Preparation Of Graphene Surface Modification And Matrix Microalloying Synergistic Strategy For Strengthening Copper Matrix Composites And Their Properties

Copper and its alloys have superior p Hysical properties and are used in a variety of uses in both domestic and high-precision parts.Copper and its alloys are ideal candidates for electrical sliding contacts,resistance welding electrodes,heat sinks,and other applications due to these properties.Despite these benefits,the biggest disadvantage being its poor strength as opposed to other structural metal alloys and composites such as iron and titanium.As a result,much effort has been dedicated to developing copper’s mechanical properties by fabricating new alloys or composites with the lowest possible degree of electrical conductivity attenuation.This paper proposes a synergistic technique for improving graphene dispersion in the copper matrix,improving the carbon-copper interface bonding,and generating solid carbon compounds for "riveting" synergistically utilizing graphene surface alteration filled with metal ions and matrix microalloying.Improved graphene dispersion in the copper matrix,improved carbon-copper interfacial bond,and generation of solid carbon compounds for "riveting" improved the copper matrix composites.The findings of the experiment reveal that:1.Graphene oxide(GO)was prepared from scaled graphite under strong acid and alkali conditions using a modified Hummers method.The GO was prepared in the form of a transparent muslin with increased lamellar spacing,introducing many oxygen-containing functional groups and increasing the number of nucleation sites for the loaded metal particles.2.Copper-plated graphene(RGO@Cu)composite powder was prepared by adjusting the p H value with anhydrous copper sulfate as the main salt.At a PH of 10,the reduced copper particles were spherical and replaced many oxygen-containing groups in the graphene oxide.3.The RGO@Cu/Cu-Ti composite powder was prepared by doping a certain amount of titanium powder in the copper matrix by a mechanical alloying method.The particle size of the composite powder was reduced to 5μm after 4h ball milling of RGO@Cu powder and titanium powder,and the original spherical powder showed a flaky structure after ball milling.4.Changing the RGO@Cu addition number,the densities and electrical conductivity of the composites steadily decreased,while the tensile strength and microhardness of the composites rose and then fell,reaching a height at the addition amount of 0.4wt%,which was 121.5HV and 285 MPa respectively.5.The RGO@Cu/Cu-Ti sintered body composite was prepared by adding 0.4 wt% of RGO@Cu.The addition of different mass fractions of titanium to the matrix resulted in a significantly lower electrical conductivity after matrix alloying,but significantly higher mechanical properties,with a 13.6% increase in tensile strength to 324 MPa compared to that without the addition of titanium and an 89.5% increase compared to pure copper,but a significant reduction in elongation,reduced from 32% to 11%.