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Preparation and Microstructure Characterization of Mullite Coatings Made of Mullitized Natural Andalusite Powders

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Abstract

Natural andalusite powders were heated at high temperature in air allowing mullitization. The mullitized powders were spray-dried and then air plasma sprayed to form mullite coatings. Microstructure and phase composition of the plasma-sprayed mullite coatings were investigated by means of scanning electron microscopy and x-ray diffraction. The effect of spraying power on the microstructure and phase composition of the mullite coatings was investigated. It has been found that spraying power has significant effect on the content of amorphous phase in the mullite coatings. At the same time, good adhesion is reached between the mullite coating and the bound coating (NiCrAlY) and between the bound coating and the substrate. The mullite coating deposited at a spraying power of 22.5 kW is free of cracks. The processes reported here are applicable to preparing mullite coatings used in high-temperature environment.

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Acknowledgments

This research is financially supported by the National Natural Science Foundation of China (Grant No. 50421502) and the Ministry of Science and Technology of China (project of “973” Plan; grant No. 2007CB607601). The authors appreciate the helpful comments of the reviewers.

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Authors and Affiliations

  1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China

    Yulong An, Guang Liu, Xiaoqin Zhao, Jianmin Chen, Huidi Zhou & Guoliang Hou

  2. Graduate School, Chinese Academy of Sciences, Beijing, 100049, China

    Yulong An, Guang Liu & Guoliang Hou

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  1. Yulong An
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  2. Guang Liu
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  3. Xiaoqin Zhao
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  4. Jianmin Chen
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Correspondence to Jianmin Chen.

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An, Y., Liu, G., Zhao, X. et al. Preparation and Microstructure Characterization of Mullite Coatings Made of Mullitized Natural Andalusite Powders. J Therm Spray Tech 20, 479–485 (2011). https://doi.org/10.1007/s11666-010-9536-6

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  • DOI: https://doi.org/10.1007/s11666-010-9536-6

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