Determination of hydrogen diffusivity and permeability in W near room temperature applying a tritium tracer technique
Determination of hydrogen diffusivity and permeability in W near room temperature applying a tritium tracer technique
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DOI：
10.1016/j.jnucmat.2010.12.007
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发表时间：
2011-08
影响因子：
3.1
通讯作者：
T. Ikeda;T. Otsuka;T. Tanabe
中科院分区：
文献类型：
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作者：
T. Ikeda;T. Otsuka;T. Tanabe
钨具有良好的热性能和低腐蚀性，是ITER等离子体表面材料的主要候选材料。但在ITER工作温度附近（低于500K），氢的溶解度和扩散率的研究却很少。主要是因为其在较低温度下的低氢溶解度和扩散性使得氢的检测相当困难。我们试图观察氢等离子体驱动渗透（PDP）通过镍和钨近室温应用氚示踪技术，这是非常敏感的检测稀释在氢中的氚。PDP的表观扩散系数由第一时间的渗透滞后时间确定，并且镍和钨的表观扩散系数与气体驱动渗透（GDP）的表观扩散系数相似或大几倍。PDP在镍和钨中的渗透率比标准化为相同气压的GDP的渗透率分别大约20倍和5倍。
Tungsten is a primary candidate of plasma facing material in ITER and beyond, owing to its good thermal property and low erosion. But hydrogen solubility and diffusivity near ITER operation temperatures (below 500K) have scarcely studied. Mainly because its low hydrogen solubility and diffusivity at lower temperatures make the detection of hydrogen quite difficult. We have tried to observe hydrogen plasma driven permeation (PDP) through nickel and tungsten near room temperatures applying a tritium tracer technique, which is extremely sensible to detect tritium diluted in hydrogen. The apparent diffusion coefficients for PDP were determined by permeation lag times at first time, and those for nickel and tungsten were similar or a few times larger than those for gas driven permeation (GDP). The permeation rates for PDP in nickel and tungsten were larger than those for GDP normalized to the same gas pressure about 20 and 5 times larger, respectively.