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Thermophysical properties of solution precursor plasma-sprayed La2Ce2O7 thermal barrier coatings

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Abstract

La2Ce2O7 (LCO) is a promising candidate for thermal barrier coatings (TBCs) due to that it provides better thermal insulation than yttria-stabilized zirconia (YSZ) does. In this work, a TBC LCO was produced by solution precursor plasma spraying (SPPS). After the solution precursors were prepared and the spraying parameters were optimized, the thermophysical properties and thermal shock performance of the coatings were tested. It was found that the SPPS coating with segmentation crack density of 6 mm−1 had the porosities of about 33.5% at spray distances of 35 mm. The thermal conductivity of the SPPS coatings is 0.50–0.75 W·m−1·K−1, much lower than that of the atmospheric plasma spraying (APS) coatings (0.85–1.25 W·m−1·K−1). The thermal shock performance of the SPPS coatings reached 60 cycles, much better than the APS coatings. This improvement is due to the segmentation cracks in the coatings, which can improve strain tolerance and effectively relieve internal stress. This study provides reference significance for further research on thermal barrier coatings.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (Nos. 51571002 and 51401003) and Beijing Municipal Natural Science Foundation (Nos. 2172008 and KZ201310005003).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beijing University of Technology, Beijing, 100022, China

    Bei-Bei Feng, Yi Wang, Qiang Jia & Hong-Li Suo

  2. The Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing, 100022, China

    Bei-Bei Feng, Yi Wang, Qiang Jia & Hong-Li Suo

  3. School of Materials Science and Engineering, Inner Mongolia University of Technology, Huhhot, 010051, China

    Wei Huang & Wen Ma

Authors
  1. Bei-Bei Feng
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  2. Yi Wang
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  4. Wei Huang
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  5. Hong-Li Suo
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  6. Wen Ma
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Correspondence to Yi Wang.

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Feng, BB., Wang, Y., Jia, Q. et al. Thermophysical properties of solution precursor plasma-sprayed La2Ce2O7 thermal barrier coatings. Rare Met. 38, 689–694 (2019). https://doi.org/10.1007/s12598-019-01286-3

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  • DOI: https://doi.org/10.1007/s12598-019-01286-3

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