(1. 南昌航空大學(xué) 材料科學(xué)與工程學(xué)院，南昌 330063；
2. 南昌航空大學(xué) 無損檢測(cè)技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室，南昌 330063；
3. 澳大利亞國立大學(xué) 工程與計(jì)算機(jī)技術(shù)學(xué)院，堪培拉 2601)
摘 要: 采用乙醇溶液分散和球磨兩步法將石墨烯和鋁粉混合，然后采用冷壓和真空熱壓燒結(jié)相結(jié)合工藝制備了石墨烯/Al復(fù)合材料。利用掃描電鏡、X射線衍射、電子萬能實(shí)驗(yàn)機(jī)和顯微維氏硬度計(jì)等分析了復(fù)合粉體混合前后形貌，研究了石墨烯添加量對(duì)復(fù)合材料微觀結(jié)構(gòu)和力學(xué)性能的影響。結(jié)果表明：采用乙醇溶液分散和球磨兩步法，石墨烯均勻分散在鋁顆粒基體中，得到混合均勻的復(fù)合粉體。冷壓-真空熱壓燒結(jié)制備的復(fù)合材料組織致密，界面結(jié)合良好，石墨烯呈片狀均勻地分布在鋁基體中。隨著石墨烯含量的增加(0.5%~2%，體積分?jǐn)?shù))，復(fù)合材料強(qiáng)度和硬度均逐漸升高；當(dāng)石墨烯的含量為1%時(shí)，復(fù)合材料的綜合力學(xué)性能較好，強(qiáng)度和硬度分別達(dá)到199 MPa和82.95 HV，相對(duì)純鋁基體的分別增加了99%和113%。
關(guān)鍵字: 石墨烯/Al復(fù)合材料；真空熱壓燒結(jié)；微觀結(jié)構(gòu)；力學(xué)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
