The Experimental Research Of In Situ Deformation Cu-Cr Composite Materials Cast Ingot Preparation

This article in view of the present preparation of copper matrix composites in situdeformation method, put forward a method of in situ deformation copper matrixcomposites preparation, that is Ball mill mixing+Vacuum induction melting.There are three parts in the experiment, first, preparation of Cu-Cr mix powder byball mill mixing, though experiments to get the optimal processing parameters of ballmilling; second, selected a appropriate methods to evaluate the uniformity of thedistribution of Cr particles in the Cu-Cr mixed powder; third, electrolytic copper ingot andCu-Cr mixed powder as raw materials for vacuum melting, by changing the method of Crparticles added to the copper liquid, selected the best method of Cr particles added to thecopper liquid.The results showed that, adopted the metallographic observation to analysis thesamples, which were preparation of cold press vacuum sintering after ball millingpreparation of Cu-Cr mixed powder. Evaluated the Cr particles distribution in the coppermatrix preferably. Though experiments, obtained the optimization of samples preparationprocess: the Cu-Cr mixed powder were pressed molding by cold pressing under thepressure of360MPa. The vacuum sintering heat is1084℃, the vacuum sintering holdingtime is30min; The optimum parameters of preparation of Cu-Cr mixed powder by ballmilling: the ball milling speed is250rpm, the ball milling time is90min, the ratio of ballto material is25:1; By changing the method of Cr particles added to the copper liquid,analysis and comparison of the effect of the methods of Cr particles added to Cr particlesdistribution within the copper matrix. The results showed that, the method is Cr particleswith Cu-Cr mixed powder pressed into blocks added to the copper liquid, Cr particles aredistributed in the copper matrix uniformly, and that the preparation of ingot castingporosity is less.