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

From National Research Council Canada

Download	View accepted manuscript: Oxidation and crack nucleation/growth in an air-plasma-sprayed thermal barrier coating with NiCrAlY bond coat (PDF, 636 KiB)
DOI	Resolve DOI: https://doi.org/10.1016/j.surfcoat.2004.06.027
Author	Search for: Chen, W. R.¹; Search for: Wu, Xijia¹; Search for: Marple, B. R.²; Search for: Patnaik, P. C.¹
Affiliation	National Research Council of Canada. NRC Institute for Aerospace Research National Research Council of Canada. NRC Industrial Materials Institute
Format	Text, Article
Subject	TBC; bond coat; NiCrAlY; oxidation; cracks
Abstract	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.
Publication date	2005-07-01
Publisher	Elsevier Sequoia
Place	Lausanne, Switzerland
In	Surface & Coatings Technology 197, no. 1 (1 July 2005): 109–115.
Language	English
Peer reviewed	Yes
NRC number	NRCC 46838 SMPL-2003-0293
NPARC number	15936191
Export citation	Export as RIS
Report a correction	Report a correction (opens in a new tab)
Record identifier	45d15a43-7e79-4804-a645-9267d1140e5d
Record created	2010-08-17
Record modified	2020-12-16

Date modified:: 2024-09-28