Abstract Carbon nanotubes reinforced copper matrix (CNT/Cu) composites with high mechanical properties were successfully fabricated by wet mixing and spark plasma sintering (SPS). The effects of CNTs acidification time and CNTs content on the microstructure and mechanical properties of composites were characterized by SEM, FTIR, Raman, HR-TEM and tensile tests. The composites with 24 h acid-treated CNTs (0.5 wt%) and sintered at 837 K had the most optimal mechanical properties, which primarily stemmed from the use of oxygen as an atomic transient agent to form solid Cu-CNT interfacial bonding, the complete densification of the composites and the uniform dispersion of the CNTs. From the density functional calculations, the strong contact mode of Cu2O-CNT is conducive to the improvement of mechanical properties. In addition, the reinforcing effect of surface modification at different acidification times of CNTs was studied and discussed by the strengthening models. This study describes an approach for uniformly dispersing CNTs to enhance the mechanical properties of CNT/Cu composite materials with strong interface bonding and enhancement.

中文翻译：

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碳纳米管酸处理时间对碳纳米管增强铜基复合材料力学性能的影响

摘要 通过湿法混合和放电等离子烧结（SPS）成功制备了具有高机械性能的碳纳米管增强铜基（CNT/Cu）复合材料。通过SEM、FTIR、Raman、HR-TEM和拉伸试验表征了CNTs酸化时间和CNTs含量对复合材料微观结构和力学性能的影响。具有 24 h 酸处理 CNTs (0.5 wt%) 并在 837 K 下烧结的复合材料具有最佳的机械性能，这主要源于使用氧作为原子瞬变剂形成固体 Cu-CNT 界面键合，完整的复合材料的致密化和碳纳米管的均匀分散。从密度泛函计算，Cu2O-CNT的强接触模式有利于力学性能的提高。此外，通过增强模型研究和讨论了CNTs不同酸化时间下表面改性的增强效果。本研究描述了一种均匀分散碳纳米管的方法，以增强碳纳米管/铜复合材料的机械性能，并具有强界面结合和增强功能。