石墨烯强化CuCr25合金的制备与性能

Preparation and mechanical properties of graphene reinforced CuCr25 composites

摘要:

本文采用高压低温SPS烧结的新工艺制备了高硬度高电导率的CuCr25/石墨烯复合材料。X射线衍射（XRD）和拉曼分析（Raman）揭示石墨烯在新合金的制备过程中并未变性亦无新相产生，利用扫描电镜（SEM）以及能谱仪（EDS）进行形貌分析显示石墨烯在新合金中分散均匀。性能测试结果显示，在600℃，300MPa条件下经SPS烧结后制得的CuCr25/石墨烯合金，与对比试验中采用相同工艺制得的未添加石墨烯的CuCr25合金相比，硬度提高了11.3%，电导率下降了4.2%；而与传统工艺制备的CuCr25合金相比，其电导率和硬度则分别提高了35%和48%，表明成分和工艺的改进对性能的提高均有贡献。

Abstract:

Novel graphene reinforced CuCr25 matrix composites (GCMC) with high hardness and conductivity are successfully prepared by spark plasma sintering (SPS) under high pressure and low temperature after low speed ball-milling mix. It is confirmed that the graphene is remained and no new phase is found by X-ray diffraction and Raman spectroscopy. Structural characterization of GCMC is performed using field emission scanning electron microscope（SEM） and energy dispersive spectroscopy（EDS）, which reveals that the graphene is homogeneously distributed in matrix after sintering process. The hardness of GCMC with 1wt.% graphene sintered under 300MPa and 600°C is increased by 11.3% than the values of CuCr25 alloys fabricated by the same method, though the conductivity is decreased by 4.2%. Comparing with the CuCr25 alloys consolidated by conventional method, the conductivity and hardness of new-type GCMC are about 1.35 and 1.48 times higher respectively, which indicates that the additional phase and new process all make contributions to the enhancement of GCMC.