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Microstructure and Thermal Properties of Plasma Sprayed Thermal Barrier Coatings from Nanostructured YSZ

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Abstract

Nanostructured yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) were produced by atmospheric plasma spraying. The microstructure of the sprayed coating was characterized by transmission electron microscope (TEM) and scanning electron microscope (SEM). The nano-coating had a higher porosity of ~25% than the conventional coating, which is mainly attributed to the large amount of intersplat gaps in the nano-coating. The thermal conductivity for the nano-coating was in the level of 0.8-1.1 W/m·K, about 40% lower than that for the conventional coating, indicating a better thermal insulation performance. The nano-TBC exhibited a thermal cycling lifetime of more than 500 cycles, whereas spallation failure of the conventional TBC occurred within 200 cycles. Accelerated sintering could be one of the reasons for the failure of the nano-TBC.

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Acknowledgments

This research is sponsored by the New Century Excellent Talents in University (NCET) and National Nature Science Foundation of China (NSFC, No. 50771009 and No. 50731001).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Beihang University, No. 37, Xueyuan Road, Beijing, 100191, China

    Jing Wu, Hong-bo Guo, Le Zhou, Lu Wang & Sheng-kai Gong

  2. Beijing Key Laboratory for Advanced Functional Materials and China Film Technology, Beihang University, No. 37, Xueyuan Road, Beijing, 100191, China

    Jing Wu, Hong-bo Guo, Le Zhou & Sheng-kai Gong

Authors
  1. Jing Wu
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  2. Hong-bo Guo
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  3. Le Zhou
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  4. Lu Wang
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  5. Sheng-kai Gong
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Corresponding authors

Correspondence to Hong-bo Guo or Sheng-kai Gong.

Additional information

This article is an invited paper selected from presentations at the 4th Asian Thermal Spray Conference (ATSC 2009) and has been expanded from the original presentation. ATSC 2009 was held at Nanyang Hotel, Xi’an Jiaotong University, Xi’an, China, October 22-24, 2009, and was chaired by Chang-Jiu Li.

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Wu, J., Guo, Hb., Zhou, L. et al. Microstructure and Thermal Properties of Plasma Sprayed Thermal Barrier Coatings from Nanostructured YSZ. J Therm Spray Tech 19, 1186–1194 (2010). https://doi.org/10.1007/s11666-010-9535-7

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  • DOI: https://doi.org/10.1007/s11666-010-9535-7

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