Process And Interface Formation Mechanism Of Copper Clad Aluminum And Long Carbon Fiber Core Filling Continuous Casting

Due to its advantages of good conductivity,low density and low cost,copperclad aluminum composite material is widely used in the field of electronics and communications.In order to improve the mechanical properties of copper clad aluminum composite material,the long carbon fiber was added into copper clad aluminum composite material in this paper.The heat transfer,mass transfer,interface quality,influence factors and control process in the process of composite forming were discussed to provide theoretical support for copper clad aluminum and long carbon fiber core filling continuous casting technology.The process principle of copper clad aluminum and long carbon fiber core filling continuous casting is as follows:The core metal Al and outer metal Cu are melted and kept in two crucibles,respectively.In continuous casting,the pulling device is used to pull the head of the ingot,and the metal Cu first forms the outer tube through the mold made of the inner wall of crystallizer and core metal liquid filling core tube,and the core Al liquid is then filled with the core tube into the outer tube.Meanwhile,the carbon fiber in the center goes down with the ingot device,and the solidified metal wrapped it inside.During the continuous casting process,the metallurgical bonding of bimetal interface and the combination of metal and long carbon fiber are realized through heat and atom diffusion.The pulled rod is reduced by a drawing die at the lower end of the crystallizer.Based on the process principle,this paper has developed with independent intellectual property rights of the copper clad aluminum and long carbon fiber core filling continuous casting process and equipment.A copper clad aluminum and long carbon fiber composite material with the diameter of 8mm,the thickness of the copper layer of 0.3mm and the diameter of carbon fiber is 1 mm has been successfully prepared.The temperature field of continuous casting was simulated using the ProCAST software,and the computational model of 1:1 copper clad aluminum and long carbon fiber core filling continuous casting equipment was established.By comparing the simulation and experimental results,the temperature field simulation results of the model have high accuracy,and the solid/liquid interface simulation results can be used to predict the quality of copper tube in continuous casting billet and the filling effect of aluminum.The long carbon fiber morphology,adding quantity(single/multi beam),influence of process parameters and interfacial properties were studied.The suitable temperature for the combination of aluminum and carbon fiber was 800 ℃.The mechanism and kinetics of Cu/Al interface reaction in the process of copper clad aluminum and long carbon fiber core filling continuous casting have been revealed.The concentration distribution and interface migration distance of Cu in liquid phase under different temperature and time conditions were simulated and compared with the experimental results,which verified the accuracy of the phase field model.The numerical calculation model of heat and mass transfer in the whole process of copper clad aluminum and long carbon fiber core continuous casting were established.The influence of the process parameters of the core casting on the composite quality of the interface was studied by the combination of simulation and test.The parameters of the core casting process were optimized,and the relationship between the thickness of the interface layer and the contact temperature and the cooling rate was established.The optimum process parameters for the preparation of the copper clad aluminum and long carbon fiber composite material were as follows:TCu=1250 ℃,TAI=800 ℃,f=280L/h,l1=50mm,v=80mm/min,l2=80mm.