Influence of thermal cycle frequency on the TGO growth and cracking behaviors of an APS-TBC

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DOIResolve DOI: http://doi.org/10.1007/s11666-012-9824-4
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TypeArticle
Journal titleJournal of Thermal Spray Technology
ISSN1059-9630
1544-1016
Volume21
Issue6
Pages12941299; # of pages: 6
Subjectcracking, holding time, TBC, TGO growth, thermal cycling
AbstractThe durability of thermal barrier coatings (TBCs) is controlled by fracture near the interface between the ceramic topcoat and the metallic bond coat, where a layer of thermally grown oxide (TGO) forms during service exposure. In the present work, the influence of thermal cycle frequency on the oxidation performance, in terms of TGO growth and cracking behavior, of an air-plasma-sprayed (APS) Co-32Ni-21Cr-8Al-0.5Y (wt.%) bond coat was studied. The results show that while TGO growth exhibited an initial parabolic growth behavior followed by an accelerated growth stage, higher cycle frequency resulted in a faster TGO growth and a higher crack propagation rate. It is found that a power-law relationship exists between the maximum crack length and the TGO thickness, which is independent of the cycle frequency. This relationship may warrant a TBC life prediction methodology based on the maximum crack length criterion.
Publication date
LanguageEnglish
AffiliationAerospace; National Research Council Canada
Peer reviewedYes
Identifier9824
NPARC number21268429
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Record identifier440d428b-f687-4bbd-b592-e5c98a50b1f6
Record created2013-07-11
Record modified2016-05-09
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