先以泡沫镍(NF)为基底,采用浸渍法制备了碳纳米管/泡沫镍(CNTs/NF)复合电极,然后通过电泳沉积法在复合电极表面沉积一层石墨烯得到还原氧化石墨烯/CNTs/NF(rGO/CNTs/NF)复合材料,最后去除NF得到rGO/CNTs复合材料,并通过扫描电镜、X射线衍射、拉曼光谱对其形貌、物相、结构进行表征。在此基础上制备了rGO/CNTs/环氧树脂(rGO/CNTs/EP)复合涂层样品,研究了复合涂层表面在高压静电充电条件下的电荷耗散特性以及沿面闪络特性。结果表明:电化学沉积过程中还原了氧化石墨烯(GO)得到了rGO/CNTs复合材料;rGO/CNTs/EP复合涂层表面电阻率随填料的增加而减小;在高压静电充电后,涂层表面电荷随时间衰减,且衰减速率随rGO/CNTs添加量的增加而增大;复合涂层的闪络电压较EP涂层低,且随填料的增加而降低,而在积聚静电后略有提升。

A carbon nanotube/nickel foam (CNTs/NF) composite electrode was prepared by impregnation method,and then graphene/carbon nanotube/nickel foam (rGO/CNTs/NF) composite was obtained by electrophoretic deposition on the surface of the composite electrode.Finally,the graphene/carbon nanotube (rGO/CNTs) composite was obtained by removing foam nickel.The morphology,phase and structure were characterized by SEM,XRD and Raman spectrum.On this basis,the samples of graphene/carbon nanotubes/epoxy resin (rGO/CNTs/EP) composite coating were prepared.The surface electrostatic dissipation and flashover characteristics of the coating were studied under the condition of high voltage electrostatic charging.The results shown that:in the process of electrochemical deposition,the graphene oxide (GO) was successfully reduced and the rGO/CNTs composite was obtained during the electrochemical deposition process.The surface resistivity of the rGO/CNTs/EP coating decreased with the increase of filler.After high voltage electrostatic charging,the surface electrostatic of the coating decreased with time,and the decay rate increased with the increase of rGO/CNTs.The flashover voltage of rGO/CNTs coating was lower than that of EP coating,and decreased with the increase of filler,and increased slightly after the electrostatic accumulation.