Effect of Process Parameters on Electrical Conductivity of Graphite/Cu Composites

To prepare graphite/Cu composites with excellent electrical conductivity,effect of such process parameters as milling time,hot pressed sintering parameter and extrusion parameter on electrical conductivity had been investigated.Tensile fractures of the composite were also analyzed by SEM.The results show that electrical conductivity of the composites rised firstly,and then droped with lengthening the milling time and heightening the extrusion temperature.Increasing extrusion ratio and sintering temperature,raising pressure of vacuum hot pressed sintering and prolonging sintering time were all beneficial to improve electrical conductivity of the composites.By compacting under the conditions of 700 MPa and dwell time 30 s,vacuum hot pressed sintering under the conditions of 48 MPa and 600 ℃ for 1 h and hot extrusion of 3 h-milled graphite/copper composite powders,graphite evenly distributed among three-dimensional network of copper matrix in the composite,which effectively played the role of copper with good electrical conductivity.