Research On Cu-CeO2Composite Material Prepared By Pulse Electroforming And Its EDM Properties Of Resistance To Electrical Erosion

Metal electrodeposition is a process of metal ions in the liquid phase reduct and depositedas metal in the cathode under the role of current. Metal electrodeposition can be carried out inaqueous solution, organic solution or molten salt, which has a very wide range of applicationsin industrial production, mainly electric metallurgy, electric refining, electroforming,electroplating and so on.Composite electroforming technology is a new technique developed when existing metalmaterials can not fully meet the needs of industry development. The technology is a craft ofobtaining a composite electroforming layer by adding one or more non-soluble solid particlesin the original electroforming solution and making the particles and metal ions depositedtogether in the deposition process,which is based on the principle of electro-deposition.As the deteriorating of the working conditions, the demands for its performance ofhigh-temperature and wear resistance are increasing. The CeO2nanoparticles containing rareearths are used in pulsed electroforming layer assisted by ultrasonic wave. Nano-CeO2reinforced copper matrix composites are prepared and used as EDM electrodes. The effect ofthe process parameters (adding amount of nanoparticles, the average current density in thecathode, duty cycle, pulse frequency) on the content of CeO2in the composite material, thehardness of the composite material and the surface morphology are analyzed. The properties ofhardness, wear resistance and corrosion resistance are tested and the mechanism of itsimproving performance is also analyzed. The work is as follows:(1) Optimize the process parameters. After determining the electroforming liquid formulation,the surface roughness of each sample, the size and the densification degree of the compositegrains and the content of Ceria (CeO2) can be detected by the method of varying the processparameters. The optimum parameters for preparing composite electroforming EDM electrodeare determined as follows: the adding amount of nanoparticles of CeO2is30g/L, the averagecurrent density in the cathode is10A/dm2, the pulse frequency is2000Hz, duty cycle is0.3, thepower of ultrasonic wave is50W and the temperature of electroforming liquid is35℃.(2) Test the composite electroforming layer. Through the test of composite electroforming layerprepared by orthogonal testing, the impact of each factor on the content of CeO2in compositeelectroforming layer is determined. The performance parameters, such as microstructure, surface hardness, surface roughness, corrosion and so on, of each composite electroforminglayer are analyzed, thereby preparing a dense-matrix composite electroforming layer. Thecomposite electroforming layer having fine, dense and homogeneous grains has higherhardness and better corrosion resistance, which can ensure the performance of the EDMelectrode prepared good.(3) EDM electrode experiments. The electrode samples prepared by orthogonal experiment aretaken and then EDM experiments are carried out on them at higher electrode wear quasi-regulation. The optimum proportion of CeO2and experimental parameters are finally obtainedby the analysis and comparison of electrode wear.