태양 선택흡수막의 특성 분석

Abstract

The chemical composition of the black Cr solar selective coatings electrodeposited were investigated for property analysis by using a XPS (X-ray photoelectron spectroscopy) before and after annealing in air at 300 0C 500 0C for 120 hours. Black Cr selective coating exposed by solar radiation for 5 months was compared with annealed sample. In addition, The Cu solar selective coatings were prepared by thermal oxidation method for low temperature application. The samples obtained were characterized by using the optical reflectance measurements by using a spectrometer. Optical properties of oxidized Cu solar coatings were solar absorptance ()0.62 and thermal emittance ()0.41 (100 0C). In the as-prepared Cr black selective coating, the surface of the coating was found to have Cr hydroxide and Cr. The Cr hydroxide of the major component was converted to Cr2O3 or CrO3 form after annealing at 500 0C with the desorption of water molecules. The black Cr selective coating was degraded significantly at temperature of 500 0C. The main optical degradation modes of this coating were diffusion of Cu substrate materials.