Ultra-fast sintered functionally graded Fe/W composites for the first wall of future fusion reactors

Heuer, S. and Lienig, T. and Mohr, A. and Weber, T. and Pintsuk, G. and Coenen, J.W. and Gormann, F. and Theisen, W. and Linsmeier, C.

Volume: 164 Pages: 205-214
DOI: 10.1016/j.compositesb.2018.11.078
Published: 2019

Aiming at the realisation of nuclear fusion reactors, the joining of W and steel parts is currently examined. Based on proposals to implement functionally graded steel/W materials (FGMs) in the joint to cope with thermal stresses, the present contribution introduces a novel fabrication method for steel/W FGMs. Electro Discharge Sintering (EDS) was used to consolidate Fe/W powders within milliseconds at atmosphere. Due to the short process time, the formation of detrimental intermetallic Fe-W precipitates is limited compared to established fabrication methods. The current work first presents results of the Fe/W powder processing, then a feasibility study regarding the fabrication of homogeneous and graded Fe/W composites with W volume fractions of 0, 25, 50 and 75 % via EDS is presented. Lastly, the composites are characterised microstructurally, thermo-physically, and mechanically in detail. © 2018

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