摘要
采用电沉积工艺制备碳纳米管(CNT)均匀分布但铺设方式不同的超顺排碳纳米管(SACNT)薄膜增强铜基层状复合材料。结果表明,当SACNT膜的体积分数为5.0%且正交铺设时,复合材料的抗拉强度和屈服强度最大可达336.3 MPa和246.0 MPa,相比于同种条件下所制备的纯铜,分别提高了74.0%和124.5%。所制备的复合材料的导电性均大于75%IACS。透射电镜分析结果表明,SACNT的加入能细化基体中铜晶粒的尺寸和孪晶片的厚度,并且正交铺设复合材料中的细化效应比单向铺设复合材料中的更显著。Cu/SACNT复合材料的高强度不仅源于SACNT的增强作用,还与CNT铺设方式导致的铜基体晶粒细化有关。
The super-aligned carbon nanotube(SACNT)films reinforced copper(Cu)laminar composites with different orientationsof CNT ply were fabricated by electrodeposition.The results show that the tensile strength and yield strength of cross-ply compositewith5.0%(volume fraction)of SACNT reach maximum of336.3MPa and246.0MPa respectively,increased by74.0%and124.5%compared with pure Cu prepared with the same method.Moreover,the electrical conductivities of all the prepared composites areover75%IACS.The result of TEM analysis shows that the size of Cu grain and the thickness of twin lamellae can be reduced byadding SACNT,and the refining effect in cross-ply composites is more significant than that in unidirectional ply composites.Theenhanced strength of the Cu/SACNT composites comes from not only the reinforcing effect of SACNT films but also the additionalstrengthening of the Cu grain refinement caused by CNT orientation.
作者
帅晶
熊伦乔
朱琳
李文珍
Jing SHUAI;Lun-qiao XIONG;Lin ZHU;Wen-zhen LI(School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, China)
基金
Project(20111080980) supported by the Initiative Scientific Research Program,Tsinghua University,China
Project(2013AA031201) supported by the High Technology Research and Development Program of China
关键词
铜基层状复合材料
超顺排碳纳米管
增强体铺设方式
力学性能
电学性能
显微组织
copper laminar composite
super-aligned carbon nanotubes
reinforcement ply-orientation
mechanical properties
electrical properties
microstructure
