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5136 |
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Effect of Mo content on tribological properties of plasma sprayed NiCrBSi-Mo composite coatings |
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Chao Zhang / Yangzhou University, China Haifeng Xu/ Yangzhou University, China Jinkun Xiao/ Yangzhou University, China Liming Xu/ Yangzhou University, China Hanlin Liao*/ University Bourgogne Franche-Comté, France |
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NiCrBSi is a widely used thermal spray material. In low-load sliding condition, NiCrBSi has a good friction and wear performance, whereas in the high load sliding condition, NiCrBSi surface deformes, with the increase of stress and wear loss. In order to improve the tribological properties of plasma sprayed NiCrBSi coatings, we added Mo to the coating to reduce the friction coefficient and improve the wear resistance of the coatings. In this study, Mo was mixed in NiCrBSi powder with 5%, 10%, 20% and 30% in mass fraction. Atmospheric plasma spray is used to deposit on the surface of the stainless steel specimens, and the coating thickness is controlled at 200-300 microns. Using X - ray diffraction, optical microscope and scanning electron microscope, the phase structure of coating and the morphology of polished section were analyzed. The friction coefficient was measured by UMT-2 tribotester, and the wear rate was measured by 3D optical microscope. It was found that the Mo can improve the coating microstructure of hard phase and reduce line expansion coefficient. In addition, Mo as a film covering on the top surface of the coating, can effectively reduce the NiCrBSi coating. |