Manufacturing of W-steel joint using plasma sprayed graded W/steel-interlayer with current assisted diffusion bonding

0548877 - ÚFP 2022 RIV CH eng J - Journal Article
Ganesh, V. - Dorow-Gerspach, D. - Heuer, S. - Matějíček, Jiří - Vilémová, Monika - Bram, M. - Coenen, J.W. - Wirtz, M. - Pintsuk, G. - Theisen, W. - Linsmeier, Ch.
Manufacturing of W-steel joint using plasma sprayed graded W/steel-interlayer with current assisted diffusion bonding.
Fusion Engineering and Design. Roč. 172, November (2021), č. článku 112896. ISSN 0920-3796. E-ISSN 1873-7196
R&D Projects: GA ČR(CZ) GA17-23154S
EU Projects: European Commission(XE) 633053 - EUROfusion
Grant - others:AV ČR(CZ) StrategieAV21/2
Program: StrategieAV
Institutional support: RVO:61389021
Keywords : Functionally graded material * Plasma spraying * Spark plasma sintering * W-steel joint
OECD category: Materials engineering
Impact factor: 1.905, year: 2021
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0920379621006724?via%3Dihub

The differences in the thermophysical properties between tungsten and steel create thermal stress peaks at its interface when joined directly for the breeding blanket of a fusion reactor. In order to solve this problem, a graded interlayer made of several layers of W/steel-composites is considered to reduce these stress peaks. Plasma spraying under an argon shrouded chamber was employed as a cost efficient manufacturing technique for such composites and field assisted sintering technology/spark plasma sintering was used to diffusion bond them with bulk-W and bulk-steel. Firstly, thermophysical characterizations were performed on these composites. Secondly, two approaches have been investigated to join bulk-W and 75 vol% W composite: direct joining and using a vanadium foil. Only vanadium foil resulted in successful bond formation at all the three bonding temperatures of 800 °C, 900 °C and 1000 °C. Thirdly, investigation of diffusion bonding parameters (temperature and time) for the joining of 25 vol% W, 50 vol% W, 75 vol% W and bulk-steel were studied and optimum process parameter were identified. Finally, this optimized parameter (1000 °C, 30 min) was employed to manufacture a complete 12 mm x 12 mm W-steel joint consisting of this graded interlayer.
Permanent Link: http://hdl.handle.net/11104/0324918