Preparation and thermal stability on non-vacuum high temperature solar selective absorbing coatings

Spectrally selective TiAl/TiAlN/TiAlON/TiAlO coating was deposited on stainless steel and copper substrates using a multi-arc ion plating system. The structure, morphology, optical reflectance and electrical resistivity were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), spectrophotometer and four-point probe meter, respectively. The results show that the coating exhibits high absorptance (−0.9) and low emittance (0.09–0.19). The coating remains stable in air up to 650°C for 1h. These properties are of extraordinary interest in solar thermal power generations and energy saving buildings. Supported by the Technology Innovation Foundation of General Research Institute for Nonferrous Metals (Grant No. 52201)