München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.83: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Investigating H-retention in tungsten fiber reinforced tungsten composites by using single-layered model systems — •Annemarie Kärcher1,2, Johann Riesch2, Armin Manhard2, Pirmin Almanstötter2,3, and Rudolf Neu1,21Technische Universität München, München, Deutschland — 2Max-Planck-Institut für Plasmaphysik, Garching, Deutschland — 3Universität Augsburg, Augsburg, Deutschland

Tungsten fiber reinforced tungsten (Wf/W) composites are pseudo-ductile materials, that use extrinsic toughening mechanisms to mitigate the brittleness of W. Due to their composite structure, many new aspects of hydrogen isotope (e.g. deuterium (D)) retention may arise. For a better understanding of hydrogen retention in Wf/W composites, single-layered model systems consisting of one layer of long parallel W fibers with a diameter of 150μm are studied. The fibers are coated by an Er2O3-interface and embedded in a thick CVD-W matrix. To investigate the influence of the matrix, fiber and the interface in between, the samples are prepared in a way that the fiber layer is located at various distances to the surface. In order to load the samples with D, they are exposed to a D plasma for 72 hours. The microstructure is characterized by means of electron microscopy before and after this exposure. The D concentration is measured first by nuclear reaction analysis, giving a depth profile of up to 8μm below surface, followed by thermal desorption spectroscopy, which yields the total retention. The results will be used to understand determining mechanism and define the next steps of retention studies of bulk Wf/W composites.

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