Preparation And Properties Of Nickel-Tungsten-Copper Composites

Nowadays,alloys with solid thermal conductivity and corrosion resistance are widely used in aerospace,marine,microelectronic parts and other fields.In this paper,the nickel-tungsten alloy coating was prepared by electrodeposition,and its thermal conductivity and corrosion resistance were studied.The nickel-tungsten-copper alloy coating was prepared by adding copper ions to strengthen the thermal conductivity and make it a functional composite material with high thermal conductivity and low cost.It is expected to provide suitable composite materials under different application conditions.The primary research is as follows:1.The optimal electrodeposition process parameters were determined by COMSOL Multiphysics software simulation.The influence of process parameters on the rate of the electrodeposition process and the uniformity of deposited coating was verified.Finally,the optimal process parameters were determined by simulation: the potential was 1.4V,the temperature was 40°C,the electroforming time was one h,and the stirring rate was 240r/min.Primary salt nickel sulfate 50g/L.2.Nickel-tungsten composites and nickel-tungsten-copper composites were prepared by electrodeposition.The properties of the composites were controlled by controlling the content of tungsten tungstate and copper sulfate,thereby changing their properties.In addition,the surface morphology was observed by scanning electron microscopy(SEM),and the elemental composition was determined by XPS(X-ray photoelectron spectroscopy)and XRD(X-ray diffractometer)to grasp its structural characteristics better.The prepared composites’ thermal conductivity and corrosion resistance were tested using a laser thermal conductivity meter and an electrochemical workstation.The optimum concentration of sodium tungstate measured in this project is20g/L.The surface of the nickel tungsten composite is dense and smooth,and the preparation is excellent.When the nickel-tungsten-copper composite material is 20g/L copper sulfate,the surface morphology is dense,without bulges,cracks and pores,and copper ions are evenly distributed on the surface of the substrate.Finally,Ni-W composites and Ni-W-Cu composites were successfully prepared.It was determined that the thermal conductivity of Ni-W composites with 20g/L sodium tungstate was the best,and its thermal conductivity was32.920W/(m·K).The thermal conductivity of Ni-W-Cu composites with 20g/L copper sulfate was the best,and the thermal conductivity was 107.540W/(m·K).It is determined that the Ni-W composite material with 30g/L sodium tungstate has the best improvement in corrosion resistance,and the Ni-W-Cu composite material with 20g/L copper sulfate has the best improvement in corrosion resistance,which is 16.5% lower than the corrosion voltage of copper sulfate without addition.Through comparison,it is found that the thermal conductivity and corrosion resistance of nickel-tungsten composite materials are good.The thermal conductivity of nickel-tungsten-copper composite materials is higher than that of nickel-tungsten composite materials,and the corrosion resistance is similar to that of nickel-tungsten composite materials.Therefore,appropriate composite materials can be selected according to different application environments to reduce costs and ensure performance.