Fabrication and properties of the W2Cu gradient heat sink materials for plasma facing materials

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.