Fabrication of Al-CNT composite with high hardness and electrical conductivity by controlling Al4C3 formation
Fabrication of Al-CNT composite with high hardness and electrical conductivity by controlling Al4C3 formation
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DOI：
10.1016/j.jallcom.2023.169102
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发表时间：
2023-02-01
影响因子：
6.2
通讯作者：
Kobashi，Makoto
中科院分区：
文献类型：
--
作者：
Kim，Dasom;Hirayama，Yusuke;Kobashi，Makoto
以裸Al纳米粉为基体，制备了硬度为1.4GPa、电导率为1.52 × 107 S/m的Al-碳纳米管（CNT）复合材料。使用裸Al纳米粉末，（1）由于Al纳米粉末的尺寸与CNT的尺寸相似，可以实现高度分散的CNT，以及（2）由于Al颗粒表面上的较少氧化物层，可以控制Al和CNT之间的界面（Al/CNT界面）。在663 K的低温退火条件下，在Al/CNT界面处形成了细小的Al 4C 3晶粒，提高了Al-CNT的硬度，而剩余的Al/Al界面氧化层较少，保持了导电性。总之，本研究中制备的Al-CNT复合材料克服了先前报道的Al-纳米碳的硬度和导电性之间的权衡关系。在本研究中，Al-CNT复合材料的导电性比具有相同硬度水平的Al-纳米碳高33倍。
In this study, an Al-carbon nanotube (CNT) composite with a high hardness of 1.4 GPa and an electrical conductivity of 1.52 × 107S/m is achieved simultaneously using bare Al nanopowder as a metal matrix. Using bare Al nanopowder, (1) highly dispersed CNTs can be realized because the size of the Al nanopowder is similar to that of the CNTs, and (2) the interface between Al and CNT (Al/CNT interface) can be controlled because of the less oxide layers on the Al particle surface. In particular, fine Al4C3grains are formed at the Al/CNT interface via annealing at a low temperature of 663 K, which enhances the hardness of the Al-CNT, whereas the remaining Al/Al interface with less oxide layers preserves the electrical conductivity. In conclusion, the Al-CNT composites prepared in this study overcome the trade-off relationship between the hardness and electrical conductivity of the previously reported Al-nanocarbons. The electrical conductivity of the Al-CNT composites in this study is 33 times higher than that of Al-nanocarbons with the same hardness level.