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Impedance spectroscopy was employed to evaluation of TGO growth on the interface of YSZ/bond coat in plasma sprayed thermal barrier coatings during isothermal oxidation and exposed to Na 2 SO 4 at 950 °C. Various observed electrical responses relating to the thickness, continuous nature and purity of the TGO layer were explained using an equivalent circuit model. The results show the thickness of TGO increases with exposure time. The TGO after isothermal oxidation mainly contains Al 2 O 3 . However, the TGO after hot corrosion changes gradually from Al 2 O 3 to a mixture of NiO, Al 2 O 3 and Ni(Cr, Al) 2 O 4 spinel. The thickness of the continuous alumina layer formed in TBCs can be evaluated by electrical modulus spectra.
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Huang et al. (2011) studied this question.
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