Development of Al-CNT with high strength and electrical conductivity by using low oxygen powder metallurgy process

采用低氧粉末冶金工艺，解决了(1)精细的界面控制和(2)碳纳米管在铝中的均匀分散问题，制备了具有高力学和电学性能的碳纳米管(CNT)复合材料。通过使用裸Al纳米粉末，首先，改善了碳纳米管的团聚，提高了碳纳米管在铝基体中的分散性。其次，制备了无氧化物Al/Al和Al/CNT界面。无氧化物Al/Al界面有助于保持Al的导电性。另一方面，在较低的温度下热处理，在Al/CNT界面形成了非常细小的Al4C3，并形成了无氧化层。均匀分散的细小Al4C3颗粒在不降低Al导电性的前提下，提高了Al-CNTs复合材料的强度。

Al-carbon nanotube(CNT) composites with high mechanical and electrical properties were fabricated by solving (1) Exquisite interfacial control and (2) uniform dispersion of CNTs in Al matrix using low oxygen powder metallurgy process. By using bare Al nanopowder, first, the agglomeration of CNTs was improved and the dispersibility of CNTs was enhanced within the Al matrix. Second, oxide-less Al/Al and Al/CNT interfaces were prepared. oxide-less Al/Al interfaces contributed to preserving the electrical conductivity of Al. On the other hand, very fine Al4C3 were formed at Al/CNT interfaces with oxide-less layer by heat-treatment at much lower temperature. The uniformly dispersed fine Al4C3 particles enhanced the strength of the Al-CNTs composites without degrade of electrical conductivity of Al.