Development of Nondestructive Evaluation Methods for Ceramic Coatings
W. A. Ellingson, R. J. Visher, M. D. Shields
Argonne National Laboratory
abstract:Nondestructive evaluation (NDE) methods are being developed for use with ceramic coatings for components in the hot-gas path of advanced gas-fired turbine engines with low emissions. The main coatings studied are thermal barrier coatings (TBCs), for vanes, blades, and combustor liners to allow hotter gas-path temperatures. The NDE methods will be used to a) provide data to assess the reliability of new coating application processes, b) identify defective components that could cause unscheduled outages, c) track growth rates of delaminations and defects during use in engines, and d) provide data for reaching rational decisions for replace/repair/re-use of components.
keywords:TBCs; EB-PVD; thermal barrier
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