Characterization of Isothermally Oxidized ZrO2-8wt.%Y2O3 Thermal Barrier Coatings by Electrochemical Impedance Spectroscopy

2005 ◽  
pp. 145-148
Author(s):  
Jai Won Byeon ◽  
B. Jayaraj ◽  
Yong Ho Sohn
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Thermal Barrier Coatings ◽  
Electrochemical Impedance ◽  
Thermal Barrier ◽  
Barrier Coatings

Post-Exposure Evaluation of Thermal Barrier Coatings by Electrochemical Impedance Spectroscopy

2000 ◽  
Vol 645 ◽  
Author(s):  
Jianqi Zhang ◽  
Vimal Desai
Keyword(s):  
High Temperature ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Thermal Barrier Coatings ◽  
Electrochemical Impedance ◽  
Morphological Properties ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Barrier Coatings ◽  
Functional Relationships

ABSTRACTHigh temperature behavior of air plasma sprayed (APS) thermal barrier coatings (TBC) was investigated in this study by electrochemical impedance spectroscopy (EIS). Scanning electron microscope (SEM) was used to examine cross-sectional morphology of exposed TBC. It was found that characteristic EIS spectra were obtained effectively to differentiate variant post-exposed TBC such as isothermal oxidation and cyclic oxidation. In addition, the type and length of high temperature exposure were qualitatively discernible from the EIS data. A model of an EIS alternative current (AC) equivalent circuit was proposed quantitatively to relate the EIS parameters to the morphological properties of the exposed TBC and functional relationships have been established between them. From the results, EIS has been identified capable of monitoring the microstructure of post-exposed TBC and evaluating TBC damage.

Quality Assurance Evaluation of Thermal Barrier Coatings by Electrochemical Impedance Spectroscopy

2000 ◽  
Vol 645 ◽  
Author(s):  
Jianqi Zhang ◽  
Danyash Tamboli ◽  
Vimal Desai
Keyword(s):  
Quality Assurance ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Linear Relationship ◽  
Thermal Barrier Coatings ◽  
Electrical Impedance ◽  
Electrochemical Impedance ◽  
Thermal Barrier ◽  
Morphological Examination ◽  
Barrier Coatings

ABSTRACTThe technique of electrochemical impedance spectroscopy (EIS) was used to examine the behavior of intact thermal barrier coatings (TBC) at ambient temperature. Cross-sectional morphological examination of TBC was conducted by scanning electron microscope (SEM). By correlating the SEM visual examination with EIS data, TBC was characterized non-destructively. A model of EIS alternative current (AC) equivalent circuit was proposed to establish the relationship between the EIS elemental parameters in the circuit and the microstructural characteristics of TBC. A linear relationship was found to exist between the electrical impedance of TBC topcoat and the thickness of the topcoat. The porosity of TBC top coat showed a linear relationship with the capacitance of ceramic TBC, and the pore shape in the TBC topcoat was represented by the value of the electrical impedance of the pore. The result in the study has demonstrated that EIS can be used as a non-destructive evaluation (NDE) technique for quality assurance of TBC.

scholarly journals Correction to: Electrochemical Impedance Spectroscopy Characterization of Silicon-Based Electrodes for Li-Ion Batteries

2020 ◽  
Vol 11 (3) ◽  
pp. 364-364
Author(s):  
Maciej Ratynski ◽  
Bartosz Hamankiewicz ◽  
Michał Krajewski ◽  
Maciej Boczar ◽  
Dominika A. Buchberger ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Li Ion Batteries ◽  
Li Ion ◽  
Silicon Based

NONDESTRUCTIVE IMPEDANCE SPECTROSCOPY EVALUATION OF THE BOND COAT OXIDATION IN THERMAL BARRIER COATINGS

2007 ◽  
Vol 14 (05) ◽  
pp. 935-943 ◽  
Author(s):  
L. YANG ◽  
Y. C. ZHOU ◽  
W. G. MAO ◽  
Q. X. LIU
Keyword(s):  
Impedance Spectroscopy ◽  
Thermal Barrier Coatings ◽  
Bond Coat ◽  
Equivalent Circuit Model ◽  
Isothermal Oxidation ◽  
Thermally Grown Oxide ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Barrier Coatings ◽  
Plasma Sprayed

In this paper, the impedance spectroscopy technique was employed to examine nondestructively the isothermal oxidation of air plasma sprayed (APS) thermal barrier coatings (TBCs) in air at 800°C. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) were also used to characterize the microstructure evolution of TBCs. After oxidation, the thermally grown oxide (TGO), which was mainly composed of alumina as confirmed by EDX, formed at the upper ceramic coat/bond coat interface, the lower bond coat/substrate interface, and the bond coat. Impedance diagrams obtained from impedance measurements at room temperature were analyzed according to the equivalent circuit model proposed for the TBCs. Various observed electrical responses relating to the growth of oxides and the sintering of YSZ were explained by simulating the impedance spectra of the TBCs.

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