5052铝合金与PBT的激光直接连接研究  

Research on Laser Direct Jointing of 5052 Aluminum Alloy and PBT

作　　者：刘东雷[1] 刘辉辉 李品[1] 刘会霞[1] Liu Donglei;Liu Huihui;Li Pin;Liu Huixia(School of Mechanical Engineering,Jiangsu University,Zhenjiang Jiangsu212013 China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《中国激光》2021年第22期177-186,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(51275219)。

摘　　要：热塑性聚合物与轻质金属在工业轻量化设计中的连接需求越来越多,激光直接连接技术是实现异质材料连接的重要手段。针对5052铝合金与聚对苯二甲酸丁二醇脂(Polybutylene terephthalate, PBT)激光直接连接存在高反光性与连接强度不高的问题,提出对铝合金的光照上表面进行涂黑处理以提高对激光能量的吸收率,并对铝合金下表面连接处进行局部激光氧化处理以提高铝合金与PBT的激光直接连接强度。分析了激光表面氧化处理对铝合金表面的几何形貌、粗糙度和氧含量的影响,并对激光直接连接机理进行了探究。研究结果表明:氧化处理后的铝合金表面形成了微纳结构,表面粗糙度和氧含量增大,表面润湿性能得到明显改善,氧化处理促进了铝合金与PBT之间的锚固连接;X射线光电子能谱仪(XPS)分析发现,铝合金与PBT之间形成了Al—O—C和Al—C化学键,化学连接有效地提高了连接强度。Objective Light metal and thermoplastic polymer have excellent material properties,and the mixed structure formed by the combination of light metal and thermoplastic polymer can meet the requirements of structural performance and lightweight design in automotive industry and aerospace field.The combined application of these two materials is an important way to improve structural performances and reduce energy consumption,so it can be seen that it is very important to realize the connection between them.Laser direct jointing technology has attracted extensive attention in the industrial sector due to the advantages of high welding efficiency,less defects,and flexibility.In existing studies,there are still some shortcomings of laser direct connecting of metal and polymer.On the one hand,when welding aluminum alloy materials with a high reflection property,most of laser energy is reflected which leads to low energy efficiency,and the reflected light is easy to damage laser optical elements.On the other hand,in order to improve the bonding strength,some scholars have proposed to pretreat the metal material surfaces,but the process is complex,the cost is high,and there is still the problem of chemical reagent pollution.More importantly,the treatment area of the material surface is not easy to control,which influences the appearance and performance of the unconnected area.Laser direct jointing technology has a broad application prospect.We hope that through the research in this paper,one can explore a more efficient,high-quality,low-cost laser direct connection and pretreatment process.Methods The research objects are A5052 aluminum alloy and PBT,which are widely used.Firstly,the upper surface of aluminum alloy is blackened with a black marker,and then the joint of the lower surface of aluminum alloy is oxidized locally by a nanosecond pulse laser.Then,the effect of oxidation power on the surface morphology of aluminum alloy is observed by the scanning electron microscope,and the oxygen content on the surface of alumin

关 键 词：激光技术 激光直接连接 激光表面氧化 氧含量 连接强度 连接机理 

分 类 号：TG456.7[金属学及工艺—焊接]