激光熔覆Al_2O_3-13% TiO_2陶瓷层制备及其抗热震性能  

Study on Al_2O_3-13% TiO_2 Coatings Prepared by Laser Cladding and Thermal Shock Resistance

作　　者：高雪松[1,2] 田宗军[2] 沈理达[2] 刘志东[2] 黄因慧[2] 

机构地区：[1]东南大学机械工程学院,江苏南京210018 [2]南京航空航天大学机电学院,江苏南京210016

出　　处：《中国激光》2012年第2期85-90,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(50305010);江苏省自然科学基金重点项目(BK2004005)资助课题

摘　　要：利用高频感应辅助激光熔覆技术在镍基高温合金基体上制备了NiCoCrAl-Y2O3黏结层及Al2O3-13%TiO2(质量分数)陶瓷层。通过扫描电镜、能谱仪、X射线衍射仪分析了涂层的微观结构。实验结果表明,在高频感应辅助激光的作用下,基体与黏结层、黏结层与陶瓷层之间的界面均展现了良好的结合特性,具有明显的界面扩散现象。陶瓷层在激光的作用下形成了三维网状结构,该结构使得陶瓷材料中的TiO2材料与Al2O3材料均匀分布,减少了因不同材料聚集所产生的内应力。同时对涂层进行了热震实验,结果证明了利用高频感应辅助激光熔覆技术制备的Al2O3-13%TiO2陶瓷层具有良好的抗热震性能,适合工作于高温环境。NiCoCrAl-Y2O3 and Al2O3-13% TiO2（mass fraction） coatings,formed with means of laser cladding on nickel-based alloy,are heated using high frequency induction sources.The coating and the cross-section are analysed by SEM,XRD,and EDS respectively.The results show that,MCrAlY/Al2O3-13% TiO2 ceramic coating has an excellent chemical combination due to elements obvious diffused in the interface.It is found that Al2O3-rich submicron particles embedded in the TiO2-rich matrix,three-dimensional net structure formed in ceramic coating,which could decrease inner stress between different materials.Meanwhile,thermal shock experiment of samples is tested which shows that Al2O3-13% TiO2 ceramic coating have excellent high temperature property.

关 键 词：激光技术 Al2O3-13%TiO2 激光熔覆 高频感应 微观结构 热震性能 

分 类 号：TQ153.12[化学工程—电化学工业]