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Multiscale Pores in TBCs for Lower Thermal Conductivity

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Abstract

The morphology and pattern (including orientation and aspect ratio) of pores in thermal barrier coatings (TBCs) significantly affect their thermal insulation performance. In this work, finite element analysis was used to comprehensively understand the thermal insulation effect of pores and correlate the effective thermal conductivity with the structure. The results indicated that intersplat pores, and in particular their aspect ratio, dominantly affect the heat transfer in the top coat. The effective thermal conductivity decreased as a function of aspect ratio, since a larger aspect ratio often corresponds to a greater proportion of effective length of the pores. However, in conventional plasma-sprayed TBCs, intersplat pores often fail to maximize thermal insulation due to their distinct lower aspect ratios. Therefore, considering this effect of aspect ratio, a new structure design with multiscale pores is proposed and a corresponding structural model developed to correlate the thermal properties with this pore-rich structure. The predictions of the model are well consistent with experimental data. This study provides comprehensive understanding of the effect of pores on the thermal insulation performance, shedding light on the possibility of structural tailoring to obtain advanced TBCs with lower thermal conductivity.

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Acknowledgments

This project was supported by the National Basic Research Program of China (No. 2013CB035701), the Fundamental Research Funds for the Central Universities, and the National Program for Support of Top-notch Young Professionals.

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Authors and Affiliations

  1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Wei-Wei Zhang, Guang-Rong Li, Qiang Zhang & Guan-Jun Yang

  2. Institute of Publication Science, Chang’an University, Xi’an, 710064, China

    Wei-Wei Zhang

  3. School of Materials Science and Engineering, Chang’an University, Xi’an, 710064, China

    Wei-Wei Zhang

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  1. Wei-Wei Zhang
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Correspondence to Guan-Jun Yang.

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Zhang, WW., Li, GR., Zhang, Q. et al. Multiscale Pores in TBCs for Lower Thermal Conductivity. J Therm Spray Tech 26, 1183–1197 (2017). https://doi.org/10.1007/s11666-017-0585-y

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