Quantitative analysis on the depletion rate of β-NiAl phases in MCrAlY coating

From National Research Council Canada

DOIResolve DOI: http://doi.org/10.1007/s12206-013-1118-3
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Name affiliation
  1. National Research Council Canada. Aerospace
TypeArticle
Journal titleJournal of Mechanical Science and Technology
ISSN1738-494X
1976-3824
Volume28
Issue2
Pages513–519
Subjectβ-NiAl depletion; Image analysis; Isothermal aging; TBC(thermal barrier coating); TGO(thermally grown oxide)
Abstract
In this study, a disk-shaped thermal barrier coating system for a gas turbine blade was isothermally aged at 1100°C for various times up to 800 h. The microstructures of the bond coat were observed by using an optical microscope for each aging condition. Diffusion of primary elements consisting of the bond coat was characterized by using electron probe microanalyzer mapping. Semi-quantitative analysis by using scanning electron microscopy energy-dispersive X-ray was insufficient to sense variations in the Al content within the bond coat according to exposure time. An area fraction of β-NiAl phases within the bond coat was calculated by image analysis, and a reasonable approach to estimate time for complete depletion of the Al-rich β-NiAl phase within the bond coat was suggested.
Publication date
PublisherSpringer International Publishing
LanguageEnglish
Peer reviewedYes
Identifier1118
NPARC number23000091
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