Impedance spectroscopy study of plasma sprayed and EB-PVD thermal barrier coatings

Anderson, Piers S.; Wang, X; Xiao, Ping

doi:10.1016/j.surfcoat.2003.12.022

Cited by 39 publications

(17 citation statements)

References 30 publications

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“…Due to the spread of electrical conduction region in TGO, the TGO resistance decreases, which results in the reduction of the size of TGO semi-circle. The above results are consistent with the experiment results obtained by Anderson et al [19]. The Bode plot of the IS of TBCs with different YSZ thickness are shown in Fig.…”

Section: Error Of Thickness Measurement Using Asymmetric Electrodesupporting

confidence: 93%

“…The YSZ thickness has no influence on the YSZ peak in the high frequency and electrode response in the low frequency, while the TGO peak in the medium frequency reduces with increase of YSZ thickness. The similar phenomenon is observed by Anderson et al [19]. Table 2 gives the measurement errors of YSZ and TGO thickness due to the effect of YSZ thickness.…”

Section: Error Of Thickness Measurement Using Asymmetric Electrodesupporting

confidence: 83%

“…In the Bode plot (see Fig. 7(b)), as Pt electrode size increases, the TGO response appears to increase, [19]. The impedance response of TBCs with different Pt electrode sizes is measured by IS testing experimentally [17].…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, it is reasonable to present the following questions: whether the impedance results are affected by asymmetric electrode, how to affect impedance feature, and how to overcome the errors of measurement results induced by asymmetric electrode. Several experimental investigations find that both electrode geometry and size have the significant effect on impedance feature [9,19,20], and sometimes asymmetric electrode geometry can lead to the spread of an electrical conduction region in TBCs, while it is not reliable to find it in experiments and not to present to measure the divergence of electric field quantitatively. Using finite element method, Deng et al [21] investigated the effects of TGO growth and conductivity on the IS distribution of TBCs produced by the electron beam physical vapor deposition.…”

Section: Introductionmentioning

confidence: 99%

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Error and modification in thermal barrier coatings measurement using impedance spectroscopy

Yang

Zhu

et al. 2017

Ceramics International

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A B S T R A C TIn impedance spectroscopy testing of metal/ceramic multi-layers, such as thermal barrier coatings (TBCs), in order to avoid electric leakage, asymmetric electrode is widely adopted. However, how is electric field distribution in asymmetric electrode system, what error does it bring to measurement results, and how to modify these errors etc., are still not understood. In this study, electric field divergence in TBCs measurement induced by asymmetric electrode is investigated through solving a three-dimensional electric field equations numerically. The results show that the asymmetric electrode inevitably triggers divergence of electric field line, and as frequency decreases the divergence increases considerably. When Pt electrode diameter is chosen as 1 mm in ceramic coating, the errors in thickness measurement for both YSZ and TGO are 26.20% and 89.3%, respectively. The errors rise as both YSZ and TGO thicknesses increase, while the errors decrease as Pt electrode size increases. The error in thickness measurement for TGO layer is much larger than that for YSZ. Through present research, a scheme to eliminate the effect of electric field divergence on measurement error is proposed.

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Section: Error Of Thickness Measurement Using Asymmetric Electrodesupporting

confidence: 93%

Section: Error Of Thickness Measurement Using Asymmetric Electrodesupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Error and modification in thermal barrier coatings measurement using impedance spectroscopy

Yang

Zhu

et al. 2017

Ceramics International

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“…Manchester University -Ping -has developed the impedance spectroscopy for damage evaluation, [71] however, the development of novel NDE techniques seems to focus on optical techniques. Piezo-spectroscopy is being developed in particular at Imperial College London for some years [72] looking at stress distributions at the bond coat mapping damage zones.…”

Section: Nde Methodsmentioning

confidence: 99%

Recent Activities in the Field of Thermal Barrier Coatings Including Burner Rig Testing in the European Union

et al. 2008

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Although thermal barrier coatings are used in industry for several decades there is still considerable demand for a further improvement of this coating system. Present research projects are for example dealing with the improvement of temperature capability and lifetime, developing of lifetime models, new processing technologies, or incorporating of additional functional properties in the coating. The present paper tries to give an overview on these recent research activities. In addition, it will also try to describe the different burner rig test facilities in Europe, which serve as an important test bed of thermal barrier coating systems.

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Coating Characterizations

Fauchais¹,

Heberlein²,

Boulos³

2013

Thermal Spray Fundamentals

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Impedance spectroscopy study of plasma sprayed and EB-PVD thermal barrier coatings

Cited by 39 publications

References 30 publications

Error and modification in thermal barrier coatings measurement using impedance spectroscopy

Error and modification in thermal barrier coatings measurement using impedance spectroscopy

Recent Activities in the Field of Thermal Barrier Coatings Including Burner Rig Testing in the European Union

Coating Characterizations

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