Greifswald 2024 – scientific programme
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P: Fachverband Plasmaphysik
P 3: Plasma Wall Interaction I
P 3.6: Talk
Monday, February 26, 2024, 15:30–15:45, ELP 6: HS 3
Low Pressure Plasma Spraying of Tungsten on Plasma Facing Components for Future Fusion Devices — •Gunnar Schmidtmann1,2, Andrey Litnovsky1, Jan Willem Coenen1, Robert Vaßen2, Sebastijan Brezinsek1, Christian Linsmeier1, Olivier Guillon2, and Georg Mauer2 — 1Forschungszentrum Jülich GmbH, Institut für Energie und Klimaforschung - Plasmaphysik (IEK-4), 52425 Jülich, Germany — 2Forschungszentrum Jülich GmbH, Institut für Energie und Klimaforschung - Werkstoffsynthese und Herstellungsverfahren (IEK-1), 52425 Jülich, Germany
Tungsten is currently the baseline plasma-facing material (PFM) for future fusion devices. Despite its advantageous properties, tungsten gets damaged under the extreme plasma conditions, which can lead to a reduced lifetime of the plasma facing components (PFC) or the outage of the whole fusion reactor. As repairing is time and resource intense, Low Pressure Plasma Spraying emerges viable as a fast and affordable solution to restore the PFM and repair damages. Pre-heating of the different substrate materials: Carbon fibre composite, tungsten and Eurofer (T < 740 °C), helped to mitigate residual stresses caused by the thermal mismatch between coating and substrate. Quality parameters such as porosity below 5 % and number of defects were evaluated using digital image analysis. Further characterization was performed to obtain more information on the surface roughness and a coating thickness of at least 100 *m. In future work, selected coatings will be tested under fusion-relevant conditions to obtain a lifetime prediction and to allow to infer further possible improvements.
Keywords: Low Pressure Plasma Spraying; Tungsten coatings; Plasma facing material