Co-reporter:Dianqing Gong, Huidong Liu, Gan Luo, Pu Zhang, Xudong Cheng, Bing Yang, Yanbin Wang, Jie Min, Wenxian Wang, Shaoping Chen, Zeqin Cui, Li Kewei, Hu Lifang
Solar Energy Materials and Solar Cells 2015 Volume 136() pp:167-171
Publication Date(Web):May 2015
DOI:10.1016/j.solmat.2015.01.015
•AlCrNO-based solar selective absorbing coating is made by cathodic arc plating.•Absorptance/emittance of the coating is 0.93/0.20.•The coating was annealed at 500 °C for 100 h in the atmosphere.•After annealing, absorptance/emittance of the coating is 0.94/0.22.•The CrN content, the grain size, and the surface roughness were the factors which influenced the solar selective of the coating.A novel AlCrNO-based solar selective absorbing coating was prepared by cathodic arc plating. The coating exhibited excellent selective absorbing properties with an absorptance of 0.93 and an emittance of 0.20. To test the in air thermal stability of this coating, the sample was annealed at 500 °C for 100 h in air. Experimental results indicated that the coating was highly stable in air at 500 °C, as the absorptance/emittance of the coating kept almost unchanged (0.94/0.22) after 100 h annealing. The microstructure of the coating was investigated by scanning electron microscope (SEM), energy dispersive spectrometer (EDS), atomic force microscope (AFM), and X-ray diffraction (XRD).
Co-reporter:Ya Gao, Jiangtao Xiong, Dianqing Gong, Jinglong Li, Min Ding
Vacuum 2015 Volume 121() pp:64-69
Publication Date(Web):November 2015
DOI:10.1016/j.vacuum.2015.07.018
•Laser treatment was used to improve the solar absorbing property of HVOF sprayed Ni–Mo based coatings.•The solar absorptance (α) was improved from 0.75 to 0.83 for Ni–Mo–Co sample, and from 0.84 to 0.88 for Ni–Mo sample.•The enhanced α was attributed to multiple changes in microstructure.•After laser treatment, phase contents were redistributed, micro-defects were reduced and surface roughness was improved.Ni–Mo and Ni–Mo–Co high velocity oxy-fuel (HVOF) sprayed coatings were treated by Nd:YAG laser source, for the purpose of improving the solar absorbing effect. The coatings after laser treatment showed increment on solar absorptance (α) as the Ni–Mo sample increased from 0.84 to 0.88 and Ni–Mo–Co sample from 0.75 to 0.83. To elucidate the mechanisms for the improvement, microstructures of the coatings before and after laser treatment were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and laser scanning confocal microscope (LSCM). The results demonstrated that the enhanced α was attributed to multiple mechanisms including the decrease in nickel oxide content, the increase in metallic volume fraction, the reduction of micro-defects as well as the greater surface roughness.
