Fabrication and Properties of Ultrafine W-10Cu Powders and Composite

W-10Cu(by weight) ultrafine powder with particle size of about 250 nm has been synthesized by chemical method,calcination and subsequent hydrogen reduction process with reaction of ammonium paratungstate and copper salt.Scanning electron microscopy(SEM) and elemental analysis results showed that the reduced temperature has a significant effect on powder morphology and purity when sintered at 1300℃ for 120 min in H2 atmosphere,W-10Cu composite derived from injection molding can reach a relative density of 99.37%,and the microstructure are homogeneous.Furthermore,the sintered W-10Cu composite exhibited excellent thermal conductivity of about 217W/(m· K),and the coefficient of thermal expansion is between 6.0×10-6～7.8×10-6K-1 in the temperature range of 25℃ to 600 ℃.