电流密度对超临界石墨烯电铸层微观结构与性能的影响  

Effects of Current Density on Microstructure and Properties of Graphene Composite Electroforming Layer Under Supercritical Fluids

作　　者：沈宇[1] 雷卫宁[1,2] 王云强[1] 刘维桥[1,2] 钱海峰[1,2] 张桂尚 

机构地区：[1]江苏理工学院机械工程学院,江苏常州213001 [2]江苏理工学院江苏省高性能材料绿色成形技术与装备重点实验室,江苏常州213001

出　　处：《中国表面工程》2016年第4期23-29,共7页China Surface Engineering

基　　金：国家自然科学基金(51275222);江苏省自然科学基金(BK20161198)

摘　　要：为获得电流密度对于超临界石墨烯复合铸层微观结构和力学性能的影响规律,在超临界二氧化碳流体(SCFCO_2)环境下进行了镍基石墨烯复合电铸试验,采用扫描电镜、数显式显微硬度计、微摩擦磨损试验机、光学轮廓仪等对镍基石墨烯复合电铸层进行表征。结果表明:当电流密度从3 A/dm^2逐渐增大至9 A/dm^2时,石墨烯复合电铸层的显微硬度、耐磨性呈持续增大趋势;当进一步增大电流密度时,复合电铸层显微硬度和耐磨性开始降低。在压力为10 MPa,温度为52℃,电铸时间为50 min,电流密度为9 A/dm^2时,石墨烯复合电铸层的显微硬度达到最大860 HV0.2,磨痕截面积最小1 145μm^2,石墨烯含量达最大0.713%。与普通电铸条件相比,SCF-CO_2电铸条件制备的石墨烯复合电铸层显微硬度和耐磨性分别提高了1.25倍和1.31倍。The influence of current density on the microstructure and mechanical properties of the graphene composite electroforming layer based on nickel were investigated under supercritical carbon dioxide fluid （SCF-CO2）. Graphene composite electroforming layer based on nickel was characterized by scanning electron microscope （SEM）, digital micro hardness tester, micro friction and wear testing machine, optical profiler and so on. The results indicate that the microhardness and the wear resistance of the composite electroforming layer increase gradually with the growing current density from 3 A/dm2 to 9 A/dm2. When the current density keeps increasing, the microhardness and the wear resistance of composite electroforming layer begin to fall. In the cases of 10 MPa, 52 ℃, 50 min and 9 A/dm2, the microhardness of graphene composite electroforming layer reaches the maximum of 860 HV0.2, the cross section wear scar area attains the minimum of 1 145 μm2, and the content runs up to the maximum of 0.713%. Compared with the conventional electroforming, the microhardness and the wear resistance of graphene composite electroforming layer fabricated by electroforming under supercritical CO2 are increased by 1.25 times and 1.31 times, respectively.

关 键 词：超临界二氧化碳流体 石墨烯 复合电铸 电流密度 力学性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TQ153.4[金属学及工艺—金属学]