Preparation And Properties Of Carbon Nanotube-graphene Reinforced Aluminum Matrix Composite

Nanocarbon materials such as multi-walled carbon nanotubes(MWCNTs)and graphene(GN)have been used as reinforcing phases for lightweight aluminum matrix composites due to their excellent mechanical properties and self-lubricating properties.In this paper,the composite reinforcing phase MWCNTs-GN was prepared by highenergy ball milling(wet process)process,and the MWCNTs-GN/Al composite powder and material were prepared by high-energy ball milling + vacuum hot pressing molding.The effects of dispersant,addition amount,ball milling process and hot pressing temperature on the microstructure,mechanical properties and wear properties of MWCNTs-GN composite reinforced phase and MWCNTs-GN/Al composite were investigated.The MWCNTs-GN composite reinforced phase was prepared by ultrasonic dispersion combined with high-energy ball milling(wet method).The MWCNTs-GN composite reinforced phase was prepared by using 1:1 mass ratio of MWCNTs:GN,500 rpm high energy ball milling speed,30 min ball milling time,and sodium dodecyl diphenyl ether disulfonate(SLDED)as dispersant.The MWCNTs-GN composite reinforced phase(0.5 wt.%)was mixed with aluminum powder,and the uniformly dispersed MWCNTs-GN composite powder was prepared by high energy ball milling at800/1000 rpm with a ball milling time of 30 min,and the MWCNTs-GN/Al composite was prepared by vacuum hot pressing at 570 ℃ with a hot pressing time of 30 min.The mechanical properties of the composites were optimal with hardness 144.78 HV,tensile strength 217.50 MPa,elongation 4.78 %,wear rate 0.0897 cm3/MJ and friction coefficient 0.4163.Comparing the effects of MWCNTs,GN and MWCNTs-GN composite reinforcement on the organization and properties of aluminum matrix composites,MWCNTs-GN/Al composites have higher mechanical properties and wear resistance than MWCNTs/Al or GN/Al;the tensile strength and strain rate of MWCNTs-GN/Al composites are increased by 79.52 %,28.60 % compared to pure aluminum;23.50 %,2.60 % compared to MWCNTs/Al;43.55 %,59.37 % compared to GN/Al,The tensile strength and strain rate of MWCNTs-GN/Al composites increased by 79.52 % and 28.60 %compared to pure aluminum;23.50 % and 2.60 % compared to MWCNTs/Al;43.55 %and 59.37 % compared to GN/Al.The wear rate of MWCNTs-GN/Al composites decreased by 69.7 % compared to pure aluminum;24 % compared to MWCNTs/Al;58.12 % compared to GN/Al.Improving the mechanical properties and wear resistance of aluminum matrix composites is still an urgent problem for the development of aluminum matrix composites.The analytical study of MWCNTs-GN composite reinforcing phase provides a new direction and field for the search of efficient carbon-based reinforcing phase for aluminum matrix composites,as well as the development of aluminum matrix composites.