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Effect of Microstructure on the Thermal Conductivity of Plasma-Sprayed Al2O3-YSZ Coatings

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Abstract

The microstructures of three atmospheric plasma-sprayed (APS) Al2O3-ZrO2 coatings were investigated using x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The differences in the microstructures of the three Al2O3-ZrO2 coatings, including their phase compositions, cracks, pores, grain sizes, and solid solutions, were analyzed in detail. A close relationship was observed between the thermal conductivities of the coatings and the microstructures, and the Al2O3-YSZ coatings with more spherical pores, fewer vertical cracks, and finer grains exhibited the lowest thermal conductivity of 0.91 W/m·K. Compared with YSZ coatings, Al2O3-YSZ coatings can exhibit lower thermal conductivity, which may be attributed to the formation of an amorphous phase, smaller grains, and Al2O3-YSZ solid solution.

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Acknowledgments

Financial support for this study was provided by the Research Project Fund of the International Science & Technology Cooperation Project of China (2013DFG52290), Science & Technology Innovation Key Project of Shanghai Institute of Ceramics (Y37ZC4141G), Shanghai Technical Platform for Testing and Characterization on Inorganic Materials (14DZ2292900) and the CAS Key Technology Talent Program.

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Authors and Affiliations

  1. The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China

    Xuemei Song, Ziwei Liu, Yongzhe Wang & Yi Zeng

  2. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, China

    Mingguang Kong

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

    Liping Huang & Xuebin Zheng

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  1. Xuemei Song
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  2. Ziwei Liu
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  3. Mingguang Kong
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  4. Yongzhe Wang
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  5. Liping Huang
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  6. Xuebin Zheng
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  7. Yi Zeng
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Correspondence to Yi Zeng.

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Song, X., Liu, Z., Kong, M. et al. Effect of Microstructure on the Thermal Conductivity of Plasma-Sprayed Al2O3-YSZ Coatings. J Therm Spray Tech 25, 770–777 (2016). https://doi.org/10.1007/s11666-016-0389-5

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  • DOI: https://doi.org/10.1007/s11666-016-0389-5

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