In Situ Preparation Of Carbon Nanosheets Reinforced Copper Matrix Composites With Solid Organic Matter As Carbon Source And Their Properties

Copper has many advantages,such as thermal conductivity,easy processing,easy recycling,and abundant reserves.It is widely used in many fields such as electronics,national defense,construction,and thermal equipment.With the development of the times,the performance of traditional copper-based materials cannot meet the application requirements of certain fields.Carbon nanotubes and graphene,as typical representatives of carbon nanomaterials,are used as reinforcements for copper-based composite materials because of their excellent mechanical,electrical,and thermal properties.However,the poor wettability of carbon and copper and the large density difference make it difficult to uniformly disperse the carbon in the copper matrix.In this paper,glucose and polyethylene glycol were used as carbon sources,and carbon nanosheets(CNS)/copper composites were prepared by a combination of in-situ generation and SPS sintering.A series of microscopic characterization and performance testing of CNS/Cu composite materials were carried out.At the same time,the influence of different process parameters on its morphology and performance was explored and analyzed.In addition,the influence of the presence of iron on the morphology and properties of composite materials was also explored.In addition,the composite powder prepared above was oxidized to obtain Cu_xO/C and Cu_xO/Fe_xO_y/C composites,and their electrochemical performance was studied.The main conclusions are as follows:(1)In the molten salt,glucose is used as the carbon source to generate CNS reinforced copper matrix through in-situ high-temperature carbonization.Through the characterization of CNS/Cu composite,it is found that carbon is uniformly distributed in the copper matrix.CNS/Cu has the best performance at a reaction temperature of 800?.Its compressive yield strength and hardness are 283MPa and 78HV,respectively,which are 3.14 times and 1.7 times that of pure copper,respectively.(2)When the carbon content is relatively low,the doping of iron can significantly improve the mechanical properties of CNS/Cu.(3)The CNS/Cu composite material prepared by using polyethylene glycol as the carbon source has excellent properties,and at the same time has achieved the improvement of strength,elongation and conductivity.Its tensile strength,elongation and electrical conductivity have reached 327.4MPa,53%and 97.6%IACS,respectively,which are increased by 13%,206%and16.9%respectively compared with pure copper.(4)Cu_xO/C and Cu_xO/Fe_xO_y/C as anode materials of lithium-ion batteries both show good electrochemical performance.Its first discharge capacity is 2098.7 m A h g^-1 and 1843.9 m A h g^-1,which are much higher than the theoretical capacity of copper oxide.