Al_(2)O_(3)量对2219车铝板上等离子喷涂Ni层组织和摩擦性能的影响  

Effect of Al_(2)O_(3)-Content on Microstructures and Tribological Properties of 2219 Al-Alloy Modified with Plasma Sprayed Ni-Coatings

作　　者：袁荷伟[1] 李高磊[1] 袁黎[2] YUAN Hewei;LI Gaolei;YUAN Li(Henan Vocational and Technical College of Communications,College of Automobile,Zhengzhou 450000,China;Hohai University,College of Civil Engineering and Communications,Nanjing 213022,China)

机构地区：[1]河南交通职业技术学院汽车学院,郑州450000 [2]河海大学土木与交通学院,南京213022

出　　处：《真空科学与技术学报》2021年第2期179-183,共5页Chinese Journal of Vacuum Science and Technology

基　　金：河南省高等学校青年骨干教师培养计划项目(项目编号:2017GGJS242);河南交通职业技术学院校级科研项目(项目编号:2020-YJXM-011)。

摘　　要：将Ni与Al_(2)O_(3)微米颗粒实施混合,再将其通过等离子喷涂方法沉积到2219铝合金表面,控制合适的喷涂工艺参数得到Al_(2)O_(3)/Ni复合涂层,实验测试研究Al_(2)O_(3)量对涂层组织和摩擦性能的影响。研究结果表明:与原始粉末相比,对涂层XRD测试发现形成强度很高的Ni衍射峰,Al_(2)O_(3)相发生了峰强度减小。在涂层内形成了灰色的Ni组织区,Al与Al_(2)O_(3)则呈现黑色的状态。逐渐提高Al_(2)O_(3)加入量后,形成了更多的黑色组织。涂层获得了比2219基体更高的硬度,相对于基体组织提高了3倍以上,提高Al_(2)O_(3)加入量后涂层硬度获得提升。涂层内含有的Al_(2)O_(3)比例提高后,涂层发生了摩擦系数和磨损率降低。当Al_(2)O_(3)含量继续增加后,形成较多氧化物,表现为氧化磨损。随着Al_(2)O_(3)含量的增加,氧化磨损程度表现出增加变化。The surfaces of 2219 Al-alloy,an advanced material in lightweight design of structural parts in automotive and aircraft industries,were modified with the Al_(2)O_(3)-doped Ni-coatings deposited by plasma spraying of Ni and Al_(2)O_(3) micron powders.The influence of the Al_(2)O_(3)-content on the microstructure and tribological behavior of the coating was experimentally studied with X-ray diffraction,scanning electron and conventional mechanical tools The results show that the Al_(2)O_(3)-doping had a major impact.Specifically,the Al_(2)O_(3)-doping significantly increased the hardness up to 3 times higher than that of the substrate at most;as the Al_(2)O_(3)-content increased from 15% to 40%,the hardness increased,accompanied by the decreases of both the wear-rate and friction coefficient,possibly because the "black-spot" area,mainly comprising Al and Al_(2)O_(3),considerably increased.In addition,the oxidative wear was found to be responsible for the wear mechanism.

关 键 词：等离子喷涂 Al_(2)O_(3)/Ni涂层 微观组织 磨损率 

分 类 号：TG174.4[金属学及工艺—金属表面处理]