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Oxidation and crack nucleation/growth in an air-plasma-sprayed thermal barrier coating with NiCrAlY bond coat

Par Conseil national de recherches du Canada

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DOITrouver le DOI : https://doi.org/10.1016/j.surfcoat.2004.06.027
AuteurRechercher : 1; Rechercher : 1; Rechercher : 2; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada. Institut de recherche aérospatiale du CNRC
  2. Conseil national de recherches du Canada. Institut des matériaux industriels du CNRC
FormatTexte, Article
SujetTBC; bond coat; NiCrAlY; oxidation; cracks
Résumé
The 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.
Date de publication
Maison d’éditionElsevier Sequoia
EmplacementLausanne, Switzerland
Dans
  • Surface & Coatings Technology 197, nº 1 (1 juillet 2005) : 109–115.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCNRCC 46838
SMPL-2003-0293
Numéro NPARC15936191
Exporter la noticeExporter en format RIS
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Identificateur de l’enregistrement45d15a43-7e79-4804-a645-9267d1140e5d
Enregistrement créé2010-08-17
Enregistrement modifié2020-12-16
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