等离子喷涂Cu-Al2O3梯度涂层与涂层耐磨性分析  

Abradability of Cu-Al_2O_3 gradient coatings by plasma spraying

作　　者：李高宏[1] 冯拉俊[1] 雷阿利[1] 徐大鹏[1] 

机构地区：[1]西安理工大学材料科学与工程学院

出　　处：《焊接学报》2008年第9期51-54,共4页Transactions of The China Welding Institution

基　　金：陕西省自然科学基金资助项目(2006B22)

摘　　要：利用等离子喷涂法制备了Cu-Al2O3梯度涂层,采用金相显微镜、SEM等手段对涂层进行微观组织结构和磨损后表面形貌分析,用自制销盘式固定磨料磨损试验机,测试了Cu-Al2O3梯度陶瓷涂层的耐磨料磨损性能。结果表明,制备的Cu-Al2O3梯度涂层无明显的组织突变和宏观层间界面,涂层的组织表现出宏观不均匀性和微观连续性分布特征;梯度涂层中当Al2O3含量达到80%时(GC6),涂层的耐磨性最高,约为基体的3倍,随着Al2O3含量继续增大,纯陶瓷涂层(GC7)的耐磨性有所下降;磨损机制随Al2O3含量增大,由犁沟塑变型转变为脆性断裂、剥落型。Cu-Al2O3 gradient coatings were prepared by plasma spray.The microstructure and abraded superficial shape of the coatings were analyzed by metallomicroscopy and SEM.The wear-resisting property of Cu-Al2O3 gradient ceramic coatings was tested by self-produce immobile wearing machine.The results show that the Cu-Al2O3 gradient coatings have not distinct componential saltation and macroscopic interface,and the coatings show the characteristic that structure is not uniform macroscopically but consecutive microscopically.The abradability of the coatings is best when the content of Al2O3 is 80% and the abradability is three times than the substrate.The abradability of pure ceramic coatings decreases as the Al2O3 content increases.The wear mode changed from cutting and ploughing to the hard phase breaking and pull-out.

关 键 词：等离子喷涂 氧化铝陶瓷 梯度涂层 磨料磨损 

分 类 号：TG174[金属学及工艺—金属表面处理]