(1. 華南理工大學(xué) 廣東省金屬新材料制備與成形重點實驗室，廣州 510640；
2. 廣東興發(fā)鋁業(yè)(江西)有限公司，宜春 336000；
3. 哈爾濱工業(yè)大學(xué)(威海) 材料科學(xué)與工程學(xué)院，威海 264200)
摘 要: 針對石墨烯與鋁的界面潤濕性差、不易均勻分散等問題，利用超聲和機(jī)械攪拌方法分散粉體，并采用放電等離子燒結(jié)工藝制備成型石墨烯鋁材料。借助掃描電鏡(SEM)、透射電鏡(TEM)、電子萬能試驗機(jī)、導(dǎo)電率測量儀、激光導(dǎo)熱儀等設(shè)備對石墨烯鋁材料的微觀組織力學(xué)性能和物理性能進(jìn)行研究，重點探討鍍鎳石墨烯的加入對純鋁的力學(xué)性能和物理性能的影響。結(jié)果表明：采用超聲分散和機(jī)械攪拌相結(jié)合的方法可使鍍鎳石墨烯均勻分散在純鋁中；隨著鍍鎳石墨烯的含量從0%增加到0.87%(質(zhì)量分?jǐn)?shù))，石墨烯鋁材料的抗拉強(qiáng)度、硬度、導(dǎo)電率和熱導(dǎo)率均顯著提升；當(dāng)鍍鎳石墨烯含量為0.87%時，石墨烯鋁材料的抗拉強(qiáng)度達(dá)到194MPa，硬度52HB，相對于純鋁放電等離子燒結(jié)試樣分別提高了168%和23%；石墨烯鋁材料的導(dǎo)電率達(dá)到48.5%IACS，熱導(dǎo)率為193.4W/(K·m)。石墨烯表面鍍鎳處理有利于石墨烯與鋁二者的界面結(jié)合，提升其強(qiáng)度和硬度，但界面處過多的鎳會降低石墨烯鋁材料的導(dǎo)電率。
關(guān)鍵字: 石墨烯；放電等離子燒結(jié)；微觀組織；性能
（1. Guangdong Key Laboratory for Advanced Metallic Materials Processing, South China University of Technology, Guangzhou 510640, China;
2. Guangdong Xingfa Aluminum (Jiangxi) Co., Ltd., Yichun 336000, China;
3. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264200, China）
Abstract:In order to solve the problem of poor interfacial wettability and difficult to disperse uniformly of graphene and aluminum, the ultrasonic and mechanical stirring were used to disperse powder, and the spark plasma sintering was employed for the fabrication of the aluminum/graphene composites. In order to investigate the influence of Ni-graphene content on the microstructure and properties of aluminum/graphene composites, the microstructure and properties were characterized and determined by scanning electron microscopy(SEM), transmission electron microscopy (TEM), electronic universal testing machine, conductivity measuring instrument, and thermal conductivity tester. The results show that ultrasonic dispersion and mechanical agitation can make Ni-graphene uniformly disperse in pure aluminum matrix. With the content of Ni-graphene increases from 0% to 0.87%, all of the tensile strength, hardness, electrical conductivity and thermal conductivity of aluminum/graphene composites are significantly improved. The tensile strength of the composites reinforced with 0.87% Ni-graphene can reach 194 MPa, and the hardness is 52 HB, which are increased by 168% and 23% compared with those of the pure aluminum prepared via spark plasma sintering, respectively. The conductivity of the composites can reach 48.5%IACS and the thermal conductivity is 193.4 W/(K？m). The Ni-graphene is beneficial for the interface bonding between graphene and aluminum alloy, so, the strength and hardness of the composites can be enhanced. However, too much nickel at the interface will reduce the conductivity of aluminum/graphene composites.
Key words: graphene; spark plasma sintering; microstructures; property
