Preparation And Mechanical Properties Of Layered Carbon Nanomaterials Reinforced Copper Matrix Composites

In this paper,the basic process of preparing layered carbon nanomaterials reinforced copper matrix composites by the combination of electrodeposition and discharge plasma sintering（SPS）is explored,and the microstructure,mechanical properties and toughening mechanism of the composites are studied and discussed.In this paper,carbon nanomaterial/copper matrix composite films were firstly prepared by composite electrodeposition method.By controlling the process parameters of composite electrodeposition,composite films with different microstructure were obtained,which were used as structural elements to construct layered composite materials.Secondly,the composite films are superimposed in different ways to regulate the layered structure.Finally,the lamellar composite was obtained by using SPS process for the deformed sintering of superposed composite films.The microstructure and mechanical properties of layered materials with different structural parameters were studied by scanning electron microscope,transmission electron microscope and mechanical tensile test.The preparation of carbon nano/copper matrix composite films by electrodeposition was studied.The composite electrodeposition solution was prepared by copper salt solution,concentrated sulfuric acid and carbon nanotube（graphene）dispersion solution.Then two phosphorous copper plates were used as the anode and titanium as the cathode to be placed in the electroplating tank.The dc power supply was used as the experimental power to conduct the composite electrodeposition.The experiments show that the micro-morphology and carbon nanophase content of the composite film are affected by the current density.As the conversion current density increases,the carbon nanotube content of the composite film increases continuously.It appears when the current density reaches 2 A·dm^-2 The phenomenon of carbon nanophase agglomeration.The grain size of the composite film is also affected by the current density,and the grain size of the composite film is found to decrease with the increase of the current density.Through the analysis of the experimental results,when the current density of composite electrodeposition is less than 1.5A·dm^-2,the carbon nanomaterials in the composite film can maintain good dispersion,and the carbon nanotubes（graphene）maintain A relatively complete structure.Changing the process parameters of composite electrodeposition can regulate the structure of carbon nanocomposite films,and the resulting composite films are the key to the subsequent preparation of layered carbon nanotube composites.In the experiment,the composite films obtained by composite electrodeposition were superimposed in different ways,and the layered carbon nanotube copper matrix composites were prepared by sintering with SPS.The microstructure and mechanical properties of the composites were examined by means of field emission scanning electron microscope,transmission electron microscope and mechanical experiment machine.Experiments show that the same parameter superposition of composite membrane preparation of composite materials with the increase of current density,the increase of the content of carbon nanotubes composite material yield strength and tensile strength increases gradually,and because of the introduction of the layered structure of delayed crack extension,the elongation of the composite also remains at a high level.However,when the carbon nanotubes in the composites were agglomerated,the comprehensive mechanical properties of the composites decreased obviously.In different parameters of the composite membrane stack alternately in composite materials,1/1.5 CNT/cu composite showed the highest yield strength and tensile strength of 282 MPa and 370 MPa,respectively,at the same time extend rate of35.5%,compared with preparation of composite materials under the same parameters,1/1.5 composites not only retain the current density of 1 A·dm^-2 during the preparation of composite Gao Yanshen rate,retained the same current density of 1.5 A·dm^-2composite material has high strength.This shows that the mechanical properties of lamellar composites prepared with different parameters can maintain the high strength and high elongation of the composites prepared with a single parameter.Its mechanical properties not only have the high strength of single parameter composite materials,but also maintain its high elongation.The uniform distribution of each layer of carbon nanotubes obtained by composite electrodeposition ensures the high strength of the composite material.At the same time,the CNT/Cu composites obtained good ductility through the cooperative deformation of layered structure.