Journal Article

FZJ-2022-05226

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Progress in the Realization of µ-Brush W for Plasma-Facing Components

Dorow-Gerspach, D. (Corresponding author)FZJ* ; Derra, T. ; Gipperich, M. ; Loewenhoff, T.FZJ* ; Pintsuk, G.FZJ* ; Terra, A.FZJ* ; Weber, T. ; Wirtz, M.FZJ* ; Linsmeier, C.FZJ*

2022
MDPI Basel

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Please use a persistent id in citations: http://hdl.handle.net/2128/32843  doi:10.3390/jne3040020

Abstract: During the service life of plasma-facing components, they are exposed to cyclic stationary and transient thermal loads. The former causes thermal fatigue and potentially detachment between the plasma-facing material tungsten and the structural Cu-based materials (divertor) and steel (first wall). The latter causes surface roughening, cracking, or even melting, which could drastically increase the erosion rate. Employing thin flexible W wires (Ww) with a diameter of a few hundred µm can reduce mechanical stresses, and we demonstrated their crack resilience against transient loads within first proof of principle studies. Here, status and future paths towards the large-scale production of such Ww assemblies, including techniques for realizing feasible joints with Cu, steel, or W, are presented. Using wire-based laser metal deposition, we were able to create a homogeneous and shallow infiltration of about 200 µm of the Ww assembly with steel. A high-heat-flux test on such a µ-brush (10 × 10 × 5 mm3 Ww on a ~0.5 mm thick steel layer) using 5 MW/m2 for 2000 cycles was performed without loss of any wire. Microstructural examination after and infrared analysis during the test showed no significant signs of degradation of the joint

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Contributing Institute(s):

1. Plasmaphysik (IEK-4)

Research Program(s):

1. 134 - Plasma-Wand-Wechselwirkung (POF4-134) (POF4-134)

Appears in the scientific report 2022

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Database coverage:
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