铺设方式对超顺排碳纳米管增强铜基层状复合材料显微组织和性能的影响

摘要

The super-aligned carbon nanotube (SACNT) films reinforced copper (Cu) laminar composites with different orientations of CNT ply were fabricated by electrodeposition.The results show that the tensile strength and yield strength of cross-ply composite with 5.0％ (volume fraction) of SACNT reach maximum of 336.3 MPa and 246.0 MPa respectively,increased by 74.0％ and 124.5％ compared with pure Cu prepared with the same method.Moreover,the electrical conductivities of all the prepared composites are over 75％ IACS.The result of TEM analysis shows that the size of Cu grain and the thickness of twin lamellae can be reduced by adding SACNT,and the refining effect in cross-ply composites is more significant than that in unidirectional ply composites.The enhanced strength of the Cu/SACNT composites comes from not only the reinforcing effect of SACNT films but also the additional strengthening of the Cu grain refinement caused by CNT orientation.%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.