TY  - CONF
AU  - Ganesh, Vishnu
AU  - Dorow-Gerspach, Daniel
AU  - Matejicek, Jiri
AU  - Vilemova, Monika
AU  - Bram, Martin
AU  - Coenen, Jan Willem
AU  - Wirtz, Marius
AU  - Pintsuk, Gerald
AU  - Theisen, Werner
AU  - Linsmeier, Christian
TI  - High heat flux testing results of various W-FGM-steel joints
M1  - FZJ-2022-05998
PY  - 2022
AB  - For a future commercial fusion reactor the First Wall of the breeding blanket will require a joint between the structural steel and the plasma facing material tungsten. However, the difference in the coefficient of thermal expansion (CTE) between them results in thermal stresses at their interface during operation and this could result in premature failure of the joint. A functionally graded material (FGM), as an interlayer between tungsten and steel could reduce these stresses. In this study two processes, atmospheric plasma spraying (APS) and spark plasma sintering (SPS), are utilized to manufacture four different kinds of W-FGM-steel stacks: the first two include FGMs prepared by APS; W-V-75W-50W-25W-steel and W-50W-25W-steel, the other two include FGMs made by SPS; W-75W-50W-25W-steel and W-50W-25W-steel. This investigates: i) the influence of an additional V-interlayer; ii) the comparison of APS- and SPS-FGMs; and iii) the influence of FGM composition and thickness. In all these W-FGM-steel stacks, with a surface area of 12 mm x 12 mm, the thickness of each FGM sublayer (75W, 50W, 25W) is about 0.5 mm, whereas the bulk-W and bulk-steel are 3 mm thick. A sample of direct diffusion bonded W-steel joint is used as a reference. A high heat flux benchmark test was performed to investigate and compare the potential of the different joining technologies. For this, the stacks were soldered on a copper cooling module and exposed to high stationary loads at the JUDITH-2 facility. At each power level of 1 MW/m2, 2 MW/m2, 3 MW/m2 and 4 MW/m2 the samples were subjected to a component screening cycle to determine the component quality followed by up to 200 on/off cycles (30/30 s). By monitoring the surface temperature using an IR camera, the cooling capabilities of each sample and any local overheating as indication of bond failure can be determined.
T2  - 32nd Symposium on Fusion Technology
CY  - 18 Sep 2022 - 24 Sep 2022, Dubrovnik (Croatia)
Y2  - 18 Sep 2022 - 24 Sep 2022
M2  - Dubrovnik, Croatia
LB  - PUB:(DE-HGF)24
UR  - https://juser.fz-juelich.de/record/916178
ER  -