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An Evaluation on High Temperature Oxidation Resistance of EB-PVD Thermal Barrier Coatings  

Kim, Jong-H. (Department of Advanced Materials Engineering, Andong National University)
Jeong, Se-I. (Department of Advanced Materials Engineering, Andong National University)
Lee, Ku-H. (Surface Technology Research Center, Korea Institute of Machinery and Materials)
Lee, Eui-Y. (Department of Advanced Materials Engineering, Andong National University)
Publication Information
Journal of the Korean institute of surface engineering / v.39, no.4, 2006 , pp. 147-152 More about this Journal
Abstract
Failure mechanisms of electron beam physical vapor deposited thermal barrier coatings(EB-PVD TBCs) that occur during thermal cyclic oxidation were investigated. The investigations include microstructural degradation of NiCrAIY bond coat, thermally grown oxides(TGOs) along the ceramic top coat-substrate interface and fracture path within TBCs. The microstructural degradation of the bond coat during cyclic oxidation created Al depleted zones, resulting in reduction of NiAl and ${\gamma}$-Ni solid solution phase. It was observed that the fracture took placed primarily within the TGOs or at the interfaces between TGOs and bond coat.
Keywords
Thermal barrier coatings(TBCs); Thermally grown oxides(TGOs); Electron beam-Physical vapor deposition(EB-PVD); Bond coat; Thermal cyclic oxidation;
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