机械能助渗法改善Fe-Al-Y2O3纳米复合涂层的高温抗氧化和剥落性  

Improved High Temperature Oxidation Resistance and Spalling Resistance of Fe-Al-Y2O3 Nanocomposite Coatings via Mechanical Energy Assisted Osmosis

作　　者：沈正军 杨柳丽 王枭[1] 于晓华[1] 荣菊[1] 詹肇麟[1] Shen Zhengjun;Yang Liuli;Wang Xiao;Yu Xiaohua;Rong Ju;Zhan Zhaolin(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学材料科学与工程学院

出　　处：《稀有金属》2019年第9期952-958,共7页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51601081);稀贵金属综合利用新技术国家重点实验室开放课题项目(SKL-SPM-2018015)资助

摘　　要：涡轮叶片(以316L不锈钢为例)的高温抗氧化和耐腐蚀性能是影响其服役寿命的关键因素,本工作将纯Al粉和纳米Y2O3粒子高均匀度混合,然后采用机械能助渗法在600℃下制备Fe-Al-Y2O3纳米复合涂层。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、能谱仪(EDS)、 X射线衍射仪(XRD)和原子力显微镜(AFM)等设备研究涂层的微观组织、抗剥落性、高温抗氧化性及内在作用规律。结果表明,机械能助渗法具有提高涂层致密性、细化晶粒和加速Fe, Al原子扩散的作用;复合涂层内的等轴晶结合层由致密均匀的η-Fe2Al5和θ-FeAl3相构成,粒径在20 nm左右,抗剥落性良好。需要注意的是,复合涂层中弥散分布的纳米Y2O3粒子易偏聚在缺陷处,起到钉扎氧化膜的作用,进一步增强氧化皮与基体的粘附性,可助力膜层的高温抗氧化性,其剥落量和氧化增重量能分别降低20%和50%。本研究可为高性能Al2O3防护涂层的制备和改性提供参考。The high temperature oxidation resistance and corrosion resistance of turbine blade(taking 316 L stainless steel as an example) were the key factors affecting its service life. Therefore, Fe-Al-Y2O3 nanocomposite coatings were prepared by mechanical energy assisted osmosis of pure Al powder and nano-Y2O3 particles with high uniformity at 600 ℃. The microstructure, spalling resistance, high temperature oxidation resistance and internal action law of the coating were studied by scanning electron microscope(SEM), transmission electron microscope(TEM), energy dispersive spectrometer(EDS), X-ray diffractometer(XRD) and atomic force microscope(AFM). The results showed that the mechanical energy assisted osmosis method could improve the compactness of the coating, refine the grain and accelerate the atomic diffusion of Fe and Al. The equiaxed crystal bonding layer in the composite coating layer was composed of a dense and uniform η-Fe2Al5 and θ-FeAl3 phase with a particle diameter of 20 nm and good flaking resistance. It should be noted that the dispersed nano-Y2O3 particles in the composite coating were easily segregated at the defects, played the role of pinning the oxide film, further enhanced the adhesion between the oxide scale and the substrate, and could assist the high temperature oxidation resistance of the film layer. The peeling amount and oxidation weight gain of the coating could be reduced by 20% and 50%, respectively. This study could provide a reference for the preparation and modification of high performance Al2O3 protective coatings.

关 键 词：高温抗氧化 Fe-Al-Y2O3涂层 复合涂层 微观组织 机械能助渗法 

分 类 号：TG146[一般工业技术—材料科学与工程]