Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 20: Plasma Wall Interaction II - Poster
P 20.2: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Zelt West
Development of a Methode to Determine the Crystal Surface Orientation Dependenc of Tungsten oxidation — •Karsten Schlüter1,2, Martin Balden1, and Tiago Fiorini da Silva3 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany — 2Fakultät für Maschinenwesen, Technische Universität München, D-85748, Garching, Germany — 3Physics Institute of University of São Paulo - Rua do Matão, trav. R 187, 05508-090 São Paulo, Brazil
The crystal orientation influences the properties of tungsten (W), thus affecting their performances in applications like fusion plasma devices. In this regard, it will be necessary to study the dependency of W properties (e.g. oxidation resistance or sputtering) on its crystal orientation to probably optimize the texture of the material. To evaluate a crystal orientation analyses for all, the low and high index surfaces, a measuring method was developed.
The grain orientations on a polycrystalline W sample were analyzed using electron backscatter diffraction. Subsequently, the samples were oxidized in a thermobalance, measuring the time dependent weight increase. The grain dependent oxidation rates were determined by measuring the thickness of the oxide layer of single grains by scanning electron microscope and confocal laser scanning microscope. W grains with {100} orientation have the highest and a two times higher oxidation rate in a range of 720 K to 870 K than to the lowest oxidation rates, e.g. like the oxidation rate of the {111} orientation. The high index surfaces are visualized in an inverse pole figure (IPFz).