The Impedance Spectroscopy Study of the Oxides Layer in Thermal Barrier Coatings

Abstract:

Air-plasma-sprayed (APS) thermal barrier coatings (TBCs) were oxidized in air at different temperatures for 1000h and sequentially investigated by impedance spectroscopy (IS) and scanning electron microscopy (SEM). After oxidation at temperatures higher than 900°C, a thermally grown oxide (TGO) layer was formed at the bond coat/topcoat interface in TBCs. The impedance spectra of oxidized TBCs typically contains two relaxation processes that stem from the yttria-stabilized zirconia (YSZ) topcoat of TBCs and the TGO layer. The TGO resistivity that obtained by simulating the impedance spectra increased with the increasing of annealing temperature, demonstrating the growth and the densification of TGO layer.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 510-515
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.510
• Online since: August 2018
• Authors: Zi Yuan Wang, Min Wang, Ya Jie Yuan, Wei Pan*
• Keywords: Impedance Spectroscopy, Thermal Barrier Coating, Thermally Grown Oxides

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