Journal
SURFACE & COATINGS TECHNOLOGY
Volume 190, Issue 1, Pages 98-109Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2004.06.019
Keywords
impedance spectroscopy; porosity; thickness; plasma spraying; zirconium oxide; thermal barrier coating
Ask authors/readers for more resources
An equivalent circuit of electrochemical impedance spectroscopy (EIS) was suggested to model the morphological structure of nonexposure thermal barrier coating (TBC). The morphological properties of as-coated air plasma sprayed (APS) TBC were correlated with the EIS parameters. A linear relationship between TBC topcoat thickness, D-c, and ceramic resistance, R-c, has been found particularly When the TBC have the same porosity. The TBC porosity, P, shows to be a function of ceramic thickness, D-c, and porosity, P; in particular, it shows a proportional relationship with ceramic capacitance, C-c, when ceramic thickness, D-c, is kept unchanged. The pore size and shape in the TBC topcoat can be assessed by the pore resistance, R-p, as measured by EIS. The results indicate that electrochemical impedance spectroscopy can be used for quality assurance of TBC and, in particular, to evaluate TBC ceramic topcoat thickness, porosity and kinds of defects. (C) 2004 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available