交流阻抗谱法在热障涂层失效研究中的应用

Abstract

Abstract: The application of AC Impedance Spectroscopy (IS) as a non-destructive method on failure evaluation of Thermal Barrier Coatings (TBCs) is introduced . The growth and change of composition of TGO, and the change of microstructure of top coat as function of thermal cyclic test and isothermal test time are investigated by AC IS. It is found that the fitted diameter of modulus and resistance of TGO show parabola relationship with oxidation time. The composition variation of TGO from Al₂O₃ to mixed oxidation can be monitored by analysis IS measured during bond coat oxidation. The resistance of YSZ layer fitted from IS shows that the value skipping from 250 to 350 cycles is caused by microstructure and residual stress in ceramic layer.

Key words: thermal barrier coatings, non-destructive evaluation, impedance spectroscopy, failure analysis

CLC Number:

ZHANG Chun-xia;GONG Sheng-kai;XU Hui-bin. Failure Evaluation of Thermal Barrier Coatings by Impedance Spectroscopy[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2006, 27(3): 520-524.

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Failure Evaluation of Thermal Barrier Coatings by Impedance Spectroscopy

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