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Microstructure Evolution of Plasma-Sprayed MoSi2 Coating at RT-1200 °C in Air

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Abstract

In this work, the phase composition and microstructure evolution of vacuum plasma-sprayed MoSi2 coating between room temperature and 1200 °C in air was evaluated and characterized. The results showed that hexagonal MoSi2 (h-MoSi2) became the main phase in the deposited coating, which remained even after 50 h oxidation at 500 °C, exhibiting excellent thermal stability. MoO3 bundles and SiO2 clusters were generated by consuming tetragonal MoSi2 (t-MoSi2) after 1 h, and white powders formed on the coating’s surface after 10-h exposure to air at 500 °C. Most h-MoSi2 transformed to t-MoSi2 at 800 °C; moreover, a protective silica layer formed on the coating surface. Similar phenomenon was observed for the coating exposed to 1000 °C where grain growth also occurred. Vacuum heat treatment at 900 °C effectively improved the thermal stability of the MoSi2 coating. The formation of silica layer alleviated negative effects of structural defects and helped the MoSi2 coating serve as a protective coating for varied substrates.

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Acknowledgments

This work was supported by the National Natural Science Foundation (for Young Scholar) of China under Grant 51102267, Engineering case study in extreme conditions using system mechanics approach (XDB22010202) and Youth Innovation Promotion Association CAS (2014223). Guocheng Wang wants to thank the Shenzhen Peacock Innovation Team (110811003586331) and Shenzhen Key Laboratory of Marine Biomedical Materials (ZDSY20130401165820356) for their support.

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Authors and Affiliations

  1. Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China

    Yaran Niu, Cuihong Zhai, Liping Huang, Xuebin Zheng & Chuanxian Ding

  2. Research Center for Human Tissues and Organs Degeneration, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, 518055, Guangdong, China

    Guocheng Wang

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  1. Yaran Niu
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Correspondence to Yaran Niu or Xuebin Zheng.

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Niu, Y., Zhai, C., Wang, G. et al. Microstructure Evolution of Plasma-Sprayed MoSi2 Coating at RT-1200 °C in Air. J Therm Spray Tech 27, 938–948 (2018). https://doi.org/10.1007/s11666-018-0730-2

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