Journal Article

FZJ-2020-02559

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Tungsten nitride as tritium permeation barrier

Houben, A. (Corresponding author)FZJ* ; Rasiński, M.FZJ* ; Gao, L.FZJ* ; Linsmeier, C.FZJ*

2020
Elsevier Amsterdam [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/25291  doi:10.1016/j.nme.2020.100752

Abstract: The development and application of robust tritium permeation barrier coatings is crucial for a safe and economic fusion reactor operation. Three different tungsten and tungsten nitride layers on Eurofer97 substrates were investigated by deuterium permeation measurements and compared. The microstructure and crystal structure was characterized before and after permeation measurements. The layer permeability is independent of the layer thickness and substrate of the sample. For a reliable comparison of different tritium permeation barrier coatings, the layer permeability of each layer was calculated. With this layer permeability, the permeation flux through potential fusion device components can be estimated. As examples, the permeation flux through a 0.5 cm thick steel component can be reduced by two orders of magnitude by a 2 m thick WN layer and nearly four orders of magnitude by a 2 m non-cracked tungsten layer.

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Contributing Institute(s):

1. Plasmaphysik (IEK-4)

Research Program(s):

1. 113 - Methods and Concepts for Material Development (POF3-113) (POF3-113)

Appears in the scientific report 2020

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