Enhancement of mechanical properties and conductivity in carbon nanotubes (CNTs)/Cu matrix composite by surface and intratube decoration of CNTs
Enhancement of mechanical properties and conductivity in carbon nanotubes (CNTs)/Cu matrix composite by surface and intratube decoration of CNTs
复制标题
通过CNT的表面和管内装饰增强碳纳米管（CNT）/铜基复合材料的机械性能和导电性
DOI：
10.1016/j.msea.2021.141248
复制
发表时间：
2021
期刊：
影响因子：
6.4
通讯作者：
Yi Jianhong
中科院分区：
文献类型：
--
作者：
Wei Xia;Tao Jingmei;Hu Yong;Liu Yichun;Bao Rui;Li Fengxian;Fang Dong;Li Caiju;Yi Jianhong
碳纳米管增强铜基复合材料的强度和塑性是一对矛盾。碳纳米管的界面和特性是决定铜基复合材料力学性能和导电性能的关键因素。本研究采用了一种新的策略，即通过对碳纳米管的表面和管内修饰来突破上述困境。通过在碳纳米管表面修饰CuO纳米粒子，利用CuO与铜基体良好的润湿性，通过球磨实现了碳纳米管的均匀分散。在最终的复合材料中，CNTs表面的CuO纳米颗粒被还原为Cu。在Cu基体和CNTs之间形成了高密度的界面位错和界面无序区，从而形成了较强的界面结合。通过在碳纳米管内壁上修饰纳米铜颗粒，纳米铜颗粒对碳纳米管内壁的挤压作用提高了碳纳米管与铜基体之间的界面剪切应力。此外，铜填充在管内还可以通过增加其导电截面来降低碳纳米管的管内电阻率。因此，在我们目前的研究中，实现了同时提高强度（272 MPa），塑性（14.3%）和导电率（93.6%IACS）的铜基复合材料。这为解决碳纳米管增强金属基复合材料的强度-塑性和强度-导电性难题提供了一种新的思路。
Strength and ductility are often a paradox in carbon nanotubes (CNTs) reinforced Cu matrix composite, as well as strength and electrical conductivity. Interface and characteristics of CNTs are critical factors in determining the mechanical properties and conductivity of Cu matrix composites. In the present study, a novel tactic by surface and intratube decoration of CNTs is adopted to break the above mentioned dilemmas. By decorating the surface of CNTs with CuO nanoparticles and taking advantage of the good wettability between CuO and Cu matrix, uniform dispersion of CNTs is realized through ball milling. In the final composite, CuO nanoparticles on the surface of CNTs are reduced to Cu. High density interfacial dislocations and interfacial disordered areas are formed between Cu matrix and CNTs, thus forming a strong interfacial bonding. By decorating the inner walls of CNTs with Cu nanoparticles, the interfacial shear stress between Cu matrix and CNTs is improved due to the extrusion effect of Cu nanoparticles on the inner walls. Moreover, the Cu filled inside the tubes can also reduce the intra-tube resistivity of CNTs by increasing their conducting cross-section. Consequently, the Cu matrix composite with simultaneous improvement of strength (272 MPa), ductility (14.3%) and conductivity (93.6% IACS) is achieved in our present study. This tactic provides a new idea to deal with the strength-ductility and strength-conductivity dilemmas in CNTs reinforced metal matrix composites.