NONDESTRUCTIVE IMPEDANCE SPECTROSCOPY EVALUATION OF THE BOND COAT OXIDATION IN THERMAL BARRIER COATINGS

L. Yang, Y. C. Zhou (), W. G. Mao and Q. X. Liu
Additional contact information
L. Yang: Key Laboratory of Low Dimensional Materials & Application Technology, Ministry of Education, Xiangtan University, Xiangtan, Hunan 411105, China;
Y. C. Zhou: Key Laboratory of Low Dimensional Materials & Application Technology, Ministry of Education, Xiangtan University, Xiangtan, Hunan 411105, China;
W. G. Mao: Key Laboratory of Low Dimensional Materials & Application Technology, Ministry of Education, Xiangtan University, Xiangtan, Hunan 411105, China;
Q. X. Liu: Key Laboratory of Low Dimensional Materials & Application Technology, Ministry of Education, Xiangtan University, Xiangtan, Hunan 411105, China;

Surface Review and Letters (SRL), 2007, vol. 14, issue 05, 935-943

Abstract: In this paper, the impedance spectroscopy technique was employed to examine nondestructively the isothermal oxidation of air plasma sprayed (APS) thermal barrier coatings (TBCs) in air at 800°C. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) were also used to characterize the microstructure evolution of TBCs. After oxidation, the thermally grown oxide (TGO), which was mainly composed of alumina as confirmed by EDX, formed at the upper ceramic coat/bond coat interface, the lower bond coat/substrate interface, and the bond coat. Impedance diagrams obtained from impedance measurements at room temperature were analyzed according to the equivalent circuit model proposed for the TBCs. Various observed electrical responses relating to the growth of oxides and the sintering of YSZ were explained by simulating the impedance spectra of the TBCs.

Keywords: Impedance spectroscopy; air plasma sprayed thermal barrier coatings; NiCrAlYbond coat; oxidation (search for similar items in EconPapers)
Date: 2007
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.worldscientific.com/doi/abs/10.1142/S0218625X07010494
Access to full text is restricted to subscribers

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:wsi:srlxxx:v:14:y:2007:i:05:n:s0218625x07010494

Ordering information: This journal article can be ordered from

DOI: 10.1142/S0218625X07010494

Access Statistics for this article

Surface Review and Letters (SRL) is currently edited by S Y Tong

More articles in Surface Review and Letters (SRL) from World Scientific Publishing Co. Pte. Ltd.
Bibliographic data for series maintained by Tai Tone Lim ().