石墨烯增强铜基复合材料显微组织和性能的研究

Microstructure and Properties of Graphene Reinforced Copper Matrix Composites

采用粉末冶金法制备了质量分数为0%(纯铜)、0.4%、0.8%和1.2%的石墨烯增强铜基复合材料,利用光学显微镜、高分辨场扫描电镜、高精度固体密度仪、数字式电导率仪和万能试验机对石墨烯增强铜基复合材料的微观组织和性能进行研究和分析。结果表明,铜粉纯度高、无杂质,随着石墨烯含量的增加,复合材料的孔隙率随之增加,而且石墨烯的团聚现象逐渐加重,晶粒尺寸呈现先降低后提高的现象,而石墨烯含量在0.8%时,晶粒尺寸最小为43.385 nm。以复合材料的物理性能方面来说,石墨烯增强铜基复合材料的密度和电导率呈现下降趋势。随着石墨烯含量的增加,复合材料的屈服强度和最大抗压强度呈现先上升后下降的趋势,而压缩率呈现逐渐下降的趋势,当石墨烯含量为0.8%时,屈服强度和最大抗压强度达到最大值,分别为80.79和332.88 MPa。

Graphene reinforced copper matrix composites with mass fractions of 0%(pure copper),0.4%,0.8%and 1.2%were prepared via powder metallurgy,and the microstructures and properties of the graphene-reinforced copper matrix composites were investigated and analysed via optical microscopy,high-resolution field scanning electron microscopy,a high-precision densitometer digital conductivity meter and a universal testing machine.The results show that the copper powder is pure and free of impurities.With increasing graphene content,the porosity of the composites increases,and the agglomeration phenomenon of graphene is gradually aggravated.The grain size decreases and then increases,reaching the smallest value of 43.385 nm with a graphene content of 0.8%.For the physical properties of the composites,the graphene reinforced copper matrix composites exhibits decreasing trends in both density and conductivity.With increasing graphene content,the yield strength and maximum compressive strength of the composites first increase and then decrease,while the compression ratio gradually decreases.The yield strength and the maximum compressive strength reach maximum values of 80.79 and 332.88 MPa,respectively,when the graphene content is 0.8%.