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Microstructure and Wear Resistance of Plasma-Sprayed Molybdenum Coating Reinforced by MoSi2 Particles

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Mo coatings with or without incorporated MoSi2 were fabricated by atmospheric plasma spraying, and their microstructure, microhardness, bond strength, and wear resistance were compared. Two kinds of spray powder, i.e., pure Mo and a blend of Mo and MoSi2, were sprayed onto low-carbon steel. Microstructural analysis of the MoSi2-Mo coating showed MoSi2 homogeneously distributed in a Mo matrix. Addition of MoSi2 particles increased the microhardness of the as-sprayed Mo coating. The adhesion strength of the Mo coating was better than that of the MoSi2-Mo coating. Wear test results showed that the wear rate and friction coefficient of the two coatings increased with increasing load, and the friction coefficient of the MoSi2-Mo coating was lower than that of the Mo coating. The MoSi2-Mo composite coating exhibited better wear resistance than the Mo coating. The wear failure mechanisms of the two coatings were local plastic deformation, delamination, oxidation, and adhesion wear.

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Acknowledgments

This project was jointly supported by the National Natural Science Foundation of China (Grant No. 51475161), the Scientific Research Fund of Hunan Provincial Education Department (Grant No. 15A059), and the State Key Laboratory of Powder Metallurgy of Central South University.

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Authors and Affiliations

  1. Hunan Provincial Key Defense Laboratory of High Temperature Wear Resisting Materials and Preparation Technology, Hunan University of Science and Technology, Xiangtan, People’s Republic of China

    Jianhui Yan, Zheyu He, Yi Wang, Jingwen Qiu & Yueming Wang

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  1. Jianhui Yan
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  2. Zheyu He
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  3. Yi Wang
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  4. Jingwen Qiu
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  5. Yueming Wang
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Correspondence to Jianhui Yan.

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Yan, J., He, Z., Wang, Y. et al. Microstructure and Wear Resistance of Plasma-Sprayed Molybdenum Coating Reinforced by MoSi2 Particles. J Therm Spray Tech 25, 1322–1329 (2016). https://doi.org/10.1007/s11666-016-0440-6

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  • DOI: https://doi.org/10.1007/s11666-016-0440-6

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