在高温蠕变环境中的热障涂层失效行为

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2005, Vol. 26 ›› Issue (1): 121-124.

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Failure Behavior of Thermal Barrier Coatings in Creep Environment

GAO Yong-shuan, CHEN Li-qiang, GONG Sheng-kai, XU Hui-bin

Department of Material Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

Received:2004-01-12 Revised:2004-05-06 Online:2005-02-25 Published:2005-02-25

Abstract

Abstract: High temperature creep testing is carried out to investigate the high temperature fatigue behavior of ceramic thermal barrier coatings(TBCs) prepared by electron beam- physical vapor deposition(EB-PVD). It has been observed that the cracks are mainly formed in the interface between TGO(Thermally Grown Oxidation) layer and the ceramic top coating, instead of in the TGO layer just often observed during thermal cyclic testing without loading. Such cracks can be considered to be caused by the creep of metallic substrate along loading direction and the shrink in diameter of sample.

Key words: TBCs, EB-PVD, TGO, creep, failure mechanism

CLC Number:

GAO Yong-shuan;CHEN Li-qiang;GONG Sheng-kai;XU Hui-bin. Failure Behavior of Thermal Barrier Coatings in Creep Environment[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2005, 26(1): 121-124.

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Failure Behavior of Thermal Barrier Coatings in Creep Environment

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