Speaker
Alexander von Muller
(Max-Planck-Institut für Plasmaphysik)
Description
The exhaust of power and particles is regarded as a major challenge in view of the design of a nuclear fusion demonstration power plant (DEMO). In such a reactor, highly loaded plasma facing components (PFCs), like the divertor targets, have to withstand both severe high heat flux (HHF) loads and considerable neutron irradiation. Existing divertor target designs, as e.g. the ITER-like monoblock concept, make use of monolithic W and Cu material grades that are combined to a PFC. Such an approach, however, bears difficulties as W and Cu are materials with inherently different thermomechanical properties and their optimum operating temperature windows do not overlap. Against this background, W-Cu composite materials are promising candidates regarding the application to the heat sink of highly loaded PFCs. In principle, these materials feature a high thermal conductivity combined with acceptably ductile behaviour due to a coherent Cu or Cu alloy matrix. Moreover, they exhibit strength properties significantly higher compared to the used matrix material due to the presence of the W inclusions. Above all, W-Cu composite materials offer metallurgical flexibility as their macroscopic properties can be tailored by customising their microstructure. The contribution will present the latest results regarding the industrially viable manufacturing and characterisation of W-Cu composite materials produced by means of liquid Cu melt infiltration of open porous W preforms. On the one hand, this includes composites manufactured by infiltrating powder metallurgically produced W skeletons. On the other hand, W-Cu composites based on textile technologically produced fibrous reinforcement preforms are discussed. Furthermore, it will be pointed out how these materials can be integrated into PFCs.
Co-authors
Alexander von Muller
(Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany;Technische Universität München, Boltzmannstraße 15, 85748 Garching, Germany)
Dagmar Ewert
(Institut für Textil- und Verfahrenstechnik, Körschtalstraße 26, 73770 Denkendorf, Germany)
Elena Tejado
(Dpto. de Ciencia de Materiales-CIME, Universidad Politécnica de Madrid, E 28040 Madrid, Spain)
Henri Greuner
(Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany)
Jeong-Ha You
(Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany)
Jose Ygnacio Pastor
(Dpto. de Ciencia de Materiales-CIME, Universidad Politécnica de Madrid, E 28040 Madrid, Spain)
Magdalena Galatanu
(National Institute of Material Physics, Atomistilor Street 405 A, Magurele, Ilfov 77125, Romania, Romania)
Markus Milwich
(Institut für Textil- und Verfahrenstechnik, Körschtalstraße 26, 73770 Denkendorf, Germany)
Rudolf Neu
(Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany;Technische Universität München, Boltzmannstraße 15, 85748 Garching, Germany)
Udo Siefken
(Louis Renner GmbH, Schützenstraße 7, 85221 Dachau, Germany)
