CFRP表面激光熔覆TC4+AlSi10Mg复合涂层的组织与性能  

Microstructural characteristics and property of laser cladded TC4+AlSi10Mg composite coating on the CFRP surface

作　　者：陶汪[1] 苏轩[1] 陈曦[1] 陈彦宾[1] TAO Wang;SU Xuan;CHEN Xi;CHEN Yanbin(State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,150001,China)

机构地区：[1]哈尔滨工业大学,先进焊接与连接国家重点实验室,哈尔滨150001

出　　处：《焊接学报》2020年第5期30-35,I0002,共7页Transactions of The China Welding Institution

基　　金：中央高校基本科研业务费专项资金资助(HIT.NSRIF.2017003)。

摘　　要：采用激光熔覆技术在碳纤维增强热塑性塑料(carbon fiber reinforced thermoplastics,CFRP)表面成功地制备了TC4+AlSi10Mg复合涂层.通过扫描电镜、能谱仪和透射电镜分析了TC4+AlSi10Mg复合涂层与CFRP基体连接的界面层微观结构、元素成分分布及相组成.采用纳米压痕仪对复合涂层到基材的硬度变化规律进行测试.结果表明,通过激光熔覆技术可以快速在CFRP材料表面形成连续的、均匀的TC4+AlSi10Mg复合涂层.TC4+AlSi10Mg复合粉末在激光作用下,受热熔化渗透到CFRP基体内部,形成良好的冶金结合,并在碳纤维-树脂-复合涂层之间形成连续的界面层.TC4+AlSi10Mg复合涂层与CFRP基体连接的界面层相成分为TiC,Ti3Al,TiS2和Ti3AlC相.CFRP基体的平均硬度为10.15 HV,涂层的最高硬度可达1914 HV.基于试验观察和理论分析,得出CFRP表面激光熔覆TC4+AlSi10Mg复合涂层主要的界面反应机理为Ti(s)+C(s)→TiC(s),Al(l)+3Ti(s)→Ti3Al(s).TC4+AlSi10 Mg composite coating was successfully prepared on the surface of carbon fiber reinforced plastics(CFRP)by laser cladding technology.Microstructure,elemental composition and distribution as well as phase composition of the interface layer between the TC4+AlSi10 Mg composite coating and CFRP substrate were analyzed by scanning electron microscopy,energy disperse spectroscopy,and transmission electron microscopy.Hardness was measured by nanoindentor along the vertical direction from the composite coating to the CFRP substrate.Research findings showed that laser cladding technology could be applied to fabricate uniform and continuous TC4 coating on the surface of CFRP substrate.Upon the heat effect of laser cladding,the TC4+AlSi10 Mg composite powder melted and then penetrated into the interior of the CFRP substrate,thus achieving a good metallurgical bonding.Finally,a continuous interface layer formed among carbon fiber,plastics,and composite coating.The interface layer between the TC4+AlSi10 Mg composite coating and CFRP substrate was mainly composed of TiC,Ti3 Al,TiS2,and Ti3 AlC phases.The average hardness of the CFRP substrate was 10.15 HV,while the maximum hardness of the composite coating was 1914 HV.In addition,based on experimental observation and theoretical analysis,the dominant interface reaction mechanism of the laser cladded TC4+AlSi10 Mg composite coating on the CFRP surface can be drawn as follows:Ti(s)+C(s)→TiC(s),Al(1)+3 Ti(s)→Ti3 Al(s).

关 键 词：激光熔覆 CFRP 显微组织 连接机理 

分 类 号：TG453[金属学及工艺—焊接]