石墨烯微片对放电等离子烧结制备铜基摩擦材料性能的影响

Effect of Graphene Nanoplatelets on the Properties of Copper Based Friction Materials Prepared by Spark Plasma Sintering

采用放电等离子烧结技术(spark plasma sintering,SPS)制备铜基粉末冶金摩擦材料,研究石墨烯微片含量对铜基粉末冶金摩擦材料物理性能和摩擦磨损性能的影响。结果表明:当石墨烯微片质量分数低于4%时,材料的密度、孔隙率和抗剪切强度随石墨烯微片含量的增加而升高;当石墨烯微片质量分数超过4%后,材料的密度、孔隙率和抗剪切强度随石墨烯微片含量的增加而略微减小;石墨烯微片质量分数为4%时,铜基粉末冶金摩擦材料具有最优的摩擦性能,此时其布氏硬度为82,剪切强度为98.73 MPa。

Copper based powder metallurgy friction materials were prepared by spark plasma sintering(SPS)technology.The effects of graphene nanoplatelets content on the physical properties and friction and wear properties of copper based powder metallurgy friction materials were studied.The results show that when the mass fraction of graphene nanoplatelets is less than 4%,the density,porosity and shear strength of the material are increased with the increase of graphene nanoplatelets content.When the mass fraction of graphene nanoplatelets is more than 4%,the density,porosity and shear strength of the material are slightly decreased with the increase of graphene nanoplatelets content.When the mass fraction of graphene nanoplatelets is 4%,the copper based powder metallurgy friction material has the best friction performance.The Brinell hardness is 82 and the shear strength is 98.73 MPa.