Effect of size and shape of metal particles to improve hardness and electrical properties of carbon nanotube reinforced copper and copper alloy composites
Effect of size and shape of metal particles to improve hardness and electrical properties of carbon nanotube reinforced copper and copper alloy composites
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DOI：
10.1016/j.compscitech.2010.07.012
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发表时间：
2010-12
影响因子：
9.1
通讯作者：
S. M. Uddin;T. Mahmud;Christoph Wolf;Carsten Glanz;I. Kolaric;Christoph Volkmer;H. Höller;Ulrich Wi
中科院分区：
文献类型：
--
作者：
S. M. Uddin;T. Mahmud;Christoph Wolf;Carsten Glanz;I. Kolaric;Christoph Volkmer;H. Höller;Ulrich Wi
利用碳纳米管的特殊性能在金属基复合材料中实现宏观应用仍然是科学技术的一大挑战。由于难以用可升级的工艺将CNT并入金属中，因此很少有成功的尝试用于商业应用。采用粉末冶金热压烧结法制备了碳纳米管增强铜及铜合金（青铜）复合材料。优化了碳纳米管-金属粉末混合和热压烧结工艺参数，并对混合粉末和复合材料的基体材料进行了评价。然而，金属颗粒的形状和尺寸以及碳纳米管的选择对复合材料的力学和电学性能有显着影响。铜基复合材料的硬度比纯铜提高了47%，而青铜复合材料的导电性比纯合金提高了20%。因此，碳纳米管可以改善高导电性低强度铜金属的机械性能，而在低导电性高强度铜合金中，可以改善导电性。
Utilizing the extra-ordinary properties of carbon nanotube (CNT) in metal matrix composite (MMC) for macroscopic applications is still a big challenge for science and technology. Very few successful attempts have been made for commercial applications due to the difficulties incorporating CNTs in metals with up-scalable processes. CNT reinforced copper and copper alloy (bronze) composites have been fabricated by well-established hot-press sintering method of powder metallurgy. The parameters of CNT–metal powder mixing and hot-press sintering have been optimized and the matrix materials of the mixed powders and composites have been evaluated. However, the effect of shape and size of metal particles as well as selection of carbon nanotubes has significant influence on the mechanical and electrical properties of the composites. The hardness of copper matrix composite has improved up to 47% compared to that of pure copper, while the electrical conductivity of bronze composite has improved up to 20% compared to that of the pure alloy. Thus carbon nanotube can improve the mechanical properties of highly-conductive low-strength copper metals, whereas in low-conductivity high-strength copper alloys the electrical conductivity can be improved.