Influence of Re on the Properties of a NiCoCrAlY Coating Alloy

查看全文 作　　者：J.J. [1,2]Liang;H. [1,3]We;Y.L. [1]Zhu;X.F. [1]Sun;Z.Q. [1]Hu;M.S. [3]Dargusch;X.D. [3]Yao

机构地区：[1]Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;[2]Graduate School of Chinese Academy of Sciences, Beijing 100039, China;[3]School of Materials & Mining Engineering, The University of Queensland, QLD 4072, Australia

出　　处：《Journal of Materials Science & Technology》索引2011年第27卷第5期,共7页

基　　金：supported by the National Basic Research Program ('973 Program') of China under grant No. 2010CB631200 (2010CB631206);the National Natural Science Foundation of China (NSFC) under grantNos. 50931004, 51071164, U1037601 and 50671102;the opening fund of State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences 摘　　要：MCrAlY can serve as stand-alone overlay coatings or bond coats in thermal barrier coating systems, and its properties play a vital role in determining the performance of these coating systems. In order to further understand the behavior of MCrAlY coatings, several NiCoCrAlY model alloys with different levels of Re (0.3 wt%, 6 wt%, and 9 wt%) were investigated. Microstructural observation showed the addition of Re promoted the precipitation of Cr-rich phases, such as α-Cr and σ. The presence of α-Cr lowered the coecient of thermal expansion (CTE) of the coating alloys, which could reduce the CTE mismatch at the scale-metal interface. The solid solution strengthening effect of Re is responsible for an increase in Rockwell hardness of the coating alloys. But the isothermal oxidation resistance at 1100oC was deteriorated due to the precipitation of brittle α-Cr phase, a phase of inferior oxidation resistance compared with β-NiAl and γ-Ni. 关键词：涂层系统合金性能 RE 涂料体系耐氧化性热膨胀系数模型合金组织观察

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Influence of Re on the Properties of a NiCoCrAlY Coating Alloy

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