NiCrAlY(YSZ)多层复合涂层高温抗氧化行为研究  

Cyclic Oxidation Resistance Behavior of Mult-NiCrAlY(YSZ) Coatings

作　　者：刘林涛[1] 李争显[1] 王彦峰[1] 王毅飞[1] Liu Lintao;Li Zhengxian;Wang Yanfeng;Wang Yifei(Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

机构地区：[1]西北有色金属研究院

出　　处：《稀有金属材料与工程》2019年第11期3657-3663,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金青年科学基金项目(51501155)

摘　　要：采用EB-PVD技术在镍基合金Rene N5表面沉积YSZ/NiCrAlY/(NiCrAlY+YSZ)/NiCrAlY/(NiCrAlY+YSZ)多层复合涂层,并对试样进行1000℃不同时间的循环氧化处理,通过SEM、EDS、XRD等方法分析了复合涂层微观组织结构的演变规律及界面反应机制。结果表明:在1000℃条件下,YSZ先驱层会形成双层“三明治”结构的活性扩散障,阻挡基体与涂层之间的元素互扩散;同时,最外层的NiCrAlY+YSZ复合层逐渐转变为以NiO为主混合氧化物层。The YSZ/NiCrAlY/(NiCrAlY+YSZ)/NiCrAlY/(NiCrAlY+YSZ)coatings were prepared on Ni-based single crystal alloy(Rene N5)by electron beam physical vapor deposition(EB-PVD).And the samples were exposed to isothermal oxidation at 1000℃ for 200 h and 500 h.The microstructural evolution behavior and the mechanism of interface reaction were investigated by scanning electron microscopy(SEM),X-ray diffraction(XRD)and energy dispersive spectroscopy(EDS).The results suggest that the YSZ layer can form anα-Al2O3 active diffusion barrier layer with a“sandwich”structure to refuse the interdiffusion between substrate and multi-NY coating.And the multi-NY coating is transformed to mixed oxide layers gradually during the process of cyclic oxidation.

关 键 词：热障涂层 高温抗氧化 界面反应 界面演变 

分 类 号：TG174.44[金属学及工艺—金属表面处理]