|Error and modification in thermal barrier coatings measurement using impedance spectroscopy|
|Yang L; Zhu W; Li CF; Zhou YC; Wang NG; Wei YG(魏悦广); Yang, L; Zhou, YC (reprint author), Xiangtan Univ, Sch Mat Sci & Engn, Key Lab Key Film Mat & Applicat Equipment Hunan P, Xiangtan 411105, Hunan, Peoples R China.
|Source Publication||CERAMICS INTERNATIONAL
|Abstract||In 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|
Divergence Of Electric Field
Thermal Barrier Coating
|WOS Keyword||YTTRIA-STABILIZED ZIRCONIA
; NONDESTRUCTIVE EVALUATION
|WOS Research Area||Materials Science
|WOS Subject||Materials Science, Ceramics
|Funding Organization||National Natural Science Foundation of China(51590891
; Distinguished Young Scholar Foundation of Hunan Province(2016JJ1014)
; Outstanding Youth Foundation of Hunan Provincial Education Department(16B249)
|Corresponding Author||Yang, L; Zhou, YC (reprint author), Xiangtan Univ, Sch Mat Sci & Engn, Key Lab Key Film Mat & Applicat Equipment Hunan P, Xiangtan 411105, Hunan, Peoples R China.|
Yang L,Zhu W,Li CF,et al. Error and modification in thermal barrier coatings measurement using impedance spectroscopy[J]. CERAMICS INTERNATIONAL,2017,43(6):4976-4983.
Yang L.,Zhu W.,Li CF.,Zhou YC.,Wang NG.,...&Zhou, YC .(2017).Error and modification in thermal barrier coatings measurement using impedance spectroscopy.CERAMICS INTERNATIONAL,43(6),4976-4983.
Yang L,et al."Error and modification in thermal barrier coatings measurement using impedance spectroscopy".CERAMICS INTERNATIONAL 43.6(2017):4976-4983.
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