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Effect of Nano-ZrO2 on the Microstructure and High Temperature Tribological Properties of MoSi2 Coating

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Abstract

Molybdenum disilicide (MoSi2)-based composite coating using nano-ZrO2 as an additive was deposited on a nickel-based alloy by air plasma spraying, and the phase composition and microstructure of the composite coating were characterized by x-ray diffraction (XRD) and scanning electron microscope. The high-temperature abrasive wear properties of the ZrO2-MoSi2 composite coating were compared with the pure MoSi2 coating at 1100 °C. The XRD results show that there exists mutual transformation between T-MoSi2 and H-MoSi2 phase and part of Mo-rich phases are formed because of oxidization during the spraying processing. The addition of nano-ZrO2 could improve the adhesion between the splats, prevent cracking along the interface between the splats, and purify the boundaries. The ZrO2-MoSi2 composite coating exhibits improved wear resistance compared with the pure MoSi2 coating. The addition of nano-ZrO2 could effectively mitigate the adhesion wear and brittle delamination of the MoSi2 coating.

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Acknowledgments

This project was jointly supported by the National Natural Science Foundation of China (Grant No. 51241010), the Natural Science Foundation of Hunan Provincial (Grant No. 11JJ3063), Hunan Provincial and Xiangtan City Natural Science Foundation of China (Grant No. 12JJ9011), the Scientific Research Fund of Hunan Provincial Education Department (Grant No. 11B047), and the research fund of Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province (Grant No. AE201108).

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  1. Hunan University of Science and Technology, Xiangtan, People’s Republic of China

    Jianhui Yan, Zhi Zhang, Longfei Liu, Hongmei Xu & Zhengyu Mao

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  1. Jianhui Yan
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  2. Zhi Zhang
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  3. Longfei Liu
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  4. Hongmei Xu
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  5. Zhengyu Mao
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Correspondence to Jianhui Yan.

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Yan, J., Zhang, Z., Liu, L. et al. Effect of Nano-ZrO2 on the Microstructure and High Temperature Tribological Properties of MoSi2 Coating. J Therm Spray Tech 22, 873–881 (2013). https://doi.org/10.1007/s11666-013-9924-9

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  • DOI: https://doi.org/10.1007/s11666-013-9924-9

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