Abstract No.:
5260

 Scheduled at:
Friday, June 09, 2017, Hall 12 9:20 AM
Aviation & Power Generation Industry V


 Title:
Evolution of residual stress in the thermally grown oxide of PS-PVD TBCs during thermal cycling

 Authors:
Shunyan Tao* / Shanghai Institute of Ceramics, Chinese Academy of Sciences, P.R. China
Jiasheng Yang/ Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, PR China
Huayu Zhao/ Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, PR China
Chenguang Liu/ Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, PR China
Yin Zhuang/ Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, PR China
Jinxing Ni/ Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, PR China
Xinghua Zhong/ Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, PR China

 Abstract:
Photoluminescence piezo-spectroscopy (PLPS) has been used as a non-destructive inspection technique for the measurement of residual stress within the thermally grown oxide (TGO) layer through yttria stabilized zirconia (YSZ) thermal barrier coatings (TBCs). In this study, plasma spray-physical vapor deposition (PS-PVD) process was used to deposit YSZ coatings with quasi-columnar structures. Evolution of the microstructures and failure behaviors of such type of structured TBCs before and after burner rig test were investigated. Residual stress in the TGO was measured by PLPS and stress maps created to track local stress changes as a function of thermal cycling. Stress mapping showed that there were regions where the stresses were particularly low and these were attributed to local TGO damage or delamination. The evolution of photo-stimulated luminescence spectra was discussed and related to the progressive damage and the final spallation of the TBCs.

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