【作者】 张强； 杨冠军； 李成新； 李长久；

【Author】 Qiang Zhang Guan-Jun Yang Cheng-Xin Li Chang-Jiu li (State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an,710049,China)

【机构】 西安交通大学金属材料强度国家重点实验室材料科学与工程学院；

【摘要】 采用冷喷涂技术在镍基高温合金基体（Inconel738）上沉积纳米结构NiCrAlY涂层,通过扫描电镜与能谱分析、X射线衍射,研究了在保护气氛下热处理温度对氧化膜组织结构及成分的影响。结果表明,在惰性Ar保护气氛下,经900℃处理后,涂层表面局部生成针状α-Al₂O₃。在1000℃以上热处理后,涂层表面生成的球状的α-Al₂O₃,氧化膜均匀连续覆盖在涂层表面,但局部较厚的氧化膜呈现双层结构,外层为Cr₂ O₃或尖晶石氧化物,内层为α-Al₂O₃且连续均匀。更多还原

【Abstract】 Nanosructured NiCrAlY coating was deposited on Inconel 738 super-alloy substrate by cold spraying.The growth characteristic of oxides of nanostructured NiCrAlY coat deposited by cold spray in a Ar atomosphere was investiga- ted using scanning electron microscopes（SEM）with an energy dispersive spectrometer（EDS）and X-ray diffraction anal- ysis.It was founded that the needle-likeα-Al₂O₃ was formed at 900℃Cunder Ar atmosphere.The equiaxedα-Al₂O₃ was formed on the surface of NiCrAlY at a temperature of above 1000℃.At above 1100℃,oxide becomes continuous and u- niform,and thick TGO was composed of two subscales with the external Cr₂O₃ and spinel and the uniformly and continu- ously innerα-Al₂O₃.更多还原