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Evaluation of TGO growth in thermal barrier coatings using impedance spectroscopy

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Abstract

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 Na2SO4 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 Al2O3. However, the TGO after hot corrosion changes gradually from Al2O3 to a mixture of NiO, Al2O3 and Ni(Cr, Al)2O4 spinel. The thickness of the continuous alumina layer formed in TBCs can be evaluated by electrical modulus spectra.

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References

  1. Padture N. P., Gell M., and Jordan E. H., Thermal barrier coatings for gas turbine engine applications, Science, 2002, 296: 280.

    Article  CAS  Google Scholar 

  2. Stringer J., Coatings in the electricity supply industry: past, present, and opportunities for the future, Surf. Coat. Technol., 1998, 108–109: 1.

    Article  Google Scholar 

  3. Jones R. L., Some aspects of the hot corrosion of thermal barrier coatings, J. Therm. Spray Technol., 1997, 6(1): 77.

    Article  CAS  Google Scholar 

  4. Jiang S. M., Xu C. Z., Li H. Q., Ma J., Gong J., and Sun C., High temperature corrosion behavior of a gradient NiCo-CrAlYSi coating II: Oxidation and hot corrosion, Corros. Sci., 2010, 52: 2316.

    Article  CAS  Google Scholar 

  5. Harada S., Ikeda Y., and Mizuta Y., The inspection of delaminated defects in ZrO2 coated material by infrared thermography techniques, [in] Proceedings of the Int. Symposium on Thermographic NDT and E Techniques Symposium, 1995: 47.

  6. Ma X.Q., and Takemoto M., Quantitative acoustic emission analysis of plasma sprayed thermal barrier coatings subjected to thermal shock tests, Mater. Sci. Eng. A, 2001, 308(1–2): 101.

    Google Scholar 

  7. Kucuk A., Berndt C.C., Senturk U., and Lima R.S., Influence of plasma spray parameters on mechanical properties of yttria stabilized zirconia coatings. II: Acoustic emission response, Mater. Sci. Eng. A, 2000, 284(1–2): 41.

    Google Scholar 

  8. Kazuhiro Ogawa, Dorian Minkova, Tetsuo Shojia, Minoru Satob, and Hideo Hashimoto, NDE of degradation of thermal barrier coating by means of impedance spectroscopy, NDT&E International, 1999, 32(3): 177.

    Article  CAS  Google Scholar 

  9. Song S., and Xiao P., Microstructural evolution of the oxide film formed during high temperature oxidation of nickel evaluated by means of impedance spectroscopy, Scr. Mate., 2001, 44(4): 601.

    Article  CAS  Google Scholar 

  10. Anderson P. S., Wang X., and Xiao P., Effect of isothermal heat treatment on plasma-sprayed yttria stabilized zirconia studied by impedance spectroscopy, J. Am. Ceram. Soc., 2005, 88: 324.

    Article  CAS  Google Scholar 

  11. Yang Fan, and Xiao Ping, Nondestructive evaluation of thermal barrier coatings using impedance spectroscopy, J. Appl. Ceram. Technol., 2009, 6(3): 381.

    Article  CAS  Google Scholar 

  12. Jayaraj B., Vishweswaraiah S., Desai V.H., and Sohn Y.H., Electrochemical impedance spectroscopy of thermal barrier coatings as a function of isothermal and cyclic thermal exposure, Surf. Coat. Technol., 2004, 117–178: 140.

    Article  Google Scholar 

  13. Wang Xin, Mei Junfa, and Xiao Ping, Non-destructive evaluation of thermal barrier coatings using impedance spectroscopy, J. Euro. Ceram. Soc., 2001, 21(7): 855.

    Article  CAS  Google Scholar 

  14. Kingery W. D., Bowen H. K., and Uhlmann D. R., Introduction to Ceramics, 2nd Ed., John Wiley & Sons, New York, 1976: 847.

    Google Scholar 

  15. Patterson J. W., Conduction domains for solid electrolytes, J. Electrochem. Soc., 1971, 118: 1033.

    Article  CAS  Google Scholar 

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Correspondence to Chungen Zhou.

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Huang, H., Liu, C., Ni, L. et al. Evaluation of TGO growth in thermal barrier coatings using impedance spectroscopy. Rare Metals 30 (Suppl 1), 643–646 (2011). https://doi.org/10.1007/s12598-011-0363-z

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  • DOI: https://doi.org/10.1007/s12598-011-0363-z

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