电沉积新型纳米复合MCrAl(Y)涂层的研究进展  

Research Progress of a Novel Nano-composited MCrAl(Y)Coating Prepared by Electrodepostion

作　　者：田礼熙 彭晓 TIAN Li-xi;PENG Xiao(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China;Jiangxi Provincial Engineering Research Center for Surface Technology of Aeronautical Materials,Nanchang 330063,China)

机构地区：[1]南昌航空大学材料科学与工程学院,南昌330063 [2]江西省航空材料表面技术工程中心,南昌330063

出　　处：《表面技术》2022年第9期74-82,共9页Surface Technology

基　　金：江西省自然科学基金重点项目(20181ACB20009)。

摘　　要：热生长保护性CrO膜或AlO膜的MCrAlY涂层,因其与高温金属结构材料的物理相容性好,被广泛用于航空航天等领域的热端结构件的高温防护。目前主要采电子束物理气相沉积、磁控溅射、离子镀、热喷涂等物理方法制备。系统总结了采用纳米复合电沉积技术制备新型纳米复合型MCrAlY涂层的相关研究工作,对其中涉及的纳米复合电沉积和“电泳+电沉积”2种不同的制备方法进行了介绍,概述了基于MCrAl(Y)纳米复合涂层结构特征的选择性氧化模型,阐明了这类涂层相较于传统MCrAlY涂层具有更加优异的抗高温腐蚀性能的“纳米尺寸效应”,重点评述了涂层的组成结构与其高温腐蚀行为之间的关联,以及在此基础上构建的代表涂层成分与表面氧化膜类型关系的涂层氧化图,最后提出了该技术后续可拓展应用于涂层/金属-陶瓷扩散障体系的一体化制备,并对这种新型的纳米复合MCrAlY涂层的未来研究方向与应用前景进行了展望。Owing to a good physical compatibility with high-temperature metallic structural materials, CrO-or AlO-forming MCrAlY coatings have been extensively applied to hot section parts used in aerospace and other fields against high temperature corrosion. Currently, MCr Al Y coatings are manufactured by means of physical methods, including electron beam-physical vapor deposition, magnetron sputtering, ion plating, thermal spray, etc. This review paper introduces a novel nanocomposite-type MCrAl(Y) coating prepared by an electrochemical method of nanocomposite electrodeposition. The microstructure features and high temperature corrosion behaviors of the coatings are discussed.In order to apply CrAl-containing nanoparticles to manufacturing MCrAl(Y) coatings, a nanocomposite electrodeposition method and the further modified "electrophoretic deposition + electrodeposition" method are adopted. The novel MCrAl(Y)coatings exhibit much stronger ability in selected oxidation of Cr or Al compared with the coatings prepared by traditional methods, which can be attributed to the "nanoscale effect" of the dispersed CrAl nanoparticles as well as the "nanocrystal effect" of the nickel matrix. Based on the understanding of the nucleation and growth of CrOor AlO, a selective oxidation model on a basis of the microstructural characteristics of the nanocomposite coatings is outlined, which illustrates the composition determined oxidation processes resulting in formation of different types of oxide scales. By summarizing a large amount of oxidation data of the nanocomposite-type NiCrAl coatings under different oxidation conditions, the oxidation maps are constructed, clearly showing the relationship between the coatings’ composition and the type of the oxides. Moreover, the new "electrophoretic deposition+electrodeposition" method can be further applied to conveniently integrating a metallic-ceramic diffusion barrier into a MCrAl(Y) coatings/Ni-based superalloy system, which can significantly block the interdiffusion between the coating

关 键 词：NICRALY涂层 电沉积 电泳 纳米颗粒 高温腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]