镍含量对铜基石墨烯复合材料力电性能的影响

Strength and Electrical Properties of Graphene Reinforced Copper Matrix Composites with Different Nickel Contents

通过镍的添加来改善铜与石墨烯之间较差的界面结合性能，从而提高铜基石墨烯复合材料的力学和电学性能。本实验采用放电等离子（SPS）烧结技术制备了石墨烯含量为0．2％（质量分数，下同），镍含量分别为1．0％，1．5％和2．0％的镍掺杂石墨烯／铜（G-Cu／Ni）复合材料。利用拉曼光谱（Raman）、X射线衍射（XRD）、扫描电子显微镜（SEM）等表征手段，对镍掺杂石墨烯／铜（G-Cu／Ni）复合粉末的形貌和石墨烯的结构进行了研究，揭示了不同镍含量对铜基石墨烯复合材料力电性能的影响。结果表明：随着镍含量的增加，复合材料的硬度随之增加，屈服强度先升高后降低；其电学性能随着镍含量的增加而逐渐降低。当镍含量为1．0％时，复合材料的力学和电学性能达到较好的配合：复合材料的屈服强度为320．3MPa（相对于未添加镍的石墨烯／铜复合材料而言提高了31．08％），电导率为45．72MS·m-1，其电导率百分值（IACS）高达80．21％。

To improve the poor interface bonding between copper and graphene, nickel was added to improve the mechanical and electrical properties of graphene/copper composites. This experiment adopted the spark plasma sintering （SPS） technique to prepare graphene/copper （G-Cu/Ni） composite materials with graphene content of 0. 2% （mass fraction, hereinafter）, nickel content of 1.0% , 1.5% and 2.0%. Raman spectroscopy （Raman） , X-ray diffraction （XRD） and scanning electron microscope （SEM） characterization methods were used to research the morphology of nickel/copper composite powder （ G-Cu/Ni ） and structure of graphene, and the effect of nickel content on the strength and electrical properties of graphene reinforced copper matrix composites were revealed. The results showed that with the increase of nickel content, the hardness of the G-Cu/Ni composite increased, yield strength increased at first and then decreased; the electrical properties gradually descended with the increase of nickel content. When the nickel content was 1.0% , mechanical and electrical properties of the G-Cu/Ni composites reached a good balance： the composite material yield strength was 320.3 MPa, which was increased by 31.08% compared with graphene/copper composite material without nickel. The electrical conductivity of G-Cu/Ni composite materials was 45.72 MS·m-1 , and the IACS was as high as 80.21%.