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Study on Microstructure and Wear-resistant Properties of WC/SS316L Composite Coatings Prepared by Supersonic Laser Deposition

Li Bo;Li Penghui;Zhang Qunli;Chen Zhijun;Dong Gang;Yao Jianhua;Collabrative Innovation Center of High-end Laser Manufacturing Equipment,Zhejiang Province,Institute of Advanced Laser Manufacturing,Zhejiang University of Technology;  
WC/SS316 L composite coatings were deposited onto carbon steel substrate by supersonic laser deposition(SLD) and cold spray(CS) respectively. The microstructure,composition and wear-resistant properties of the as-deposited coatings were comparatively studied with optical microscopy,scanning electron microscopy,energy dispersive spectrometer and wear tester. The results show that deposition efficiency and WC concentration of the SLD specimen(800 ℃) are improved by 43 % and30 % respectively as compared with those of the CS sample. The coating density of the SLD sample is also superior to that of the CS sample. Moreover,the friction coefficient of the SLD specimen is 19 %lower than that of the CS specimen,thus exhibiting better wear-resistant properties.
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