Title: Microstructural evolution of a NiCoCrAlY coating on an IN100 substrate
Authors: Baufeld, Bernd ×
Schmucker, M #
Issue Date: Sep-2005
Publisher: Elsevier science sa
Series Title: Surface & coatings technology vol:199 issue:1 pages:49-56
Abstract: The microstructure of a NiCoCrAlY bond coat (BC) of a thermal barrier coating (TBC) system is investigated in dependence on the heat treatment temperature between 770 and 980 degrees C by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Besides the major gamma and phases, additionally gamma precipitates within the beta phase, alpha-Cr precipitates within the phase, grains of the Cr-rich intermetallic sigma phase and M23X6 phase occur. The gamma' precipitates are observed within the bond coat up to a certain distance from the substrate depending on the temperature. This range decreases with temperature between 920 and 800 degrees C linearly. At higher temperatures, almost no gamma' precipitates are detected. The a-Cr precipitates within the grains are found within all [ grains for heat treatment temperatures below 770 degrees C. For higher temperatures up to 860 degrees C, they exist only within p grains near the substrate and are not proven for temperatures higher than 890 degrees C.
ISSN: 0257-8972
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Materials Engineering - miscellaneous
× corresponding author
# (joint) last author

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