Study On Deformed Microstructure And Propertie Of Al₂O₃/Cu Composite Prepared By Powder Metallurgy

Al₂O₃/Cu composite has been widely used as electrode material, contact material and integrated circuit leadframe material, because of combination of high strength, high conductivity and excellent high-temperature property. Powder Metallurgy (PM) is an approach to prepare Al₂O₃/Cu composite, in which different powders are mixed uniformly, pressed, and then sintered at certain temperature. In this paper, Al₂O₃/Cu composite was prepared by PM technique. In order to optimize process parameters, various factors which affect the preparation process of Al₂O₃/Cu composite have been studied. The influences of different deformation methods on microstructures and properties of Al₂O₃/Cu Composite have also been investigated in order to search appropriate technology of plastic deformation for Al₂O₃/Cu composite. The results show that:(1) While Al₂O₃/Cu composite is prepared by PM, the optimal content of Al₂O₃ particles is 1.2wt%, and the optimal sintering temperature is 900℃.(2) Compared to non-pressure sintering, Hot pressed sintering can prepare Al₂O₃/Cu composite with higher combination properties.(3) Cold forging technology can improve the combination properties of Al₂O₃/Cu composite at a certain degree. The density, conductivity and hardness of Al₂O₃/Cu composite forged by 80% deformation rates are 98.90%, 84.66%IACS and HB123 respectively.(4) Cold equal channel angular pressing technology unfit for plastic deformation of Al₂O₃/Cu composite. Surface of the sample deformed by 1 pass of cold equal channel angular pressing was cracked evidently.(5) Hot equal channel angular pressing technology can improve the combination...