期刊
SOLAR ENERGY
卷 227, 期 -, 页码 457-467出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2021.09.026
关键词
Durability; Thermal shock; Thermal stability; Optical properties; Solar accelerated ageing; Environmental stability
资金
- Centre Franco-Indien pour la Promotion de la Recherche Avancee, CEFIPRA [U-1-154]
- Investments for the Future program of the French National Agency for Research [ANR-10-LABX-22-01-SOLSTICE, ANR-10-EQPX-49-SOCRATE]
- French Region Occitanie
- European Regional Development Fund FEDER (Vadum-CSP project)
- European Union Horizon H2020 Research and Innovation Programme through SFERA III Project [823802]
- CSIR
The study presents a solar selective coating fabricated using a specific sputtering system, demonstrating high thermal stability, superior mechanical properties, and excellent resistance to ageing. Results from various tests under different conditions indicate that the coating exhibits high thermophysical resistance and stable optical performance.
We report a solar selective coating of W/WAlSiN/SiON/SiO2 fabricated using a Four-Cathode Reactive Unbalanced Direct Current (DC) magnetron sputtering system with high thermal stability, good durability and resistance to outdoor testing conditions. The coating also exhibits superior mechanical properties (Hardness similar to 12 GPa). In addition, thermal shock tests at high temperatures and solar accelerated ageing measurements are investigated in-depth to analyze the performance of the solar absorber coating. The thermal shock tests of the samples at various temperatures in the range of 500-600 degrees C depict the excellent thermophysical resistance of the as-deposited samples. To test the thermal durability of the solar absorber coating, we applied 200 cycles of solar accelerated ageing on the samples using a solar accelerated ageing facility with concentrated flux density varying from 50 to 250 kW/m(2). These cycles have been defined to replicate real high solar flux and temperature on the front side of the samples along with high cooling and heating rates, reproducing the abrupt variations of solar irradiation due to cloudy weather and subsequent thermal shocks for a given receiver. Overall, the durability tests of the solar absorber carried out under various conditions indicate a minimal change in the optical properties (Delta alpha = 0.002 and Delta epsilon = 0), thus, making it a potential candidate for high-temperature solar thermal applications.
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