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Thermal barrier coatings (TBCs) enable the hot section part to work at high temperatures owing to their thermal barrier effect on the base metal components. However, localized spallation in the ceramic top-coat might occur after long duration of thermal exposure or thermal cycling. To comprehensively understand the damage of the top-coat on the overall hot section part, effects of diameter and tilt angle of the spallation on the temperature redistribution of the substrate and the top-coat were investigated. The results show that the spallation diameter and tilt angle both have a significant effect on the temperature redistribution of the top-coat and the substrate. In the case of the substrate, the maximum temperature increment is located at the spallation center. Meanwhile, the surface (depth) maximum temperature increment, having nothing to do with the tilt angle, increases with the increase of the spallation diameter. In contrast, in the case of the top-coat, the maximum temperature increment was located at the sharp corner of the spallation area, and the surface (depth) maximum temperature increment increases with the increase of both the spallation diameter and the tilt angle. Based on the temperature redistribution of the substrate and the top-coat affected by the partial spallation, it is possible to evaluate the damage effect of spalled areas on the thermal capability of TBCs.


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Comprehensive damage evaluation of localized spallation of thermal barrier coatings

Show Author's information Wei-Wei ZHANGa,b,cGuang-Rong LIaQiang ZHANGa,dGuan-Jun YANGa( )
State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Institute of Publication Science, Chang’an University, Xi’an 710064, China
School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China
AECC Beijing Institute of Aeronautical Material, Beijing 100095, China

Abstract

Thermal barrier coatings (TBCs) enable the hot section part to work at high temperatures owing to their thermal barrier effect on the base metal components. However, localized spallation in the ceramic top-coat might occur after long duration of thermal exposure or thermal cycling. To comprehensively understand the damage of the top-coat on the overall hot section part, effects of diameter and tilt angle of the spallation on the temperature redistribution of the substrate and the top-coat were investigated. The results show that the spallation diameter and tilt angle both have a significant effect on the temperature redistribution of the top-coat and the substrate. In the case of the substrate, the maximum temperature increment is located at the spallation center. Meanwhile, the surface (depth) maximum temperature increment, having nothing to do with the tilt angle, increases with the increase of the spallation diameter. In contrast, in the case of the top-coat, the maximum temperature increment was located at the sharp corner of the spallation area, and the surface (depth) maximum temperature increment increases with the increase of both the spallation diameter and the tilt angle. Based on the temperature redistribution of the substrate and the top-coat affected by the partial spallation, it is possible to evaluate the damage effect of spalled areas on the thermal capability of TBCs.

Keywords:

thermal barrier coatings (TBCs), thermal property, localized spallation, damage evaluation
Received: 22 January 2017 Revised: 26 May 2017 Accepted: 31 May 2017 Published: 29 September 2017 Issue date: September 2017
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Publication history
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Publication history

Received: 22 January 2017
Revised: 26 May 2017
Accepted: 31 May 2017
Published: 29 September 2017
Issue date: September 2017

Copyright

© The author(s) 2017

Acknowledgements

This work is supported by the National Basic Research Program of China (No. 2013CB035701), the National Natural Science Foundation of China (Grant No. 51671159), the Fundamental Research Funds for the Central Universities, and the National Program for Support of Top-notch Young Professionals.

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