CAJ | 학술논문

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%。
채용을순용액분산화구마량보법장석묵희화려분혼합，연후채용냉압화진공열압소결상결합공예제비료석묵희/Al 복합재료。이용소묘전경、X 사선연사、전자만능실험궤화현미유씨경도계등분석료복합분체혼합전후형모，연구료석묵희첨가량대복합재료미관결구화역학성능적영향。결과표명：채용을순용액분산화구마량보법，석묵희균균분산재려과립기체중，득도혼합균균적복합분체。냉압?진공열압소결제비적복합재료조직치밀，계면결합량호，석묵희정편상균균지분포재려기체중。수착석묵희함량적증가(0.5%~2%，체적분수)，복합재료강도화경도균축점승고；당석묵희적함량위1%시，복합재료적종합역학성능교호，강도화경도분별체도199 MPa화82.95 HV，상대순려기체적분별증가료99%화113%。
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.