石墨烯铝基复合材料的制备及性能分析

采用真空热压烧结工艺制备了石墨烯质量分数分别为0.1%、0.5%和1.0%的添加粘结剂与不加粘结剂的两种6061铝复合材料,对其致密度、硬度和导电性进行了测试分析。结果发现,添加粘结剂的复合材料在石墨烯质量分数为0.1%时就开始出现Al4C3,而不添加粘结剂的复合材料在石墨烯质量分数为0.5%时才开始出现Al4C3,其原因是添加粘结剂的复合材料中的石墨烯先与纳米铝粉混合,使石墨烯更容易与铝发生反应。随着石墨烯质量分数的增加,两种复合材料的致密度和导电性降低,硬度增加。其原因都是随着石墨烯质量分数的增加Al4C3增加,且石墨烯团聚现象也越严重。粘结剂的添加对复合材料的致密度、导电性以及硬度都有较大的影响。

Preparation and Performance of Graphene Reinforced Al Matrix Composites

Graphene/6061Al composites with and without binder were prepared by hot-press sintering process. The mass fraction of graphene of the composites with and without binder are 0.1%, 0.5%, 1.0% respectively. The density, hardness and conductivity of these composites were studied. It is obtained that when the content of graphene is 0.1wt% Al₄C₃ was observed in the composites with binder. While in the composite without binder Al₄C₃ was not observed until the content of graphene reached 0.5wt%. The reason for this phenomenon is that graphene bind with nano-aluminum powder firstly in the composites with binder which made it easier for the graphene to reactive with aluminum. With the increase of the content of graphene, the density and conductivity of the composites were decreased, but the hardness of them was increased which can be explained by the increase of graphene lead to the increase of Al₄C₃, and the agglomeration of graphene was more obvious too. So it can be concluded that the binder has significant effects on the density, conductivity and hardness of the composites.