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http://dx.doi.org/10.7779/JKSNT.2013.33.1.46

Influence of Compressive Stress in TGO Layer on Impedance Spectroscopy from TBC Coatings  

Kang, To (School of Mechanical Engineering, Sungkyunkwan University)
Zhang, Jianhai (School of Mechanical Engineering, Sungkyunkwan University)
Yuan, Maodan (School of Mechanical Engineering, Sungkyunkwan University)
Song, Sung-Jin (School of Mechanical Engineering, Sungkyunkwan University)
Kim, Hak-Joon (School of Mechanical Engineering, Sungkyunkwan University)
Kim, Yongseok (School of Mechanical Engineering, Sungkyunkwan University)
Seok, Chang Sung (School of Mechanical Engineering, Sungkyunkwan University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.33, no.1, 2013 , pp. 46-53 More about this Journal
Abstract
Impedance spectroscopy is a non-destructive evaluation (NDE) method first proposed and developed for evaluating TGO layers with compressive stress inside thermally degraded plasma-sprayed thermal barrier coatings (PS TBCs). A bode plot (phase angle (h) vs. frequency (f)) was used to investigate the TGO layer on electrical responses. In our experimental study, the phase angle of Bode plots is sensitive for detecting TGO layers while applying compressive stress on thermal barrier coatings. It is difficult to detect TGO layers in samples isothermally aged for 100 hrs and 200 hrs without compressive stress, and substantial change of phase was observed these samples with compressive stress. Also, the frequency shift of the phase angle and change of the phase angle are observed in samples isothermally aged for more than 400 hrs.
Keywords
Impedance Spectroscopy; Compressive Stress; Thermal Barrier Coating (TBC); TGO Layer;
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