摘要
采用化学镀的方式预先在石墨表面镀镍,再镀铜,制备了具有双镀层的铜/镍包覆石墨复合粉末,并通过放电等离子烧结(SPS)方式制备高性能的石墨/铜复合材料。通过SEM、EDS、TEM和XRD分析手段对复合材料的形貌和微观结构进行观察和分析,并研究镀层的镍含量对复合材料力学性能的影响。结果表明:在石墨表面镀镍可改善石墨与铜的界面结合状态,使得界面结合紧密,石墨与铜基体的界面由Cu/graphite界面转变为Cu/(Ni+Ni_3P)界面和graphite/(Ni+Ni_3P)界面,而且有助于石墨颗粒在复合材料中均匀分布。石墨表面化学镀镍还可显著地提高石墨/铜复合材料的致密度、硬度和抗压强度,而且随镍含量增加,其力学性能逐渐提高。当在复合材料中镍含量为10%时,复合材料的致密度、硬度和抗压强度分别达到99.68%、64.58 HB和281.04 MPa。
Graphite/copper composites with high performance were fabricated by spark plasma sintering(SPS)and Cu coated graphite with Ni pre-coating.The morphologies and microstructures of the composites were characterized by SEM,EDS,TEM and XRD,the effects of nickel content on the physical properties of the composite were investigated.The results show that the Ni coating can improve the interfacial bonding strength between Cu matrix and graphite,and the interface of graphite/Cu composites are composed of copper/(Ni+Ni3P)coating interface and graphite/(Ni+Ni3P)coating interface.The well dispersion of Ni-coated graphite particles in the copper matrix and net-shaped copper matrix can be obtained.Moreover,the hardness,compressive strength and relative density of graphite/copper composites are improved because of the introduction of Ni coating on graphite,and the physical properties increase with increasing the content of Ni coating.The relative density,hardness,and compressive strength of the composites with 10%Ni are 99.68%,64.58 HB and 281.04 MPa,respectively.
作者
赖远腾
甘雪萍
肖柱
李志友
李周
周科朝
LAI Yuanteng;GAN Xueping;XIAO Zhu;LI Zhiyou;LI Zhou;ZHOU Kechao(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;School of Materials Science and Engineering,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495-502,共8页
Materials Science and Engineering of Powder Metallurgy
基金
国家重点研发计划项目(2016YFB0301400)
