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Anisotropic Mechanical Properties of Plasma-Sprayed Thermal Barrier Coatings at High Temperature Determined by Ultrasonic Method

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Abstract

The mechanical properties of plasma-sprayed thermal barrier coatings (TBC) are of great scientific and technological significance for the design and fabrication of TBC systems. The ultrasonic method combined with a sing-around method for mechanical properties measurement of TBC is deduced and the elastic modulus can be determined in the spray, or longitudinal, direction, and the transverse direction. Tested specimens of plasma-sprayed TBC are detached from the substrate and treated with thermal exposure at 1400 °C. The elastic moduli along the longitudinal and transverse directions of the TBCs are measured by different types of ultrasonic waves combined with a sing-around method, while the Poisson’s ratio is also obtained simultaneously. The experimental results indicate that the magnitude of longitudinal elastic modulus is larger than that of the transverse one, and thus the plasma-sprayed TBC has an anisotropic mechanical property. Moreover, the elastic moduli along both longitudinal and transverse directions change with high-temperature exposure time, which consists of a rapid increasing stage followed by a slow decreasing stage. In addition, the magnitude of Poisson’s ratio increases slightly from 0.05 to 0.2 with the high-temperature exposure time. Generally, the microstructures in the plasma-sprayed coatings and their evolution in a high-temperature environment are the main causes of the varying anisotropic mechanical properties.

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Acknowledgment

The authors are grateful for the financial support from the National Natural Science Foundation of China (Grant Nos. 11232008 and 11372118).

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Authors and Affiliations

  1. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, 212013, Jiangsu, China

    Qin Wei & Jianguo Zhu

  2. Faculty of Science, Jiangsu University of Science and Technology, Zhenjiang, 212013, China

    Qin Wei & Wei Chen

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  1. Qin Wei
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  2. Jianguo Zhu
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  3. Wei Chen
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Correspondence to Jianguo Zhu.

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Wei, Q., Zhu, J. & Chen, W. Anisotropic Mechanical Properties of Plasma-Sprayed Thermal Barrier Coatings at High Temperature Determined by Ultrasonic Method. J Therm Spray Tech 25, 605–612 (2016). https://doi.org/10.1007/s11666-016-0378-8

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  • DOI: https://doi.org/10.1007/s11666-016-0378-8

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