Speaker
Magdalena Galatanu
(National Institute of Materials Physics)
Description
For DEMO fusion reactor an expected heat flux of about 10 MW/m22 should be extracted by the divertor which will have, most likely, an armour part made of W and a following heat sink part made of Cu or ODS Cu alloy. Unfortunately, for these materials the optimum operating temperature windows do not overlap. Thermal barrier materials are interface materials included in such components, aiming to keep the temperatures of both armour and heat sink parts in the corresponding operating windows on one side, and to mitigate the effects of their different thermomechanical properties, on the other side.
Here we propose a simple spark plasma sintering route to create Cu-based composites with a high content (10-40 volume %) of various dispersed materials (Al or Y oxides, C, SiC or W), allowing a fine tuning of the content and a large pool of predefined shapes and dimensions. The resulting specimens can be further joined to armour and heatsink components via a similar electrical field assisted technology. Microstructural and thermal properties are investigated for these materials allowing to select the most suited materials in view of their thermal conductivity and thermal expansion coefficients.
Co-authors
Andrei Galatanu
(National Institute of Materials Physics, Magurele, Romania)
Bogdan Popescu
(National Institute of Materials Physics, Magurele, Romania)
George Ruiu
(National Institute of Materials Physics, Magurele, Romania)
Magdalena Galatanu
(National Institute of Materials Physics, Magurele, Romania;Doctoral School in Physics , University of Bucharest, Atomistilor street no. 405, Magurele, Ilfov, Romania)
Monica Enculescu
(National Institute of Materials Physics, Magurele, Romania)