(1. 南昌航空大学 材料科学与工程学院，南昌 330063；
2. 南昌航空大学 无损检测技术教育部重点实验室，南昌 330063；
3. 澳大利亚国立大学 工程与计算机技术学院，堪培拉 2601)
摘 要: 采用乙醇溶液分散和球磨两步法将石墨烯和铝粉混合，然后采用冷压和真空热压烧结相结合工艺制备了石墨烯/Al复合材料。利用扫描电镜、X射线衍射、电子万能实验机和显微维氏硬度计等分析了复合粉体混合前后形貌，研究了石墨烯添加量对复合材料微观结构和力学性能的影响。结果表明：采用乙醇溶液分散和球磨两步法，石墨烯均匀分散在铝颗粒基体中，得到混合均匀的复合粉体。冷压-真空热压烧结制备的复合材料组织致密，界面结合良好，石墨烯呈片状均匀地分布在铝基体中。随着石墨烯含量的增加(0.5%~2%，体积分数)，复合材料强度和硬度均逐渐升高；当石墨烯的含量为1%时，复合材料的综合力学性能较好，强度和硬度分别达到199 MPa和82.95 HV，相对纯铝基体的分别增加了99%和113%。
关键字: 石墨烯/Al复合材料；真空热压烧结；微观结构；力学性能
（1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China;
2. Key Laboratory of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University,
Nanchang 330063, China;
3. College of Engineering and Computer Science, Australian National University, Canberra 2601, Australia）
Abstract:Graphene and pure aluminum powders were firstly mixed thoroughly two step methods, namely ethanol solution dispersion and ball milling. Then, the cold pressing and vacuum hot pressing sintering combination process were applied to fabricate graphene/Al composites. The microstructure and mechanical properties of graphene/Al composites with different contents of graphene, and the morphologies of the composite powders were investigated by scanning electron microscope, X-ray diffractometer, electronic universal testing machine and hardness tester, respectively. The results show that the graphene uniformly disperses in Al powders using two step methods. Graphene/Al composites are compact, and the graphene nanosheets effectively distribute in the aluminum matrix and present well interface with aluminum matrix. The strength and hardness of graphene/Al composites increase with increasing the content (0.5%-2%, volume fraction) of graphene. When the graphene content is 1%, the composites present the best comprehensive mechanical properties than the others. The strength and hardness of graphene/Al composites reach up to 199 MPa and 82.95HV, compared to aluminum matrix, increased by 99% and 113%, respectively.
Key words: graphene/Al composites; vacuum hot-pressing sintering; microstructure; mechanical property
