| Most domestic copper rolling processes also use traditional three-stage processing methods,smelting ingots-hot rolling-cold rolling.However,in recent years,with the rapid development of the Internet,the Internet of Things technology has made copper purchase and supply more direct and convenient,and supply methods have undergone changes in exploration.Bulk supply has gradually developed into customized supply,and thus the development of a short-process rolling technology has become an innovation in the copper processing industry,and the technology of rolling electrodeposited copper plate to strip directly,without traditional smelting casting process,not only saves energy consumption,but also eliminates sources of pollution.The copper processing short process is an innovative process of ensuring product quality,environmental friendliness,energy saving,and reducing construction investment.Nowadays,the short-process rolling technology of copper is rapidly developing and industrializing in China,and which has made important contributions to the advancement of copper processing technology.Therefore,in this paper,the processing of rolling the electrodeposited copper plate strip directly,the microstructure and properties of the copper plate and strip,and the relevant properties of the copper foil were studied.In order to formulate a reasonable rolling process,the microstructure and mechanical properties of the electrodeposited copper plates were studied first before rolling,and the different degrees of deformation of the electrodeposited copper plate were performed by the rolling mill with performing corresponding annealing treatment.Due to the limit of roller seam,the final rolling thickness,0.4 mm,couldn't meet the requirement of copper foil thickness.So,the rolled copper foil need to be bought.Using XRD,SEM,EBSD and other testing techniques to analyze the phases,grain size,preferred grain orientation,and microstructure of electrodeposited copper plates,copper strips and copper foils,and the physical properties of the copper strip foils were studied through uniaxial tensile test at room temperature,hardness test,electrical conductivity test,flexure resistance test and surface roughness test.The results show:(1)The electrodeposited copper plate preferentially grew on the(220)crystal surface and the grain size was 22.3 nm.The tensile strength was 218 MPa,the elongation after fracture was 20.5%,the reduction of area was 24.96% and the hardness was 63 HV20.(2)For the copper strips that had not been annealed after cold rolling,the crystal grains gradually grew toward the(220)and(311)crystal planes as the deformation degree increases,and the tensile strength gradually increased,with the maximum being 422 MPa,and the elongation gradually decreases,vickers hardness was not obvious,about 113 HV20.(3)In the cold-rolled and annealed copper strips,the crystal grained gradually grow in the direction of the(200)crystal plane with an increase in the amount of deformation,and the tensile strength didn't increase significantly;and the tensile strength decreases significantly comparing with the unannealed copper strip.And the elongation rate increased significantly,the hardness is around 67 HV20.(4)With the increase of the thickness,the(200)crystal plane orientation of the electrodeposited copper foil increased,the roughness increased,and the bending resistance times decreased.The microstructure of the copper foil was tapered,and one side of the copper foil was relatively smooth.(5)The microstructure of the rolled copper foil was hill-like,which was consistent with the rolling direction.With the thickness increasing,the number of bending resistance decreased,the grain orientation and roughness didn't change significantly,both sides of the rolled copper foil were smooth,and bending resistance was significantly better than electrolytic copper foil. |
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