摘要
改善铝金属基体与石墨烯增强相的界面结合,是提高铝基复合材料力学性能的关键。本文以化学镀铜石墨烯为增强相,采用粉末冶金和放电等离子烧结(SPS)技术制备镀铜石墨烯增强铝基复合材料,研究镀铜石墨烯的添加量对铝基复合材料力学性能和耐腐蚀性能的影响。结果表明:通过对石墨烯的敏化活化预处理和化学镀工艺,能够获得石墨烯表面铜颗粒尺寸均一、分布均匀、膜层完整,并具有良好结合力的铜镀层;镀铜石墨烯作为增强相可以改善石墨烯与铝基体的浸润性和界面结合,复合材料中石墨烯质量分数为0.2%时综合性能最优,其致密度达到99.63%,硬度、抗拉强度、弯曲强度分别为60.13HV,152.88MPa,659.47MPa,与纯铝相比,分别提高48.95%,149.48%和470.08%;但是由于复合材料中石墨烯的炭与铝基体构成腐蚀微电偶,使其耐腐蚀性能降低。
Improving the interfacial bonding between aluminum matrix and graphene reinforcement is the key to improve the mechanical properties of the aluminum matrix composites.In this paper,copper-coated graphene reinforced aluminum matrix composites were prepared by powder metallurgy and spark plasma sintering(SPS).The effects of different amounts of copper-coated graphene on the mechanical properties and corrosion resistance of aluminum matrix composites were studied.The results show that through the pretreatment of graphene and electroless plating process,the copper coating on graphene surface with uniform size,uniform distribution,complete film and good bonding strength can be obtained.Copper-coated graphene as reinforced phase can improve the wettability and interface bonding strength between graphene and aluminum matrix.When the content of graphene in the composite reaches 0.2%,the composites exhibit the best performance,the density reaches 99.63%,the hardness,tensile strength and bending strength are 60.13 HV,152.88 MPa and 659.47 MPa,respectively,which increased by 48.95%,149.48%and 470.08%respectively as compared to pure aluminum.However,the composite materials show decreased corrosion resistance due to the galvanic corrosion between graphene carbon and the aluminum matrix.
作者
王禹
朱传平
雷霆
WANG Yu;ZHU Chuanping;LEI Ting(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)
出处
《粉末冶金材料科学与工程》
EI
北大核心
2018年第5期518-526,共9页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金项目(21673297)
东莞市引进创新科研团队项目(2014607101004)
中南大学中央高校基本科研业务费专项资金资助(2017zzts429)
关键词
化学镀铜
石墨烯
铝基复合材料
放电等离子烧结
力学性能
耐蚀性能
electroless copper plating
graphene
aluminum-based composites
SPS
mechanical properties
corrosion resistance
