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Self-lubricating Wear Resistant Composite Coating Ti-Ni+TiN+MoS2/TiS Prepared on Ti-6Al-4V Alloy by Laser Cladding |
Qiushi GAO1,2, Hua YAN1,2(), Yang QIN1,2, Peilei ZHANG1,2, Zhengfei CHEN1,2, Jialong GUO1,2, Zhishui YU1,2 |
1 Shanghai University of Engineering Science, College of Materials Engineering, Shanghai 201620, China 2 Shanghai Collaboratme Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201620, China |
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Cite this article:
Qiushi GAO, Hua YAN, Yang QIN, Peilei ZHANG, Zhengfei CHEN, Jialong GUO, Zhishui YU. Self-lubricating Wear Resistant Composite Coating Ti-Ni+TiN+MoS2/TiS Prepared on Ti-6Al-4V Alloy by Laser Cladding. Chinese Journal of Materials Research, 2018, 32(12): 921-928.
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Abstract A self-lubricating composite coating of Ti-Ni+TiN+MoS2/TiS with TiN, TiMo and Ti2Ni as reinforcement phases, while MoS2 and TiS as lubricant phases, was fabricated on Ti-6Al-4V alloy by laser cladding with composite alloy powder of NiCrBSi, TiN and Ni-coated MoS2 as cladding materials. The phase compositions, microstructure, microhardness and tribological properties of the coating were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), microhardness tester and multi-purpose friction and wear testing machine,respectively. Results show that the mean microhardness of the composite coating (between 1060 and 1140HV0.3) is about 3 times higher than that of the substrate (370HV0.3). Due to the combined effect of hard reinforcing phases TiN, TiMo, and Ti-Ni, as well as lubricating phases MoS2 and TiS, the friction coefficient (0.3199) and the wear mass loss (2.2 mg) of the composite coating are both lower than those of the substrate (0.3535 and 11.8 mg). Therefore, the prepared composite coating has good self-lubricating wear resistance.
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Received: 09 February 2018
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Fund: Supported by National Natural Science Foundation of China (Nos. 51405288 & 51605276), Technology Innovation Action Plan Project of Shanghai (Nos. 17JC1400600 & 17JC1400601), Graduate Student Innovation Project of Shanghai University of Engineering Science (No. 17KY0503) |
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