Abstract: W2Cu plasma facing gradient heat sink material was fabricated by the powder metallurgy technique.
The microst ructure and thermomechanical properties of W2Cu gradient material were studied. The composition has a graded dist ribution in the cross 2 section. The microst ructure around the interface changes continually through element diffusion at high temperature. And there is no obvious interface between different layers. Af ter sintering ,the copper forms a continuous network st ructure and dist ributes in the surrounding of tungsten particles. The chemical element dist ribution and thermomechanical properties of the W2 Cu gradient material have a graded- 1 dist ribution across the thickness. And it s whole thermal conductivity is 151. 4 W·(m·K) . The thermal shock and thermal cycle test s were conducted on the material under the condition of cooling temperature difference 800 ℃. Af ter the thermal shock test , no cracks were found at the interface. Cracks were observed af ter 83 thermal cycle test s , and the mechanism of crack formation was discussed.