可控气氛等离子喷涂陶瓷梯度涂层的组织分析  

Microstructure of ceramic gradient coating plasma-sprayed in controlled atmosphere

作　　者：董晓强[1] 罗超[1] 段思华[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2010年第2期146-151,共6页Journal of Shenyang University of Technology

基　　金：沈阳市科技攻关项目(200726164)

摘　　要：针对陶瓷梯度涂层性能优良,在大气氛围下等离子喷涂制备涂层会受到空气氧化这一情况,在可控气氛(Ar气)中采用等离子喷涂的方法制取了Ni-Cr-B-Si/Al2O3的梯度涂层,并且与大气条件下制取的Ni-Cr-B-Si/Al2O3的梯度涂层进行对比.借助扫描电子显微镜(SEM)、x-射线衍射仪(XRD)对涂层的组织分布、相结构进行分析.结果表明:在Ar气和大气中梯度涂层的组织内部都没有明显的界面,实现了组织的连续变化;在Ar气中制取的梯度涂层的组织更加致密,被氧化的程度更低,质量更好.The property of gradient ceramic coating is excellent.However,the coating fabricated with plasma spraying in air is easy to be oxidized.Thus,Ni-Cr-B-Si/Al 2 O3 gradient coating was fabricated with plasma spraying in controlled atmosphere（Ar） ,and was compared with that fabricated in air.The microstructure and phase structure of the gradient coatings were analyzed using scanning electron microscopy（SEM） and x-ray diffractometer（XRD） .The results indicate that no distinct interface can be observed for the gradient coatings plasma-sprayed in both Ar and air,and the consecutive distribution of the microstructure is attained.The microstructure of the gradient coating fabricated in Ar is much denser,and the degree of oxidation is lower.The gradient coating plasma sprayed in Ar has better quality.

关 键 词：可控气氛 等离子喷涂 AL2O3陶瓷 梯度涂层 微观组织 界面 化合物 液滴 

分 类 号：TG174.142[金属学及工艺—金属表面处理]