Effect of HfO2 doping on microstructure and properties of W-20Cu composites prepared by wet chemical method
W-20Cu composite powder was prepared by wet chemistry method,the spherical shell precursor was obtained by spray drying method,and then the second phase particles of HfO2 were successfully introduced into W-20Cu composite powder by hydrogen reduction,and the existence form and distribution status of the introduced HfO2 in W-Cu composite powder were determined.W-20Cu composite with uniform distribution of fine HfO2 particles was prepared by high temperature liquid-phase sintering.The results show that,due to the dispersed distribution of HfO2 particles in the W particle surface and the W/Cu interface gap,the coarsening of W particles during sintering is inhibited,thus reducing the W-W connectivity,making the W-20Cu-HfO2 composite show high comprehensive performance.Among them,when the sintering temperature is 1350℃,the high density is about 97%,and the composite material obtained with 0.5%HfO2 has the best comprehensive performance,the maximum hardness can reach 338HV,the bending strength is 826 MPa,and the thermal conductivity is 209W/(m·K).
wet chemical methodW-Cu compositeHfO2 particlescomprehensive property
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