Influence of Heat Treatment on the Bond Coat Cyclic Oxidation Behaviour in an Air-plasma-sprayed Thermal Barrier Coating System

作     者：W.R.Chen X.Wu B.R.Marple P.C.Patnaik 

作者机构：StructuresMaterialsandPropulsionLaboratoryInstituteforAerospaceResearchNationalResearchCouncilCanadaOttawaOntarioCanadaK1AOR6 IndustrialMaterialsInstituteNationalResearchCouncilCanadaBouchervilleQuebecCanadaJ4B6Y4 

出 版 物：《材料热处理学报》 (Transactions of Materials and Heat Treatment)

年 卷 期：2004年第25卷第5B期

页      面：923-929页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0704[理学-天文学] 0702[理学-物理学] 080201[工学-机械制造及其自动化] 

基　　金：Project of Sylvain Belanger of the Industrial Materials Institute of National Research Council Canada They are also grateful to Peter L'Abbe of the Institute for Chemical Process and Environmental Technology of National Research Council Canada for preparing the samples for LPOT treatment The support from the SURFTEC 

主　　题：热处理 TGO TBC 低压氧化 周期性氧化 CoNiCrAlY合金 

摘      要：It is generally believed that a thermally grown oxide (TOO) layer of alumina provides enhanced protection to the metallic bond coat in thermal barrier coating (TBC) systems at elevated temperatures. However, in an air-plasma-sprayed (APS) TBC system with Co-32Ni-21Cr-8Al-0.5Y (wt%) bond coat, the TGO layer formed upon thermal exposure in air was predominantly chromia and spinels, which would not effectively protect the bond coat at above 1000°C. In addition, mixed oxides of chromia, spinel and nickel oxide formed heterogeneously between the ceramic coating and CoNiCrAlY bond coat, which would promote crack initiation and lead to premature TBC failure. A heat treatment in a low-pressure condition was applied to the as-sprayed TBC system, with the aim to produce an alumina layer as well as reduce the amount of detrimental oxides. The influence of this low-pressure oxidation treatment (LPOT) on the bond coat cyclic oxidation behaviour of the TBC system was also investigated.