Non-destructive characterisation of thermal barrier coatings using impedance spectroscopy

Junfa Mei, Xin Wang, Ping Xiao

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


Impedance spectroscopy (IS) has been used to characterise the degradation of thermal barrier coatings (TBCs) due to thermal treatments at 1100°C for a period up to 200 hrs. The growth of the oxide layer at the yttria stabilised zirconia (YSZ)/bond coat interface in TBCs can be examined by measuring the impedance diagrams. From the analysis of the impedance diagrams of TBCs, the electrical properties of YSZ were found to be nearly constant during the thermal treatments, indicating there was little change in the microstructure and composition of YSZ. However, there was a clear change in the electrical properties of the oxide layer in the TBCs after thermal treatments, suggesting both microstructural and composition changes occurred in the oxide layer. These studies indicate that the IS is a very useful method in non-destructive characterisation of the degradation of TBCs.

Original languageEnglish
Title of host publicationThermal Barrier Coatings 2000
Number of pages6
Publication statusPublished - 1 Dec 2001
Externally publishedYes
Event2000 MRS Fall Meeting - Boston, MA, United States of America
Duration: 27 Nov 20001 Dec 2000

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Conference2000 MRS Fall Meeting
CountryUnited States of America
CityBoston, MA

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