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Cold Sprayed Tungsten Armor for Tokamak First Wall

2019; Multidisciplinary Digital Publishing Institute; Volume: 9; Issue: 12 Linguagem: Inglês

10.3390/coatings9120836

2079-6412

Jan Čížek, Monika Vilémová, František Lukáč, Martin Koller, Jan Kondás, Reeti Singh,

Nuclear Materials and Properties

Harnessing nuclear fusion is a challenging task, in particular because of the demands put on the used materials. In tokamaks, future energy sources, the inner-most chambers are to be coated with dense coatings of W, or W-Cr-based alloys. So far, the attempts for such coatings formation by other methods failed due to oxidation, high porosity, insufficient adhesion, high specific surface, or even insufficient thickness below 10 μ m. Cold spraying seems a promising technology for the task. In our study, we demonstrate the first successful fabrication of thick pure W coatings. W-Cr and W-Cr-Ti coatings were further prepared without oxidation of the metals. All coatings exhibited high hardness levels, good interface quality with three tested substrates and, importantly, a promising potential for formation of stable Cr 2 WO x phases.