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Metallographic techniques for evaluation of thermal barrier coatingsThe performance of ceramic thermal barrier coatings is strongly dependent on the amount and shape of the porosity in the coating. Current metallographic techniques do not provide polished surfaces that are adequate for a repeatable interpretation of the coating structures. A technique recently developed at NASA-Lewis for preparation of thermal barrier coating sections combines epoxy impregnation, careful sectioning and polishing, and interference layering to provide previously unobtainable information on processing-induced porosity. In fact, increased contrast and less ambiguous structure developed by the method make automatic quantitative metallography a viable option for characterizing thermal barrier coating structures.
Document ID
19900057814
Document Type
Reprint (Version printed in journal)
Authors
Brindley, William J. (NASA Lewis Research Center Cleveland, OH, United States)
Leonhardt, Todd A. (Sverdrup Technologies, Inc. Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Materials Characterization
Volume: 24
ISSN: 1044-5803
Subject Category
CHEMISTRY AND MATERIALS (GENERAL)
Distribution Limits
Public
Copyright
Other