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Evaluation of Generation Mechanism of Vertical Cracks in Top Coat of TBCs During APS Deposition by Laser AE Method

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Abstract

Vertical cracks can be generated in the top coat of thermal barrier coatings (TBCs) deposited by atmospheric plasma spraying (APS). Since they are known to improve the durability of TBCs such as in the case of dense vertically cracked TBC, clarification of the mechanism and the criteria of cracking are very important. In this study, generation of such vertical cracks was monitored during APS process by laser acoustic emission (AE) method, which is an in situ, non-contact, and non-destructive technique. Temperature was also monitored inside and on the surface of a specimen during APS process for estimation of the temperature field in the top coat. Results of the AE and temperature monitoring were combined to evaluate the relationship between cracking and thermal stress in the top coat. Most of the AE events due to the generation of vertical cracks were detected during rapid heating of the surface of the top coat by the heat flux from the torch. It showed that the vertical cracks were induced due to the tensile stress caused by the temperature difference in the top coat from the rapid heating. Furthermore, the estimated critical thermal stress for vertical cracking from the monitoring results was consistent with a previously reported strength of YSZ coating deposited by thermal spray.

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Acknowledgment

We thank Mr. Hiraoka and Mr. Komatsu for supporting fabrication of our equipment and operation of the APS system. This work was partially supported by MEXT/JSPS KAKENHI Grant Number 23246124.

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Authors and Affiliations

  1. The University of Tokyo, Tokyo, Japan

    K. Ito, H. Kuriki & M. Enoki

  2. National Institute for Materials Science, Tsukuba, Japan

    H. Araki & S. Kuroda

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  1. K. Ito
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  2. H. Kuriki
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  3. H. Araki
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  4. S. Kuroda
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  5. M. Enoki
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Correspondence to K. Ito.

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Ito, K., Kuriki, H., Araki, H. et al. Evaluation of Generation Mechanism of Vertical Cracks in Top Coat of TBCs During APS Deposition by Laser AE Method. J Therm Spray Tech 24, 848–856 (2015). https://doi.org/10.1007/s11666-015-0247-x

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  • DOI: https://doi.org/10.1007/s11666-015-0247-x

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