Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 18: Plasma Wall Interaction I - Poster
P 18.3: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Zelt Ost
Powder mtallurgically produced tungsten fiber-reinforced tungsten composites — •Yiran Mao1, Jan.W Coenen1, Johann Riesch2, Sree Sistla3, Leonard Raumann1, Martin Bram4, Jesus Gonzalez4, Till Höschen2, Alexis Terra1, Christian Linsmeier1, and Christroph Broeckmann3 — 1Forschungszentrum Jülich GmbH, IEK-4, 52425 Jülich, Germany — 2Max-Planck-Institut für Plasmaphysik, 85748 Garching b. München, Germany — 3RWTH Aachen University, IWM, 52062 Aachen, Germany — 4Forschungszentrum Jülich GmbH, IEK-1, 52425 Jülich, Germany
In future fusion reactors, tungsten (W) is the main candidate material for plasma facing component. The intrinsic brittleness is a concern with respect to the fusion environment - high transient heat loads, neutron irradiation. To overcome this drawback, tungsten fiber reinforced tungsten (Wf/W) composites are being developed relying on an extrinsic toughing principle. In this work, recent development progress on powder metallurgy produced Wf/W will be discussed, showing a promising avenue to produce a dense bulk Wf/W composite. The work focuses on recent progress in Wf/W manufacturing and characterization. A main difficulty during sintering is the fiber embrittlement due to carbon contamination. These issues can be solved by separating the powders and graphite tool with a tungsten foil. Preliminary mechanical testing are performed in the as-fabricated condition. It shows that the existing of the weak interface reduces the strength of the composite, but, in return, allow to realize the pseudo ductility mechanism. This discrepancy and the resulting constraints for the manufacturing will be discussed.