AZ31镁合金表面纳米陶瓷涂层的组织与力学性能分析  

Investigation on microstructure and mechanical properties of nano-ceramic coating on AZ31 magnesium alloys

作　　者：高正源[1,2] 潘复生[1,2] 

机构地区：[1]重庆大学国家镁合金材料工程技术研究中心 [2]重庆大学材料科学与工程学院,重庆400044

出　　处：《重庆大学学报（自然科学版）》2012年第7期67-71,共5页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(50725413);国家重大基础研究资助项目(973计划)(2007CB613704);重庆市科委资助项目(2010CSTC-HDLS)

摘　　要：为改善镁合金表面的耐磨性能,采用磁控溅射工艺在AZ31镁合金表面制备了纳米Al203陶瓷涂层。用XRD、SEM-EDS等分析了涂层的结构和形貌,用正交试验讨论了温度、功率、时间对涂层表面硬度的影响规律。结果表明,影响纳米Al2O3膜硬度和耐磨性的因素是溅射功率和溅射时间,最佳的工艺为80℃,200W,3h。采用本工艺技术,材料表面主要为2～10um厚、30nm左右的粒状δ-Al2O3致密层,表层硬度从基体767MPa提高为1 360MPa,提高了77.31%。In order to improve the wear-resisting property of magnesium alloy’s surface coating,Al2O3 nano-ceramic coating on the surface of AZ31 magnesium alloy is prepared using the magnetron sputtering process.Influences of temperature,power and time on hardness of surface layer are discussed by orthogonal method.Morphology,phases and composition of coatings are analyzed by SEM,XRD and EDS.The results show that the time and power are important factors to affect hardness and wear resistance.The process parameters of 80 ℃,200 W and 3 h are the optimal sputtering process.Through this process,the thickness of nano-Al2O3 coating on AZ31 is about 2 to 10 μm and the grain size is about 30 nm.The surface hardness of ceramic coating reaches up to 1 360 MPa,and increases more than 77.31% of the substrate hardness of nano-Al2O3 coating.

关 键 词：镁合金 磁控溅射 纳米陶瓷涂层 硬度 

分 类 号：TG178[金属学及工艺—金属表面处理]