Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第29卷    第4期    总第241期    2019年4月

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文章编号:1004-0609(2019)-04-0709-08
放电等离子烧结石墨烯铝材料的组织与性能
申 超1,朱德智1,罗铭强2,陈文泗2,李 辉2,王春雨3

(1. 华南理工大学 广东省金属新材料制备与成形重点实验室,广州 510640;
2. 广东兴发铝业(江西)有限公司,宜春 336000;
3. 哈尔滨工业大学(威海) 材料科学与工程学院,威海 264200
)

摘 要: 针对石墨烯与铝的界面润湿性差、不易均匀分散等问题,利用超声和机械搅拌方法分散粉体,并采用放电等离子烧结工艺制备成型石墨烯铝材料。借助扫描电镜(SEM)、透射电镜(TEM)、电子万能试验机、导电率测量仪、激光导热仪等设备对石墨烯铝材料的微观组织力学性能和物理性能进行研究,重点探讨镀镍石墨烯的加入对纯铝的力学性能和物理性能的影响。结果表明:采用超声分散和机械搅拌相结合的方法可使镀镍石墨烯均匀分散在纯铝中;随着镀镍石墨烯的含量从0%增加到0.87%(质量分数),石墨烯铝材料的抗拉强度、硬度、导电率和热导率均显著提升;当镀镍石墨烯含量为0.87%时,石墨烯铝材料的抗拉强度达到194MPa,硬度52HB,相对于纯铝放电等离子烧结试样分别提高了168%和23%;石墨烯铝材料的导电率达到48.5%IACS,热导率为193.4W/(K·m)。石墨烯表面镀镍处理有利于石墨烯与铝二者的界面结合,提升其强度和硬度,但界面处过多的镍会降低石墨烯铝材料的导电率。

 

关键字: 石墨烯;放电等离子烧结;微观组织;性能

Microstructure and properties of graphene/aluminum composites prepared via spark plasma sintering
SHEN Chao1, ZHU De-zhi1, LUO Ming-qiang2, CHEN Wen-si2, LI Hui2, WANG Chun-yu3

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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