Abstract
In this study, the spectrally selective solar absorber coatings of TiN/Al2O3 are deposited onto stainless steels (SS) at a high substrate temperature of 300°C, which exhibits a high absorptance of 0.92 and a low emittance of 0.11 at 82°C. The structure, optical properties and thermal stability have been characterized by ultra-high resolution scanning electron microscopy, UV–vis–NIR spectrophotometry, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The study's results indicate that the substrate temperature (300°C) has an important effect on the solar absorptance and emittance. The SS/TiN/Al2O3 coating exhibits good thermal stability in a vacuum at 500°C for 5h. The coating also exhibits good thermal stability in air at 200°C for 2h. Raman analysis confirms that the oxidation of the SS/TiN/Al2O3 coating in air causes the composition to approach the stable oxide TiO2.
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