Design of an efficient flake powder metallurgy route to fabricate CNT/6061Al composites
Design of an efficient flake powder metallurgy route to fabricate CNT/6061Al composites
复制标题
设计高效片状粉末冶金路线来制造 CNT/6061Al 复合材料
DOI：
10.1016/j.matdes.2018.01.044
复制
发表时间：
2018-03-15
影响因子：
8.4
通讯作者：
Zhang, Di
中科院分区：
文献类型：
--
作者：
Chen, Malin;Fan, Genlian;Zhang, Di
采用高剪切预分散与变速球磨相结合的片状粉末冶金工艺制备了碳纳米管增强铝基复合材料。为了减轻球磨的分散责任，提高分散效率，首先对碳纳米管和6061 Al粉末混合物进行几分钟的高剪切预分散工艺，利用干颗粒包覆机理，使碳纳米管团聚并均匀包覆在6061 Al粉末表面。结果表明，对于预分散粉末，在随后的变速球磨过程中，碳纳米管的分散更加迅速和均匀，从而保护了碳纳米管免受额外的损伤，并导致更好的界面结合和更高的增强效率。结果表明，与未预分散的材料相比，1.5wt%CNT/6061 Al复合材料的弹性模量、拉伸强度和延展性同时得到提高。(c)2018爱思唯尔有限公司版权所有。
A flake powder metallurgy route that combines high-shear pre-dispersion process with shift-speed ball milling was designed to fabricate carbon nanotube reinforced aluminum composites. In order to mitigate the dispersion responsibility of ball milling and improve the dispersion efficiency, high-shear pre-dispersion process utilizing the mechanism of dry particle coating was firstly applied to CNTs and 6061Al powder mixtures for a few minutes to de-agglomerate CNTs and uniformly coat them onto surface of 6061Al powder. It was demonstrated that, for the pre-dispersed powders, more rapid and uniform dispersion of CNTs was achieved during following shift-speed ball milling process, which in turn protected CNTs from additional damage and led to better interfacial bonding and higher reinforcing efficiency. As results, compared to counterpart without pre-dispersion, the as-extruded bulk 1.5 wt% CNT/6061Al composites exhibited simultaneous enhancement in Young's modulus, tensile strength and ductility. (c) 2018 Elsevier Ltd. All rights reserved.