Abstract
In this paper, the failure behavior of plasma-sprayed yttria-stabilized zirconia thermal barrier coatings fabricated by atmospheric plasma spraying (APS-TBCs) under three-point bending (3PB) test has been characterized via acoustic emission (AE) technique. Linear positioning method has been adopted to monitor dynamic failure process of the APS-TBCs under 3PB test. The investigation results indicate that the variation of AE parameters (AE event counts, amplitudes and AE energy) corresponds well with the change of stress–strain curve of the loading processes. The failure mechanism was analyzed based on the characteristics of AE parameters. The distribution of frequency of crack propagation has been obtained. The AE signals came from two aspects: i.e., plastic deformation of substrates, initiation and propagation of the cracks in the coatings. The AE analysis combined with cross-sectional observation has indicated that many critical cracks initiate at the surface of the top-coat. And some main cracks tend to propagate toward the substrate/bond-coat interface. The actual failure mechanism of the APS-TBCs under 3PB test is attributed to the debonding of metallic coating from the substrates and the propagation of the horizontal crack along the substrate/bond-coat interface under the action of flexural moment.
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Acknowledgment
We express our gratitude to Mrs. Li Lei and Gao Jianhua for their experimental assistance. This work was jointly supported by the National Natural Science Foundation (NSFC) under the Grant No. 51671208, Natural Science Foundation of Shanghai (No. 16ZR1440700) and Laboratory foundation of Chinese Academy of Sciences (Grant No. 16S084). And we also give our thanks to the special Project for Army-Civilian Combination of Shanghai Municipal Commission of Economy and Informatization (Grant No. JMJH2014053). The current work was also supported by the Key Research Program of Chinese Academy of Sciences (No. KGZD-EW-T06) and the research grant (No. 14DZ2261203) from Shanghai government.
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This article is an invited paper selected from presentations at the 2016 International Thermal Spray Conference, held May 10-12, 2016, in Shanghai, P. R. China, and has been expanded from the original presentation.
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Wang, L., Ni, J.X., Shao, F. et al. Failure Behavior of Plasma-Sprayed Yttria-Stabilized Zirconia Thermal Barrier Coatings Under Three-Point Bending Test via Acoustic Emission Technique. J Therm Spray Tech 26, 116–131 (2017). https://doi.org/10.1007/s11666-016-0497-2
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DOI: https://doi.org/10.1007/s11666-016-0497-2