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Influence of Feedstock on the Microstructure of Sm2Zr2O7 Thermal Barrier Coatings Deposited by Plasma Spraying

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Abstract

Four Sm2Zr2O7 (SZO) powders with different morphologies were deposited by atmospheric plasma spraying on superalloy substrates using the same spraying parameters. Both the particle size distribution and microstructure of the powders had an important effect on the coating microstructure. SZO thermal barrier coatings (TBCs) deposited using the powder with a narrow particle size distribution showed a better “molten state” and exhibited a higher average bonding strength compared with the SZO TBCs deposited using the powder with a wide particle size distribution. The dense microstructure of the calcined powder sintered at high temperature and of the powder spheroidized by plasma spraying gun (SF) improved the melting capacity of the powders, and the resulting coatings showed a compact microstructure with unique bimodal structures. Furthermore, the SF SZO TBCs presented an excellent “molten state” with a smooth surface and exhibited a high bonding strength of 29.6 ± 0.15 MPa.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 51772027).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China

    Wei Guo, Zhuang Ma, Ling Liu & Yanbo Liu

  2. National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing, 100081, China

    Wei Guo, Zhuang Ma, Ling Liu & Yanbo Liu

Authors
  1. Wei Guo
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  2. Zhuang Ma
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  3. Ling Liu
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  4. Yanbo Liu
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Correspondence to Ling Liu.

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Guo, W., Ma, Z., Liu, L. et al. Influence of Feedstock on the Microstructure of Sm2Zr2O7 Thermal Barrier Coatings Deposited by Plasma Spraying. J Therm Spray Tech 27, 1524–1531 (2018). https://doi.org/10.1007/s11666-018-0803-2

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  • DOI: https://doi.org/10.1007/s11666-018-0803-2

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