Xiu Ziyang, Ju Boyu, Duan Cungao, Fu Sen, Zhang Ningbo, Mei Yong, Liu Jinming, Feng Yuhan, Yang Wenshu, Kang Pengchao
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China.
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
Materials (Basel). 2021 Dec 24;15(1):130. doi: 10.3390/ma15010130.
Graphene has extremely high theoretical strength and electrothermal properties, and its application to Cu-based composites is expected to achieve a breakthrough in the performance of existing composites. As a nano-reinforced body, graphene often needs a long time of ball milling to make it uniformly dispersed, but the ball milling process inevitably brings damage to the graphene, causing the performance of the composite to deviate from expectations. Therefore, this paper uses CH as a carbon source to repair graphene through a CVD process to prepare low-damage graphene/Cu composites. The process of graphene defect generation was studied through the ball milling process. The effects of defect content and temperature on the graphene repair process were studied separately. The study found that the graphene defect repair process, the decomposition process of oxygen-containing functional groups, and the deposition process of active C atoms existed simultaneously in the CVD process. When the repair temperature was low, the C atom deposition process and the oxygen-containing functional group decomposition process dominated. In addition, when the repair temperature is high, the graphene defect repair process dominated. 3 wt% graphene/Cu composites were prepared by pressure infiltration, and it was found that the bending strength was increased by 48%, the plasticity was also slightly increased, and the thermal conductivity was increased by 10-40%. This research will help reduce graphene defects, improve the intrinsic properties of graphene, and provide theoretical guidance for the regulation of C defects in composites.
石墨烯具有极高的理论强度和电热性能，将其应用于铜基复合材料有望实现现有复合材料性能的突破。作为一种纳米增强体，石墨烯通常需要长时间球磨才能使其均匀分散，但球磨过程不可避免地会对石墨烯造成损伤，导致复合材料性能偏离预期。因此，本文以CH为碳源，通过化学气相沉积（CVD）工艺修复石墨烯，制备低损伤的石墨烯/铜复合材料。通过球磨过程研究了石墨烯缺陷产生的过程。分别研究了缺陷含量和温度对石墨烯修复过程的影响。研究发现，在CVD工艺中，石墨烯缺陷修复过程、含氧官能团分解过程和活性C原子沉积过程同时存在。当修复温度较低时，C原子沉积过程和含氧官能团分解过程占主导。此外，当修复温度较高时，石墨烯缺陷修复过程占主导。通过压力浸渗制备了3 wt%的石墨烯/铜复合材料，发现其弯曲强度提高了48%，塑性也略有提高，热导率提高了10 - 40%。本研究将有助于减少石墨烯缺陷，改善石墨烯的本征性能，并为调控复合材料中的C缺陷提供理论指导。
