Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (39권4호 147-152)

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

전자빔 증착법에 의한 열차폐코팅의 고온 내산화성 평가

김종하;정세일;이구현;이의열;
Kim, Jong-H.;Jeong, Se-I.;Lee, Ku-H.;Lee, Eui-Y.;

안동대학교 신소재공학부;한국기계연구원 재료기술연구소 표면기술연구센터;
Department of Advanced Materials Engineering, Andong National University;Surface Technology Research Center, Korea Institute of Machinery and Materials;

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;