Optical properties and failure analysis of ZrC-ZrO x ceramic based spectrally selective solar absorbers deposited at a high substrate temperature

摘要

AbstractA tandem layer structured ZrC-ZrOx/Al2O3coatings are deposited onto stainless steel (SS) substrates by the sputtering method for solar selective absorbing. The ZrC-ZrOxand Al2O3layers work as an absorptance layer and an antireflectance layer, respectively. The substrate temperature has an important effect on the optical properties of the coating. With a high substrate temperature (300°C), the SS/ZrC-ZrOx/Al2O3coatings exhibit a relatively high absorptance of 0.92 and a relatively low emittance of 0.12. The composition, structure, optical properties and surface morphology of the coatings are characterized using SEM, EDS, XPS, Raman, UV–vis–NIR spectrophotometry and Fourier transform infrared spectroscopy. Detailed failure analysis of the SS/ZrC-ZrOx/Al2O3coatings in vacuum and air is conducted.Highlights?The SS/ZrC-ZrOx/Al2O3solar absorber c