Improvement of solar absorbing property of Ni–Mo based thermal spray coatings by laser surface treatment》.pdf

Vacuum 121 (2015) 64e69 Contents lists available at ScienceDirect Vacuum journal homepage: /locate/vacuum Improvement of solar absorbing property of NieMo based thermal spray coatings by laser surface treatment Ya Gao a, Jiangtao Xiong b, Dianqing Gong c, *, Jinglong Li a, Min Ding c a Shaanxi Key Laboratory of Friction Welding Technologies, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi an 710072, Shaanxi, PR China b State Key Laboratory of Solidifi cation Processing, Northwestern Polytechnical University, Xian 710072, Shaanxi, PR China c Key Laboratory of Interface Science and Engineering in Advanced Materials (Ministry of Education), College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, PR China a r t i c l e i n f o a b s t r a c t Article history: NieMo and NieMoeCo high velocity oxy-fuel (HVOF) sprayed coatings were treated by Nd:YAG laser Received 26 May 2015 source, for the purpose of improving the solar absorbing effect. The coatings after laser treatment Received in revised form showed increment on solar absorptance (a) as the NieMo sample increased from 0.84 to 0.88 and NieMo 25 July 2015 eCo sample from 0.75 to 0.83. To elucidate the mechanisms for the improvement, microstructures of the Accepted 25 July 2015 coatings before and after laser treatment were investigated by X-ray diffraction (XRD), scanning electron