石墨烯纳米片/聚四氟乙烯复合材料的制备及磨损性能研究

Study on the preparation and wear behavior of graphene nanosheet/PTFE composites

以石墨烯纳米片、聚四氟乙烯(PTFE)为原料,制备了石墨烯纳米片/聚四氟乙烯复合材料.研究了不同石墨烯纳米片含量(0,0.25%,0.50%,0.75%,1.00%,1.25%(质量分数))对复合材料导热性能、力学性能、摩擦磨损性能的影响.结果表明,随着聚四氟乙烯中石墨烯纳米片含量的增加,复合材料的微观结构趋于无序,其导热系数逐渐增大,导热性能逐步增强;当石墨烯纳米片含量为0.75%(质量分数)时,复合材料的抗拉强度和断裂伸长率最佳;当石墨烯纳米片含量为1.25%(质量分数)时,复合材料的摩擦系数最小,为0.195,磨损量最低,仅37mg.磨损实验前后复合材料的碳结构发生了变化,磨损后复合材料的缺陷增大,石墨化程度大大降低,石墨烯纳米片/聚四氟乙烯复合材料具有良好的耐磨损性能.

In this paper,graphene oxide polytetrafluoroethylene composites were prepared with graphene oxide and polytetrafluoroethylene as raw materials.The effects of different graphene oxide content (0,0.25%,0.50%,0.75%,1.00%,1.25wt%) on the mechanical properties,thermal conductivity and friction and wear properties of the composites were investigated.The results showed that the microstructure of composites tended to be disordered with the increase of graphene oxide content in polytetrafluoroethylene.The thermal conductivity of teflon materials would be better and better,and the thermal conductivity would increase gradually.Tensile strength and elongation at break were best when the go content was 0.75wt%.When the graphene oxide content was 1.25wt%,the friction coefficient of teflon material was the smallest,0.195 and the wear was the lowest,only 37 mg.The carbon structure of the composites changed before and after the wear test.The defects of the composites increased after wear and the degree of graphitization was greatly reduced.The graphene oxide tetrafluoroethylene composite material had better wear resistance.