Journal of Inorganic Materials ›› 2019, Vol. 34 ›› Issue (6): 646-652.DOI: 10.15541/jim20180394

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Microstructure and Property of MoSi2-30Al2O3 Electrothermal Coating Prepared by Atmospheric Plasma Spraying

Yan-Zhe ZHOU1,2,Min LIU2(),Kun YANG2,Wei ZENG2,Jin-Bing SONG2,Chun-Ming DENG2,Chang-Guang DENG2   

  1. 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China
    2. The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510650, China
  • Received:2018-09-03 Revised:2018-10-31 Published:2019-06-20 Online:2019-05-23
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  • Supported by:
    Pearl River S&T Nova Program of Guangzhou(201710010130);GDAS’ Project of Science and Technology Development(2017GDASCX-0111);Science and Technology Planning Project of Guangdong Province, China(2017A070701027);Science and Technology Program of Guangzhou(2014B070705007)

Abstract:

With MoSi2-30Al2O3 mixed powders as the raw material, MoSi2-30Al2O3 electrothermal coating was sprayed by atmospheric plasma spraying technology. The phase composition, microstructure and thermal stability of the coating were systematically studied by XRD, SEM, electrical test and differential thermal gravity analysis. The results show that MoSi2-30Al2O3 electrothermal coating shows dense microstructure. Al2O3 can improve the electrical resistivity and oxidation resistance of MoSi2 materials in low temperature. The coating exhibits an excellent electrical-heating performance. In the heating cycle test, it could be heated to 320 ℃ stably and exhibit uniform thermal distribution in the surface area. The temperature variation in roll’s central area can be controlled within 25 ℃; Oxidation and thermal stress relaxation during heating cycle would generate cracks and pores in the coating which would increase electrical resistivity.

Key words: electrothermal material, MoSi2-Al2O3 composite coating, atmospheric plasma spraying, electrical- heating performance

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