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Material Improvement of Hydrogen Isotope Permeation Monitor for Liquid Lithium

Juro Yagi, Akihiro Suzuki, Takayuki Terai, Kazuyuki Nakamura, Hiroo Kondo, Mizuho Ida, Takuji Kanemura, Tomohiro Furukawa, Yasushi Hirakawa

Fusion Science and Technology / Volume 62 / Number 1 / July/August 2012 / Pages 204-209

Blanket Materials Technology / Proceedings of the Fifteenth International Conference on Fusion Reactor Materials, Part A: Fusion Technology /

Titanium plates coated by iron were fabricated electrochemically as a candidate hydrogen isotope permeation window for liquid lithium. Contacting the window to liquid lithium containing deuterium between 673 and 873 K, its permeation behavior and resistance to degradation were investigated. The iron-coated window showed less permeability than the bare titanium window as well as good agreement with the theoretical value. Furthermore, the iron layer at the vacuum side surface strongly improved oxidation resistance. Decrease of permeability for 2 hours air exposure could be recovered within 30 hours in the case of the coated window, while that of the bare titanium window could not. The coated permeation window is promising regarding high permeability and antidegradation properties.

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