Cyclic Oxidation Behavior of an EB-PVD CoCrAlY Coating Influenced by Substrate/coating Interdiffusion

查看全文 作　　者：LIANG [1,2]Tianquan;GUO [1]Hongbo;PENG [1]Hui;GONG [1]Shengkai

机构地区：[1]School of Materials Science and Engineering, Beihang University, Beijing 100191, China;[2]School of Materials Science and Engineering, Guangxi University, Nanning 530004, China

出　　处：《Chinese Journal of Aeronautics》索引2012年第25卷第5期,共8页

基　　金：National Natural Science Foundation of China (50731001, 51071013, 51001032);National Basic Research Program of China (2010CB631200) 摘　　要：To reveal the influence of substrate/coating interdiffusion on the cyclic oxidation property of a metallic coating, cyclic oxidation behavior of an EB-PVD CoCrAlY coating on directionally solidified Ni-based superalloy DZ125 at 1 050 oC is investigated. The 40 μm thick CoCrAlY coating has a cyclic oxidation life of around 160 h, and the oxidation constant is 1.915× 10.7 mg4·cm.8·s.1. However, severe spallation of the oxides containing Co, Cr, Ni, Ta and Ti occurs with longer cyclic oxidation. The degradation in oxidation resistance for the coating is related to the depletion of Al due to the oxide spallation and interdiffusion. Severe interdiffusion between the coating and underlying substrate occurs at 1 050 oC. The composition of the substrate has an important effect on the thermal cycling lifetime of the coating. The influencing mechanism is discussed. 关键词：EB-PVD 金属涂层氧化行为循环氧化内扩散 NI基高温合金基体热循环寿命

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Cyclic Oxidation Behavior of an EB-PVD CoCrAlY Coating Influenced by Substrate/coating Interdiffusion

参考文献(36)

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