Oxidation and Crack Nucleation/Growth in an Air-Plasma-Sprayed Thermal Barrier Coating with NiCrAlY Bond Coat

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DOIResolve DOI: http://doi.org/10.1016/j.surfcoat.2004.06.027
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TypeArticle
Journal titleSurface and Coatings Technologies
ISSN0257-8972
Volume197
Issue1
Pages109115; # of pages: 6
SubjectTBC; Bond coat; NiCrAlY; Oxidation; Cracks
AbstractThe oxidation behavior of an air-plasma-sprayed thermal barrier coating (APS-TBC) system was investigated in both air and low-pressure oxygen environments. It was found that mixed oxides, in the form of (Cr,Al)2O3d Ni(Cr,Al)2O4d NiO, formed heterogeneously at a very early stage during oxidation in air, and in the meantime, a layer of predominantly Al2O3 grew rather uniformly along the rest of the ceramic/bond coat interface. The mixed oxides were practically absent in the TBC system when exposed in the low-pressure oxygen environment, where the TBC had a longer life. Through comparison of the microstructures of the APS-TBC exposed in air and low-pressure oxygen environment, it was concluded that the mixed oxides played a detrimental role in causing crack nucleation and growth, reducing the life of the TBC in air. The crack nucleation and growth mechanism in the air-plasma-sprayed TBC is further elucidated with emphasis on the Ni(Cr,Al)2O4 and NiO particles embedded in the chromia.
Publication date
PublisherElsevier Sequoia
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Aerospace Research; NRC Industrial Materials Institute
Peer reviewedYes
NRC number46838
SMPL-2003-0293
NPARC number15936191
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Record identifier45d15a43-7e79-4804-a645-9267d1140e5d
Record created2010-08-17
Record modified2016-05-09
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