提高碳纳米管(carbon nanotube, CNT)在Cu基体中的分散性以及两者的界面结合,可以有效改善碳纳米管增强Cu基(CNT/Cu)复合材料的性能。本文采用一步水热法在CNT表面原位生成碳化聚合物点(carbonized polymer dot, CPD),对CNT进行表面改性处理,再通过烧结法制备CNT@CPD/Cu复合材料,对复合材料的力学和电学性能进行测试。结果表明：经酸化处理的CNT1表面改性处理后,其结构破坏严重,增强效果减弱。未经酸化处理的CNT2表面改性处理后,CPD负载于CNT2上,不仅保留了CNT的结构完整性,还能显著改善其在基体中的分散性,增强与Cu的结合。此外,CPD和CNT的加入可有效细化Cu晶体,抑制位错运动;CPD和CNT与Cu基体间的“铆钉”界面结合,不仅能降低电子散射效应,还能为电子转移提供额外的通道,从而提升复合材料的电学性能。CNT2@CPD/Cu复合材料的极限抗拉强度相较纯Cu提高了28.9%,电导率为95.9%IACS。该研究结果为开发新型高强高导Cu基复合材料提供了新思路。
Improving the dispersion of carbon nanotubes (CNT) in the Cu matrix and their interfacial bonding can effectively improve the properties of carbon nanotube enhanced Cu-based (CNT/Cu) composite material. This paper employed a one-step hydrothermal method to in situ generate carbonized polymer dots (CPD) on the surface of CNT for surface modification. Subsequently, CNT@CPD/Cu composites were prepared through a sintering process, and the mechanical and electrical properties of the composites were tested. The results indicate that after surface modification treatment, the structure of acid-treated CNT1 is severely damaged, leading to a weakened enhancement effect. In contrast, after surface modification of non-acid-treated CNT2, CPD is loaded onto CNT2, which not only preserves the structural integrity of the CNT but also significantly improves their dispersion in the matrix and enhances the bonding with Cu. Furthermore, the addition of CPD and CNT effectively refines the Cu
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