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碳纳米管具有优异的物理性能和力学性能,一直被认为是金属基复合材料的理想增强体,然而,由于细小的碳纳米管之间存在较强的范德华力引起严重的团聚,因此如何制备获得增强体分布均匀的复合材料一直是本研究领域的热点问题。本文分别通过球磨法和异丙醇(IPA)溶液分散法将碳纳米管与镁粉混合,然后采用冷压、烧结制备碳纳米管增强镁基复合材料,采用金相显微镜、SEM、XRD以及硬度计等手段,对比分析了两种混粉方法,质量分数为1%的碳纳米管增强镁基复合材料的微观组织和力学性能。研究结果表明,IPA溶液将碳纳米管均匀地分散在镁颗粒表面,仅有少量团聚;冷压烧结制备获得的复合材料组织致密,碳纳米管分布均匀;XRD结果表明,烧结后的复合材料有少量MgO存在;碳纳米管的加入使纯镁的硬度提高18%。
Carbon nanotubes have been considered as ideal reinforcements for metal matrix composites due to their excellent physical and mechanical properties. However, due to the strong van der Waals forces caused by the strong van der Waals forces between the fine carbon nanotubes, Composite materials with uniform body distribution have always been a hot issue in this research field. In this paper, carbon nanotubes were mixed with magnesium powder by ball milling method and IPA solution dispersion method respectively, then the carbon nanotubes reinforced magnesium matrix composites were prepared by cold pressing and sintering. The microstructure of the composites was characterized by optical microscope, SEM, XRD and hardness Meter and other means, comparative analysis of two mixed powder method, the mass fraction of 1% carbon nanotubes reinforced magnesium matrix composites microstructure and mechanical properties. The results show that the IPA solution uniformly disperses the carbon nanotubes on the surface of the magnesium particles with only a small amount of agglomeration. The composite obtained by cold pressing sintering has a dense structure and uniform distribution of the carbon nanotubes. The XRD results show that the sintered composite has A small amount of MgO exists; the addition of carbon nanotubes increases the hardness of pure magnesium by 18%.