Armor W-Cr coatings for plasma-facing components in tokamaks by cold spray and RF-ICP

0543731 - ÚFP 2022 RIV US eng C - Conference Paper (international conference)
Čížek, Jan - Klečka, Jakub - Vilémová, Monika - Matějíček, Jiří - Veverka, Jakub - Mušálek, Radek - Lukáč, František - Kondás, J. - Zlatník, R.
Armor W-Cr coatings for plasma-facing components in tokamaks by cold spray and RF-ICP.
Proceedings of the International Thermal Spray Conference. Materials Park: ASM International, 2019, s. 535-540. ISBN 978-1-62708-242-6.
[International Thermal Spray Conference and Exposition: New Waves of Thermal Spray Technology for Sustainable Growth. Yokohama (JP), 26.05.2019-29.05.2019]
R&D Projects: GA ČR(CZ) GA19-14339S; GA ČR(CZ) GA17-23154S
EU Projects: European Commission(XE) 633053 - EUROfusion
Institutional support: RVO:61389021
Keywords : W-Cr * RF-ICP * tokamak
OECD category: Materials engineering

Due to its favorable properties, tungsten and its alloys are promising armor candidates for plasma-facing components in future fusion reactors such as tokamaks. The processing of PFCs via traditional methods is complicated by tungsten's inherent properties such as brittleness (high ductile-to-brittle transition temperature), CTE mismatch with structural materials used in tokamaks (Cu, steels), susceptibility to grain growth and to oxidation above 500 °C, or poor weldability and machinability. Given these factors, the attention has recently shifted from metallurgy routes to powder/additive manufacturing alternatives. In our work, two technologies are presented for consolidation of W and W-Cr layers: both cold kinetic spraying (CS) and radio frequency inductively-coupled plasma (RF-ICP) are capable of overcoming the associated production problems and fabricate the plasma-facing layers directly on structural parts, without the need for joining. Importantly, both achieve this without oxidation of the two metals. The final deposits' properties were studied using SEM, XRD, as well as mechanical and thermal analyses.
Permanent Link: http://hdl.handle.net/11104/0320894