Influence of Oxygen on Permeation of Hydrogen Isotopes Through Group 5 Metals
Influence of Oxygen on Permeation of Hydrogen Isotopes Through Group 5 Metals
复制标题
氧对氢同位素渗透 5 族金属的影响
DOI：
10.13182/fst08-a1869
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
M. Matsuyama
中科院分区：
文献类型：
--
作者：
Y. Hatano;A. Busnyuk;V. Alimov;A. Livshits;Y. Nakamura;M. Matsuyama
摘要 第 5 族金属（V、Nb 和 Ta）是用于从 Pb-17Li 液层系统中回收氚的真空渗透器中管材料的潜在候选材料。从这个角度来看，在高温下的超高真空装置中研究了氧对氢对V和Ta的表面反应速率的影响，并将结果与先前研究中获得的Nb数据进行了比较。正如之前在 Nb 中观察到的那样，V 和 Ta 上氢的表面反应速率以及因此的渗透速率随着本体中氧浓度的增加而降低。这些观察结果归因于表面氧覆盖率随着本体氧浓度的增加而增加。观察到氧对 V 的氢渗透速率影响最弱。然而，由于 V 在 V 中的氧溶解度较高，因此在典型覆盖层条件下通过 V 的预期渗透速率不一定很高。评估表明，在典型覆盖层条件下，使用 Nb 应获得最高的渗透速率。
Abstract Group 5 metals (V, Nb and Ta) are potential candidates of tube material in vacuum permeator for tritium recovery from Pb-17Li liquid blanket system. From this viewpoint, the influence of oxygen on the surface reaction rates of hydrogen on V and Ta were examined in an ultra-high vacuum apparatuses at elevated temperatures, and the results were compared with the data on Nb acquired in a previous study. The surface reaction rates of hydrogen on V and Ta, and consequently permeation rates, decreased with increasing oxygen concentration in the bulk as previously observed for Nb. These observations were ascribed to the increase in surface oxygen coverage with increasing bulk oxygen concentration. The weakest influence of oxygen on hydrogen permeation rate was observed for V. The expected permeation rate through V under typical blanket conditions, however, was not necessarily high due to high oxygen solubility in V. The evaluation indicated that the highest permeation rate should be obtained with Nb under typical blanket conditions.