Structure, optical properties and thermal stability of Al2O3-WC nanocomposite ceramic spectrally selective solar absorbers
| Autor: | Qingfen Geng, Zhi-Ming Guo, Xiang-Hu Gao, Cheng-Bing Wang, Gang Liu, Wolfgang Theiss |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Inorganic Chemistry Metal Coating Thermal emittance Thermal stability Ceramic Electrical and Electronic Engineering Physical and Theoretical Chemistry Composite material Spectroscopy Nanocomposite Organic Chemistry 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials visual_art Volume fraction engineering visual_art.visual_art_medium 0210 nano-technology Layer (electronics) |
| Zdroj: | Optical Materials. 58:219-225 |
| ISSN: | 0925-3467 |
| DOI: | 10.1016/j.optmat.2016.05.037 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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