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石墨烯/Al 复合材料的显微组织和物理性能研究
Microstructure and Physical Properties of Graphene/Al Composites
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- DOI:
- 作者:
- 李 雷 1，杨南鹏 1，黄 朴 1，许征兵 1，2，3
LI Lei1, YANG Nanpeng1, HUANG Pu1, XU Zhengbing1,2,3
- 作者单位:
- 1.广西大学广西高校高性能结构材料及热表加工重点实验室，广西南宁530004；2.广西大学省部共建特色金属材料与组合结构全寿命安全国家重点实验室，广西 南宁 530004；3. 广西大学 广西生态铝创新协同实验中心，广西 南宁 530004
1. Key Laboratory of High-Performance Structural Materials and Thermo-Surface Processing, Guangxi University, Nanning530004, China; 2. State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, GuangxiUniversity, Nanning 530004, China; 3. Centre of Ecological Collaborative Innovation for Aluminum Industry in Guangxi,Guangxi University, Nanning 530004, China
- 关键词:
- 石墨烯；铝基复合材料；冷压烧结；显微组织；物理性能
graphene; aluminum matrix composite; cold press sintering; microstructure; physical properties
- 摘要:
- 铝基复合材料具有重量轻、高耐蚀性、热膨胀系数低、导电导热性能优异和加工性能优良等优点而成为当前轻金属基复合材料研究的主流，其中，石墨烯/Al 复合材料是目前研究的热点方向。 为了研究石墨烯含量对石墨烯/Al复合材料物理性能的影响，本文采用了冷压烧结法制备了石墨烯质量分数为 0%(纯铝)、0.3%、0.6%和 0.9%的石墨烯/Al复合材料，采用光学显微镜、扫描电子显微镜及其自带的能谱仪分析石墨烯/Al 复合材料的微观形貌及化学成分，采用高精度固体密度仪、显微硬度计、高温 DSC 分析仪和激光导热系数测量仪测试分析石墨烯/Al 复合材料的密度、硬度、比热容、热扩散系数和导热系数，对比分析了不同石墨烯含量对石墨烯/Al 复合材料性能的影响机制。 结果表明，石墨烯/Al 复合材料中石墨烯均匀的分布在铝基体中， 石墨烯的添加能够使基体产生明显的晶粒细化， 当石墨烯含量超过0.6%时，在复合材料中出现石墨烯的团聚现象。 随着石墨烯含量的增加，复合材料的密度和致密度逐渐减小，硬度值呈现先增大后减小的趋势，比热容逐渐降低，热扩散系数先增大后略微减小，导热系数缓慢上升。Aluminum matrix composites have become mainstream in current research on light metal matrix compositesbecause of their advantages, such as light weight, corrosion resistance, low thermal expansion coefficient, excellentelectrical and thermal conductivity and excellent processing properties. Among them, graphene/Al composites are currentlya hot research topic. To investigate the effect of graphene content on the physical properties of graphene/Al composites,graphene/Al composites with graphene mass fractions of 0% (pure aluminium), 0.3%, 0.6% and 0.9% were prepared via thecold press sintering method, and the micromorphology of the graphene/Al composites was analysed using opticalmicroscopy, scanning electron microscopy and X-ray diffractometer. The density, hardness, specific heat capacity, thermaldiffusion coefficient and thermal conductivity of the graphene/Al composites were tested and analysed using ahigh-precision solid densitometer, microhardness tester, high-temperature DSC analyser and laser thermal conductivitymeter (LFA) to compare and analyse the mechanism of the influence of different graphene contents on the properties of thegraphene/Al composites. The results show that the graphene in the graphene/Al composites is uniformly distributed in thealuminium matrix, and the addition of graphene results in obvious grain refinement in the matrix. When the graphenecontent is greater than 0.6 wt.%，the agglomeration of graphene is observed in the composites. With increasing graphenecontent, the density and densification of the graphene/Al composites gradually decrease, the hardness tends to increase andthen decrease, the specific heat capacity gradually decreases, the thermal diffusion coefficient increases and then slightly decreases, and the thermal conductivity slowly increases.