Hannover 2016 – scientific programme
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P: Fachverband Plasmaphysik
P 5: Poster Session- Helmholtz Graduate School for Plasma Physics
P 5.25: Poster
Monday, February 29, 2016, 16:30–19:00, Empore Lichthof
Further development of the tungsten-fibre reinforced tungsten composite — •Hanns Gietl1, Martin Aumann2, Jan Coenen2, Till Höschen1, Philipp Huber3, Rudolf Neu1,4, and Johann Riesch1 — 1Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany — 2Forschungszentrum Jülich, IEK4, 52425 Jülich, Germany — 3Lehrstuhl für Textilmaschinenbau und Institut für Textiltechnik (ITA), 52062 Aachen, Germany — 4Technische Universität München, 85748 Garching, Germany
For the use in a fusion device tungsten has a unique property combination. The brittleness below the ductile-to-brittle transition temperature and the embrittlement during operation e.g. by overheating, neutron irradiation are the main drawbacks for the use of pure tungsten. Tungsten fibre-reinforced tungsten composites utilize extrinsic mechanisms to improve the toughness. After proofing that this idea works in principle the next step is the conceptual proof for the applicability in fusion reactors. This will be done by producing mock-ups and testing them in cyclic high heat load tests. For this step all constituents of the composite, which are fibre, matrix and interface, and all process steps need to be investigated. Tungsten fibres are investigated by means of tension tests to find the optimum diameter and pretreatment. New interface concepts are investigated to meet the requirements in a fusion reactor, e.g. high thermal conductivity, low activation. In addition weaving processes are evaluated for their use in the fibre preform production. This development is accompanied by an extensive investigation of the materials properties e.g. single fibre tension tests.