Fabrication of ZrO 2 coatings on ferritic steel by wet-chemical methods as a tritium permeation barrier

Y. Hatano, K. Zhang, Kenichi Hashizume

    Research output: Contribution to journalConference article

    18 Citations (Scopus)

    Abstract

    Layers of tetragonal ZrO 2 (180 nm) were prepared on the surfaces of ferritic steel specimens by dip coating and electrolytic deposition techniques. These methods were selected because of their applicability to large and complicated structures. Hydrogen permeation tests were carried out at 300-550°C, and the results were compared with those obtained in the previous study for thinner ZrO 2 coating (100 nm). Although the thickness of the present coatings was less than twice that of the previous coatings, the permeation reduction factor for the former was larger by an order of magnitude than that for the latter at/below 400°C. Tritium retention in the coatings was also measured after exposure to a deuterium-tritium mixture at 300°C. The obtained results suggest that the permeation rate was determined by transportation through defects in the coatings, and the density of defects penetrating into the coating/substrate interface was significantly reduced by an increase in coating thickness.

    Original languageEnglish
    Article number014044
    JournalPhysica Scripta T
    VolumeT145
    DOIs
    Publication statusPublished - Dec 1 2011
    Event13th International Workshop on Plasma-Facing Materials and Components for Fusion Applications, PFMC-13 and 1st International Conference on Fusion Energy Materials Science, FEMaS-1 - Rosenheim, Germany
    Duration: May 9 2011May 13 2011

    All Science Journal Classification (ASJC) codes

    • Atomic and Molecular Physics, and Optics
    • Mathematical Physics
    • Condensed Matter Physics

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