Study On The Preparation,Performance And Optimization Of High Strength,Corrosion Resistant Copper Based Composites

Particle reinforced copper matrix composites have the advantages of high strength,high conductivity and wear resistance.However,nano alumina particles are easy to agglomerate and do not wet well with copper matrix.Conventional methods such as powder metallurgy and die casting can easily lead to poor bonding strength between reinforcement and copper matrix and uneven particle size distribution,which will affect the realization of composite properties.Therefore,it is of key importance to deal with the diffusion of nanoparticles in copper matrix and improve the interfacial wettability between nanoparticles and copper matrix.In this paper,aluminum oxide powder is obtained by dissolving aluminum nitrate in the copper matrix,and then alumina copper matrix composites are produced by re pressing and re sintering technology,which can not only significantly improve the adhesion between alumina nanoparticles and copper matrix,but also achieve the uniform diffusion of nano alumina in copper matrix.Using the differential temperature differential gravity analysis method for the dissolution of aluminum nitrate,and according to the SEM observation of the obtained alumina particles,it is specified that the dehydration temperature of aluminum nitrate is controlled at 80℃ and the dissolution temperature is controlled at 550℃.under this condition,the alumina nanocrystals are obtained,which not only have uniform grain boundary edges,but also have small particle size and low overall agglomeration degree.In this paper,alumina copper matrix composite powder is produced by external addition and in-situ synthesis Alumina copper matrix composites are produced by the re pressing and re sintering process of powder metallurgy.Finally,the process technology is determined and further optimized.The technical parameters are to control the pressing pressure to 320 Mpa,the sintering temperature to 950℃,the sintering aging to 1.5H,the re pressing to 480 MPa,the annealing aging temperature to 800℃ and the holding time to 1.5H.The experimental results show that the corresponding density coefficient of the composites prepared by in-situ method is higher than that by external addition.The distribution of nano alumina is relatively balanced,so the agglomeration phenomenon is greatly reduced.The surface corrosion resistance of copper matrix composites can be improved by electroplating,which can ensure the quality of products.While maintaining a high level of conductivity,heat conduction,hardness and wear resistance,it can improve the electrochemical corrosion resistance of products.Through the experimental design verification of the parameters affecting the plating thickness and quality,the JMP tool is used to model and analyze the test results,and the significant factors affecting the test results are found out.By modifying the model,leave the factors that have a significant impact on the results,and then find the best factor combination according to the maximization intention.Finally,according to the best factor combination,the experimental results are repeatedly verified again to determine the effectiveness of the experimental results,and finally determine the production parameters,so as to improve the corrosion resistance of copper matrix composites.