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Investigation into the evolution of interface fracture toughness of thermal barrier coatings with thermal exposure treatment by wedge indentation

Published online by Cambridge University Press:  23 April 2020

Yue M. Wang ,
Wei X. Weng ,
Ming H. Chi ,
Bai L. Liu  and
Qiang Li
Yue M. Wang
Affiliation:
School of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China
Wei X. Weng
Affiliation:
School of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China
Ming H. Chi
Affiliation:
School of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China
Bai L. Liu
Affiliation:
School of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China
Qiang Li*
Affiliation:
School of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China
*
a)Address all correspondence to this author. e-mail: qli@fzu.edu.cn
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Abstract

Thermal barrier coating is a high-temperature protective technology widely used in industrial gas turbines. However, the failure of coating peeling because of the generation of thermally grown oxide (TGO) at the interface during service hinders its further application. In this study, Raman spectroscopy and wedge indentation are used to determine the TGO residual stress and the interface energy release rate, respectively. The effect of TGO on the interfacial fracture toughness during the growth process was discussed. Raman spectroscopy test results show that the residual stress of TGO is about 0.5 GPa. Wedge indentation test results illustrate that high-temperature heat treatment could accelerate the interface degradation of thermal barrier coatings. Stress analysis and test research demonstrate that the microcracks induced by compressive stress of TGO will propagate with increasing heating time, ending with failure of barrier coatings.

Keywords

thermal barrier coatingsinterface fracturethermally grown oxide stress

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Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 13: Focus Section: Interactions of Shear Transformation Bands , 14 July 2020 , pp. 1715 - 1725
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Copyright © Materials Research Society 2020

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