TY  - JOUR
AU  - Dorow-Gerspach, Daniel
AU  - Derra, Thomas
AU  - Gipperich, Marius
AU  - Loewenhoff, Thorsten
AU  - Pintsuk, Gerald
AU  - Terra, Alexis
AU  - Weber, Thomas
AU  - Wirtz, Marius
AU  - Linsmeier, Christian
TI  - Progress in the Realization of µ-Brush W for Plasma-Facing Components
JO  - Journal of nuclear engineering
VL  - 3
IS  - 4
SN  - 2673-4362
CY  - Basel
PB  - MDPI
M1  - FZJ-2022-05226
SP  - 333 - 341
PY  - 2022
AB  - 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
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001188964400001
DO  - DOI:10.3390/jne3040020
UR  - https://juser.fz-juelich.de/record/911996
ER  -