Regulating the mechanical properties and electrical conductivity of CNTs/Cu composites by tailoring nano-sized TiC on the surface of intact CNTs
Regulating the mechanical properties and electrical conductivity of CNTs/Cu composites by tailoring nano-sized TiC on the surface of intact CNTs
复制标题
通过在完整 CNT 表面定制纳米 TiC 来调节 CNT/Cu 复合材料的机械性能和电导率
DOI：
10.1016/j.carbon.2021.09.040
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发表时间：
2021-09-25
期刊：
影响因子：
10.9
通讯作者：
Yi, Jianhong
中科院分区：
文献类型：
--
作者：
Liu, Yang;Tao, Jingmei;Yi, Jianhong
碳纳米管（CNTs）增强金属基复合材料（MMCs）的强化效果主要取决于界面结合强度，界面结合强度对复合材料的综合性能具有决定性影响。然而，在碳纳米管增强铜基复合材料中，由于碳纳米管与铜基体之间缺乏润湿性而导致界面结合不良，成为制约碳纳米管载荷传递能力的瓶颈问题。与传统的通过与CNT原位反应生成界面碳化物会导致CNT结构完整性恶化的思路不同，该方法采用了一种新颖的策略，通过预研磨的CNT与Ti粉末之间的固相反应，在完整的CNT表面形成TiC。复合材料的机械性能可以通过调整界面处装饰的 TiC 的形态和数量来调节。特殊设计的界面结构实现了牢固的界面结合，有助于显着提高碳纳米管的强化效率，并有利于铜基体的塑性变形。因此，界面修饰TiC的复合材料实现了拉伸强度（281 MPa）和拉伸伸长率（20.1%）的同时提高，并实现了超高的强化效率（135.8）。我们研究中使用的策略可以为其他CNT/MMC的制备提供参考。 (c) 2021 Elsevier Ltd. 保留所有权利。
Strengthening effect of carbon nanotubes (CNTs) reinforced metal matrix composites (MMCs) mainly depends on the interfacial bonding strength which has a decisive influence on comprehensive properties of the composites. However, in CNTs reinforced Cu matrix composites, poor interface bonding due to the lack of wettability between CNTs and Cu matrix has become a bottleneck problem restricting the load transfer capacity of CNTs. Different from the conventional thoughts of producing interfacial carbides by in-situ reaction with CNTs which will lead to deterioration of structural integrity of CNTs, a novel strategy is used by forming TiC on the surface of intact CNTs through solid phase reaction between the pre-milled CNTs and the Ti powders. The mechanical properties of the composites can be regulated by tailoring the morphology and amount of TiC decorated at the interface. Strong interfacial bonding achieved due to the specially designed interface structure which contributes to the dramatic improvement of strengthening efficiency of CNTs and benefits the plastic deformation of Cu matrix. Consequently, a simultaneous enhancement of tensile strength (281 MPa) and tensile elongation (20.1%) is achieved in the composite with TiC decorated at the interface, and a super high strengthening efficiency (135.8) is realized. The tactic used in our study can provide a reference for the preparation of other CNTs/MMCs. (c) 2021 Elsevier Ltd. All rights reserved.