5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

O2A.4 Advanced Materials for a Damage Resilient Divertor Concept for DEMO

6 Sep 2016, 12:00
20m
Congress Hall 2nd floor (Prague Congress Centre)

Congress Hall 2nd floor

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 4
Oral I. Materials Technology O2A

Speaker

Jan Willem Coenen (Institut für Energie- und Klimaforschung – Plasmaphysik)

Description

Material issues pose significant challenges for future fusion reactors like DEMO. When using materials in a fusion environment a highly integrated approach is required. Cracking, oxidation and fuel management are driving issues when deciding for new materials. Neutron induced effects e.g. transmutation adding to embrittlement are crucial to material performance. Here advanced materials e.g. Wf/W or Cu/W composites allow the step towards a fusion reactor. Recent developments in the area of multi-fibre powder-metallurgical Wf/W will be presented showing a possible path towards a component based on standard tungsten production technologies. Spark-plasma sintering is used as production route to achieve fully-dense materials. Initial mechanical tests and microstructural analyses show potential for pseudo-ductile behavior of materials with a reasonable (30%) fibre fraction. In the as-fabricated condition samples showed step-wise cracking while the material is still able to bear rising load, the typical pseudo ductile behavior of a composite. The optimization of the interfaces is a crucial aspect when establishing this behavior. As damage resilient materials, with an increased operational temperature range facilitate component design with higher exhaust capabilities we propose to utilize the Wf/W composite approach together with self-passivating alloying concepts to maximize the potential of W-based-PFCs.  The lifetime influenced by erosion, creep, thermal fatigue, and embrittlement, needs to be compatible to the requirements from steady state operation. The maximization of operational performance can only be achieved, if improvements of material properties, mechanical and thermal, are well balanced and do not occur at the expense of each other. Wf/W contributes here to advanced material strength and crack resilience even after embrittlement. Together with W/Cu composites at the coolant level high-performance components can be developed. Rigorous testing with respect to PWI and high heat-flux performance are planned to have prototype components available within 5 years for application in existing fusion devices.

Co-authors

Alexander von Mueller (Max-Planck-Institut für Plasmaphysik, Max-Planck-Institut für Plasmaphysik, Garching, Germany) Andrey Litnovsky (Institut für Energie- und Klimaforschung – Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Juelich GmbH, Juelich, Germany) Bruno Jasper (Institut für Energie- und Klimaforschung – Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Juelich GmbH, Juelich, Germany) Christoph Broeckmann (Lehrstuhl für Werkstoffanwendungen im Maschinenbau, RWTH Aachen, 52062 Aachen, Germany) Felix Klein (Institut für Energie- und Klimaforschung – Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Juelich GmbH, Juelich, Germany) Gerald Pintsuk (Institut für Energie- und Klimaforschung – Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Juelich GmbH, Juelich, Germany) Hanns Gietl (Max-Planck-Institut für Plasmaphysik, Max-Planck-Institut für Plasmaphysik, Garching, Germany) Jan Willem Coenen (Institut für Energie- und Klimaforschung – Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Juelich GmbH, Juelich, Germany) Jeong-Ha You (Max-Planck-Institut für Plasmaphysik, Max-Planck-Institut für Plasmaphysik, Garching, Germany) Johann Riesch (Max-Planck-Institut für Plasmaphysik, Max-Planck-Institut für Plasmaphysik, Garching, Germany) Linsmeier Linsmeier (Institut für Energie- und Klimaforschung – Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Juelich GmbH, Juelich, Germany) Michael Riethm (Institute for Applied Materials, Karlsruhe Institute of Technology,, Eggenstein-Leopoldshafen, Germany) Rudolf Neu (Max-Planck-Institut für Plasmaphysik, Max-Planck-Institut für Plasmaphysik, Garching, Germany;Technische Universität München,, Boltzmannstrasse 15, 85748 Garching, Germany, Germany) Sree Sistla (Lehrstuhl für Werkstoffanwendungen im Maschinenbau, RWTH Aachen, 52062 Aachen, Germany) Tobias Wegener (Institut für Energie- und Klimaforschung – Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Juelich GmbH, Juelich, Germany) Yiran Mao (Institut für Energie- und Klimaforschung – Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Forschungszentrum Juelich GmbH, Juelich, Germany)

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