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Nanocomposite Lanthanum Zirconate Thermal Barrier Coating Deposited by Suspension Plasma Spray Process

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Abstract

This work seeks to develop an innovative nanocomposite thermal barrier coating (TBC) exhibiting low thermal conductivity and high durability compared with that of current TBCs. To achieve this objective, nanosized lanthanum zirconate particles were selected for the topcoat of the TBC system, and a new process—suspension plasma spray—was employed to produce desirable microstructural features: the nanocomposite lanthanum zirconate TBC contains ultrafine splats and high volume porosity, for lower thermal conductivity, and better durability. The parameters of plasma spray experiment included two main variables: (i) spray distance varying from 40 to 80 mm and (ii) the concentration of suspension 20, 25, and 30 wt.%, respectively. The microstructure of obtained coatings was characterized with scanning electron microscope and x-ray diffraction. The porosity of coatings is in the range of 6-10%, and the single phase in the as-sprayed coatings was pyrochlore lanthanum zirconate.

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Acknowledgments

This work was supported by the young scientist project of Natural Science Foundation of China (NSFC) (No. 51303087) and the program for young teachers’ scientific research in Qiqihar University (No. 2011k-M24).

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Authors and Affiliations

  1. Laboratory of Nano Surface Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Chaohui Wang, You Wang, Xiaoguang Sun & Zhiwei Zou

  2. College of Materials Science and Engineering, Qiqihar University, Qiqihar, 161006, People’s Republic of China

    Chaohui Wang, Guangzhao Hao & Fan Shan

  3. Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201899, People’s Republic of China

    Liang Wang

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  1. Chaohui Wang
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Correspondence to Chaohui Wang.

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Wang, C., Wang, Y., Wang, L. et al. Nanocomposite Lanthanum Zirconate Thermal Barrier Coating Deposited by Suspension Plasma Spray Process. J Therm Spray Tech 23, 1030–1036 (2014). https://doi.org/10.1007/s11666-014-0068-3

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  • DOI: https://doi.org/10.1007/s11666-014-0068-3

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