Fabrication of tungsten/copper functionally gradient materials with nearly full density by hot press

High density W-Cu functionally gradient material was fabricated by particle size distribution method and hot press.The effects of sintering temperature,pressure,holding time on the density,hardness and microstructure of the gradient materials were investigated.The results show that W-Cu functionally gradient materials with full density can be fabricated by this method.The interface between each layer is clear,each layer achieves high density,and the component of initial gradient design can keep stable.Three-layer W-Cu functionally gradient materials with nearly full density are fabricated under the processing conditions of sintering temperature 1 060 ℃,pressure 85 MPa and holding time 3 h.The relative densities of sealing layer,transitional layer and radiating layer are 98.6%,99.1% and 99.5% respectively,and the hardness are 91.6,95.6 and 74.4 HRB respectively.