浮动催化法制备碳纳米管纱线的结构及弯曲疲劳性能  

The Structure and Bending Fatigue Performance of Carbon Nanotube Yarn Produced by the Floating Catalytic Method

作　　者：史晶晶[1] 杨恩龙[1] Shi Jingjing;Yang Enlong(College of Materials and Textile Engineering,Jiaxing University,Jiaxing,Zhejiang 314001)

机构地区：[1]嘉兴学院材料与纺织工程学院,浙江嘉兴314001

出　　处：《嘉兴学院学报》2023年第6期100-104,共5页Journal of Jiaxing University

基　　金：教育部产学合作协同育人项目(220502054265747,220502054163039);浙江省自然科学基金项目(LY18E030004)。

摘　　要：针对采用浮动催化法制备碳纳米管纱线的机载导线需承受长期高频力学负荷的问题,探索了纱线的结构、纱线弯曲疲劳后裂纹、不同疲劳次数后纱线的残余断裂强力及纱线疲劳后拉伸的断面情况.结果表明,浮动催化法制备的碳纳米管纱线表面有浅沟槽,内部呈层状结构;弯曲角度和预加张力越大疲劳寿命越小;纱线疲劳后表面沟槽变深并在弯曲点外侧形变最大处产生垂直于纱线轴向的裂纹;随着疲劳次数的增加,纱线残余断裂强力先迅速降低,随后降低速度减慢;疲劳后拉伸的纱线断裂面呈榫卯状且榫头偏向一边,表明纱线内部的层状结构能有效阻止弯曲疲劳裂纹的扩展.研究结果可用于碳纳米管纱线结构的优化和安全应用.The airborne conductor of carbon nanotube yarn produced by the floating catalytic method has to withstand long-term and high-frequency mechanical loads.To solve this problem,the structure of the yarn,its crack after bending fatigue,its residual breaking strength after different fatigue times,and its fracture surface after fatigue are investigated.The results show that the carbon nanotube yarn produced by the floating catalytic method has shallow grooves on the surface and a layered structure inside.The greater the bending angle and the pre-tension are,the shorter the fatigue life is.The surface groove of the yarn becomes deeper after fatigue.Cracks perpendicular to the axial direction of the yarn are generated at the outer side of the bending point where the deformation is the largest.As the fatigue times increase,the residual breaking strength of the yarn decreases rapidly at first,and then the rate of decrease slows down.The fracture surface of the stretched yarn after fatigue is tenon-and-mortise-shaped with the tenon leaning to one side,indicating that the layered structure inside the yarn can effectively prevent the crack expansion during bending fatigue.The research results can be used for structure optimization of carbon nanotube yarn and safety applications.

关 键 词：浮动催化法 碳纳米管纱线 结构 弯曲疲劳性能 断裂强力 

分 类 号：TB383[一般工业技术—材料科学与工程]