical properties and thermal stability of Al2O3-WC nanocomposite ceramic spectrally selective solar absorbers

Traditional metal-dielectric composite coating has found important application in spectrally selective solar absorbers. However, fine metal particles can easily diffuse, congregate, or be oxidized at high temperature, which causes deterioration in the optical properties. In this work, we report a ne...

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Bibliographic Details
Published in:Optical materials 2016-08, Vol.58, p.219-225
Main Authors: Gao, Xiang-Hu, Wang, Cheng-Bing, Guo, Zhi-Ming, Geng, Qing-Fen, Theiss, Wolfgang, Liu, Gang
Format: Article
Language:English
Subjects:
Nanocomposite ceramic
Optical properties
Solar absorber
Structure
Thermal stability
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Summary:Traditional metal-dielectric composite coating has found important application in spectrally selective solar absorbers. However, fine metal particles can easily diffuse, congregate, or be oxidized at high temperature, which causes deterioration in the optical properties. In this work, we report a new spectrally selective solar absorber coating, composed of low Al2O3 ceramic volume fraction (Al2O3(L)-WC) layer, high Al2O3 ceramic volume fraction (Al2O3(H)-WC layer) and Al2O3 antireflection layer. The features of our work are: 1) compared with the metal-dielectric composites concept, Al2O3-WC nanocomposite ceramic successfully achieves the all-ceramic concept, which exhibits a high solar absorptance of 0.94 and a low thermal emittance of 0.08, 2) Al2O3 and WC act as filler material and host material, respectively, which are different from traditional concept, 3) Al2O3-WC nanocomposite ceramic solar absorber coating exhibits good thermal stability at 600 °C. In addition, the solar absorber coating is successfully modelled by a commercial optical simulation programme, the result of which agrees with the experimental results. [Display omitted] •Al2O3-WC nanocomposite ceramic solar absorber coating is successfully fabricated.•The nanocomposite ceramic solar absorber coating exhibits a high absorptance of 0.94 and a low emittance of 0.08.•The nanocomposite ceramic solar absorber coating exhibits a good thermal stability at 600 °C.•The reflectance spectra is successfully modelled by a commercial optical programme.
ISSN:0925-3467
1873-1252
DOI:10.1016/j.optmat.2016.05.037