Development of multilayer coatings for tritium permeation barrier in fusion blankets

氚在聚变反应堆包层结构材料中的渗透是最关键的问题之一，因为它可能导致燃料损失和其他辐射危害。为了进一步探讨多层膜的渗透和腐蚀行为，本文对Er2O_3和Er2O_3-金属(双层)涂层进行了氚渗透实验和锂铅相容性实验。涂层的渗氢实验表明，表面氧化金属层对涂层的渗透率有影响，表明陶瓷-金属结构的分层可以获得较高的渗透折减系数和可靠性。配伍性试验表明，Er2O3Fe涂层的腐蚀速率低于Er2O3涂层。

Tritium permeation through structural materials at fusion reactor blankets is one of the most crucial issues because it can lead to loss of fuel and other radiological hazards. In this study, deuterium permeation experiments and lithium-lead compatibility tests have been performed on Er2O3 and Er2O3-metal (two-layer) coatings to further the discussion of permeation and corrosion behaviors on multilayer coatings. Deuterium permeation of the coatings showed that surface-oxidized metal layer influenced permeability, indicating that higher permeation reduction factors and reliability can be obtained by layering ceramic-metal structures. Compatibility tests proved that thecorrosion rate of the Er2O3-Fe coatings was lower than that of the Er2O3 coatings.