Optimization of the mechanical properties of CNTs/Cu composite by regulating the size of interfacial TiC
Optimization of the mechanical properties of CNTs/Cu composite by regulating the size of interfacial TiC
复制标题
通过调节界面TiC尺寸优化CNT/Cu复合材料的力学性能
DOI：
10.1016/j.ceramint.2022.05.366
复制
发表时间：
2022-09-15
影响因子：
5.2
通讯作者：
Yi, Jianhong
中科院分区：
文献类型：
--
作者：
Feng, Junqin;Tao, Jingmei;Yi, Jianhong
原位反应生成界面碳化物是提高金属基复合材料界面结合强度和力学性能的有效途径。采用分子水平混合（MLM）结合粉末冶金（PM）的方法制备了碳纳米管（CNTs）增强铜基复合材料，以获得合适尺寸的界面TiC。与传统的粉末冶金相比，MLM法制备的复合粉末中碳纳米管分布均匀，并部分嵌入铜基体中，这是生成纳米级界面TiC的关键因素。TiC纳米颗粒不仅可以牢固地附着在碳纳米管上，而且可以与铜基体形成半共格界面，从而通过桥接它们之间的间隙实现强界面结合。当CNTs含量为0.8vol%时，复合材料的抗拉强度高达364 MPa，增强效率为206，充分发挥了载荷传递作用。该研究为通过引入纳米级界面碳化物来改善CNTs/Cu复合材料的力学性能提供了一个新的视角。
The formation of interfacial carbides by in-situ reaction is a valid way to improve the interfacial bonding strength and mechanical performance of metal matrix composites. In this study, Cu matrix composites reinforced by carbon nanotubes (CNTs) were fabricated by molecular level mixing (MLM) combined with subsequent powder metallurgy (PM) to obtain the interfacial TiC with suitable size. In contrast to typical PM, CNTs were homogeneously distributed and partially incorporated in Cu matrix in the composite powders prepared by MLM, which was a critical factor in generating nanoscale interfacial TiC. The TiC nanoparticles can not only adhere firmly to CNTs, but also form semi-coherent interfaces with Cu matrix, thus achieving strong interface bonding by bridging the gaps between them. The ultimate tensile strength of the prepared composite is as high as 364 MPa with a CNTs content of 0.8 vol% and a noticeable strengthening efficiency of 206, which is considered to be the full exertion of load-transfer. This work can provide a novel perspective for the fabrication of CNTs/Cu composites by introducing nanosized interfacial carbides to improve the mechanical properties.