Wide temperature range and abrasion-resistant anticorrosion of Y2O3-doped cermet-based single-layer nano-composite solar spectrum selective absorbing coating by laser cladding

Due to long-term exposure to high temperatures, it is critical to developing solar selective absorption coating with excellent weather resistance and thermal stability. In this paper, the TiN/TiC–Ni/Mo–Y 2 O 3 cermet-based single-layer nano-composite solar spectrum selective absorption coatings were prepared on the 316L stainless steel matrix by laser cladding. The optimal process parameters ( P = 1000 W, D = 3 mm, and V = 3 mm/s) of laser cladding were selected by combining the experiments and the temperature field simulation of the coating. The results show that the coating with 3 wt.% Y 2 O 3 addition exhibits the best optical performance, i.e., the absorptivity α is 90.0%, the emissivity ε is 2.8% and the photothermal conversion efficiency η is 85.9%. After heat treatment at 800 °C for 24 h, the absorptivity and emissivity of the coating retain 81.0% and 2.9%, respectively, which is better than most single-layer solar selective absorption coating. Moreover, compared to the 316L stainless steel matrix, the self-corrosion potential of coating is increased by 34.7%, and the steady-state average friction coefficient of coating is reduced by 28.6%, indicating its corrosion resistance and wear resistance are significantly improved. In addition, the hardness of the coating is 1.75 times that of the matrix. Hence, the modification of cermet-based coatings by rare earth oxides provides a way for the development of solar selective absorption coatings with exceptional optical properties as well as hard protective characteristics at high temperatures.