石墨烯添加量对铜基复合材料性能的影响

doi:10.11868/j.issn.1001-4381.2017.001545

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摘要采用一步化学还原法结合放电等离子烧结工艺制备石墨烯增强铜基复合材料，利用XRD、SEM、拉曼光谱、拉伸试验机、纳米压痕仪、涡流电导率仪等研究石墨烯含量对复合材料微观组织、力学性能和导电性能的影响。结果表明：石墨烯在复合材料基体中均匀分布，石墨烯的添加能显著增强铜基体的力学性能。与纯铜相比，添加0.025%（质量分数）的氧化石墨烯，可使其屈服强度提高219.8%，抗拉强度提高35.9%，弹性模量提高6.9%，此外，其导电率仍有93.1% IACS。随着石墨烯含量的增加，复合材料的屈服强度、抗拉强度及弹性模量均有所下降，这是因为高石墨烯含量复合粉体中部分石墨烯纳米片未能被铜颗粒包覆，其与铜基体界面结合强度低，石墨烯的剪切应力转移强化效果降低。

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关键词 ：石墨烯, 铜基复合材料, 一步化学还原, 力学性能, 界面结合

Abstract：Graphene reinforced copper composites were fabricated by a one-step chemical reduction and spark plasma sintering. The effect of graphene content on microstructure, mechanical properties and electrical conductivity properties of composites was investigated by XRD,SEM,Raman spectrometer, tensile testing machine, nanoindentation, eddy current conductivity meter, etc. The results show that graphene is uniformly distributed within copper matrix and can evidently improve the mechanical properties of copper matrix. Compared to pure copper, the yield strength, tensile strength and elastic modulus of composites is enhanced by 219.8%, 35.9% and 6.9% separately with addition of only 0.025% (mass fraction) graphene oxide. Besides, the electrical conductivity of composites remains 93.1%IACS. With the increase of graphene content, the yield strength, tensile strength and elastic modulus of composites decrease. The main reason is that graphene is not well wrapped by copper particles with the increase of graphene content and the bonding between the naked graphene and copper matrix is poor, which weakens the strengthening effect of load transfer.

Key words： graphene copper matrix composites one-step chemical reduction mechanical property interface bonding

收稿日期: 2017-12-17 出版日期: 2019-01-16

中图分类号:	TB331
	TG146.1⁺1

通讯作者: 燕绍九(1980-),男,博士,高级工程师,主要从事磁性材料及石墨烯应用研究工作,联系地址:北京市81信箱72分箱(100095),E-mail:shaojiuyan@126.com E-mail: shaojiuyan@126.com

引用本文:

李秀辉, 燕绍九, 洪起虎, 赵双赞, 陈翔. 石墨烯添加量对铜基复合材料性能的影响[J]. 材料工程, 2019, 47(1): 11-17.
LI Xiu-hui, YAN Shao-jiu, HONG Qi-hu, ZHAO Shuang-zan, CHEN Xiang. Influence of graphene content on properties of Cu matrix composites. Journal of Materials Engineering, 2019, 47(1): 11-17.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2017.001545 或 http://jme.biam.ac.cn/CN/Y2019/V47/I1/11

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