涂布刮刀表面等离子喷涂纳米Al_2O_3-13%TiO_2涂层的特性  

Performance of Alumina-13%Titania Nanostructured Coating Prepared on Coating Blade Surface by Plasma Spraying

作　　者：毕恩兵[1] 孙宏飞[1] 高鹏[1] 李冲[1] 郭娜娜[1] 牛占蕊[1] 李艳[2] 

机构地区：[1]山东科技大学材料科学与工程学院,山东青岛266510 [2]西南大学教育学院,重庆400715

出　　处：《材料保护》2011年第11期5-8,6,共4页Materials Protection

基　　金：山东省科技发展计划项目(2009GG10003018)

摘　　要：为了深入研究纳米Al_2O_3-13%TiO_2(AT13)涂层的组织、性能与喷涂工艺参数之间的关系,采用正交试验法对等离子喷涂工艺的电流、电压、送粉率和喷涂距离等参数进行了优化,在涂布刮刀表面制备了纳米AT13涂层。采用金相显微镜,SEM,EPMA和XRD等对纳米AT13涂层的组织、磨粒磨损性能和结合强度进行了分析。结果表明:纳米AT13涂层均匀致密,孔隙率低;涂层存在全熔和半熔双态结构特征,相结构明显,以稳定相α-Al_2O_3和Rutile-TiO_2为主,存在亚稳态γ-Al_2O_3相结构转变;涂层与基体以机械结合为主,结合强,耐磨性良好;涂层表面应力以残余压应力为主。Orthogonal tests were conducted to optimize the parameters including current,voltage,feeding rate of powder and spraying distance for preparing nanometer Al_2O_3- 13%TiO_2 (AT13) composite coating via plasma spraying.Based on the optimization test results,desired nanometer AT13 composite coating was fabricated on the surface of coating blade.A metallographic microscope,a scanning electron microscope,an electron probe micro - analyzer and an X - ray diffractometer were performed to analyze the morphology,microstructure,adhesion to substrate and crystal structure of as - sprayed ceramic composite coating. The abrasive wear resistance of the coating was also evaluated. Results indicate that as - sprayed AT13 coating is uniform and compact and has a low porosity.The coating was dominated by bi-modal distribution of completely melted ingredients and halfmelted ingredients,containing stable a - Al_2O_3 and rutile TiO_2 as the major phases and a small amount of metastableγ-Al_2 O_3 as well.In the meantime,as - sprayed AT13 coating was well mechanically combined with the substrate and dominated by residual compressive stress,showing good abrasive wear resistance.

关 键 词：等离子喷涂 Al_2O_3-13%TiO_2 陶瓷涂层 纳米结构 残余应力 磨粒磨损 双态分布 

分 类 号：TB383.1[一般工业技术—材料科学与工程]