Xu Jilei, Zhang Yizhuang, Li Zhiyuan, Ding Yunpeng, Zhao Xin, Zhang Xinfang, Wang Hanying, Liu Changhong, Guo Xiaoqin
School of Materials, Zhengzhou University of Aeronautics, Zhengzhou 450046, China.
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450046, China.
Nanomaterials (Basel). 2022 Dec 14;12(24):4446. doi: 10.3390/nano12244446.
The dispersion of carbon nanotubes (CNTs) is the bottleneck in CNT-reinforced metal matrix composites. In this work, CNT/Mg composites were prepared by grinding Mg powder and then dispersing CNTs via ball milling and hot pressing. The uniform distribution of Ni-coated CNTs in the matrix was achieved by optimizing the content of CNTs. Scanning electron microscope, high-resolution transmission electron microscopy and X-ray diffraction, optical microscopy, and compression tests were employed. With the CNT content being less than 1%, the CNTs can be evenly distributed in CNT/Mg composites, resulting in a sharp increase in strength. However, with the higher CNT content, the CNTs gradually cluster, leading decreased fracture strain and strength. Furthermore, the coated Ni in the CNTs reacts with the magnesium matrix and completely transforms into MgNi, significantly enhancing the interface bonding. This strong interface bonding and the diffusely distributed MgNi in the matrix significantly strengthen the CNT/Mg composite.
碳纳米管（CNTs）的分散是碳纳米管增强金属基复合材料的瓶颈。在这项工作中，通过研磨镁粉，然后通过球磨和热压分散碳纳米管来制备碳纳米管/镁复合材料。通过优化碳纳米管的含量，实现了镀镍碳纳米管在基体中的均匀分布。采用了扫描电子显微镜、高分辨率透射电子显微镜、X射线衍射、光学显微镜和压缩试验。当碳纳米管含量小于1%时，碳纳米管可以均匀分布在碳纳米管/镁复合材料中，导致强度急剧增加。然而，随着碳纳米管含量的增加，碳纳米管逐渐聚集，导致断裂应变和强度下降。此外，碳纳米管中的镀镍层与镁基体反应并完全转变为MgNi，显著增强了界面结合力。这种强界面结合力以及基体中弥散分布的MgNi显著增强了碳纳米管/镁复合材料的性能。
