Compact and mechanical properties of W-Cu gradient heat-sink materials

Compact and mechanical properties of W-Cu gradient heat-sink materials fabricated by particle size distribution and hot press solid phase sintering are investigated. The results show that each gradient layer of W-Cu gradient heat-sink materials reaches nearly full density, and relative densities of sealing, transitional and radiating layers are 98.6%, 99.1% and 99.5%, respectively. The leakage rate meets the requirements of vacuum package. With the increase of relative density, the hardness of sealing layer and transitional layer is increasing. With the same relative density, the hardness of transitional layer is higher than that of sealing layer. The bending strength of W-Cu gradient heat-sink materials reaches to 505.8 MPa, being higher than that of each gradient layer. The compress strength of sealing, transitional and radiating layers are 547.1, 619.1 and 416.0 MPa, respectively.