纳米TiO_2在Al_2O_3涂层中的特征及作用机理  

Characteristics and Mechanism Analysis of Nano-sized TiO_2 in Al_2O_3 Coating

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

机构地区：[1]南京航空航天大学江苏省精密与微细制造技术重点实验室,南京210016 [2]南京航空航天大学机电学院,南京210016

出　　处：《材料工程》2009年第12期45-48,共4页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(59975046)

摘　　要：通过扫描电镜、能谱仪、X射线衍射仪分析纳米TiO2在陶瓷材料与NiCoCrAl黏结层激光重熔等离子喷涂结合界面的扩散现象,并对纳米TiO2在陶瓷涂层中的作用机理进行探讨。结果表明:激光重熔过程中,纳米TiO2充当了陶瓷材料增韧介质与导热介质的角色,在起到微裂纹增韧陶瓷材料作用的同时,将激光高能束产生的热量均匀传递给周围Al2O3,并由于自身的熔化而起到黏结相的作用,使陶瓷涂层更加均匀致密;陶瓷材料中的纳米TiO2明显向界面结合侧扩散偏聚并发生化学反应,实现陶瓷涂层与黏结层材料的化学结合。The characteristics of the nano-sized TiO2 in the interface of laser-remelted ceramic material and NiCoCrAl bond coating were investigated by scanning electron microscope （SEM）, energy dispersion spectrometer （EDS）, and X-ray diffraction （XRD）. The action mechanism of nano-sized TiO2 in the ceramic coating was studied as well. The results show that nano-TiO2 act as the medium that increases tenacity and conducts heat for ceramic material. With the micro-cracks increasing tenacity for ceramic material, the nano-sized TiO2 transferred the heat which was generated by high-energy laser beam to its surrounding Al2O3 simultaneous. Owing to its own melting, nano-sized TiO2 acted as bond phase, which made ceramic coating more compact. The nano-sized TiO2 in ceramic materials concentrated to the interface side and reacted with them, which implement chemical bonding between ceramic coating layer and bond coating.

关 键 词：纳米TIO2 激光重熔 等离子喷涂 AL2O3 

分 类 号：TQ153.12[化学工程—电化学工业]