Hydrogen permeation of pure niobium metal in highly soluble hydrogen state
Hydrogen permeation of pure niobium metal in highly soluble hydrogen state
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DOI：
10.2320/jinstmet.69.841
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发表时间：
2005-09-01
影响因子：
--
通讯作者：
Morinaga, M
中科院分区：
文献类型：
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作者：
Nambu, T;Shimizu, N;Morinaga, M
用气体渗透技术研究了纯Nb金属中氢的渗透，主要是在高溶解氢状态下的测量。氢扩散是氢渗透反应的速率控制步骤。然而，Sieverts定律，即金属中氢的溶解度与氢气压力的平方根成正比，在473~673K的温度范围内，在氢气的进口压力为260kPa，出口压力为60kpa的实验条件下，已不再满足。这主要是由于在此条件下金属中存在大量的可溶氢。结果表明，在纯Nb中，测得的表观氢渗透率随温度的降低而单调下降。这与低溶解度状态下氢渗透率的温度依赖关系完全相反，在低溶解度状态下满足Sieverts定律。强调了在实际应用中，为了获得金属膜的一些性能数据，在高溶解度状态下测定氢的渗透是必要的。
The hydrogen permeation through pure niobium metal was investigated using a gas permeation technique, focusing mainly on the measurements in a highly soluble hydrogen state. The hydrogen diffusion was found to be the rate-determining step for the hydrogen permeation reaction. However, the Sieverts law that the hydrogen solubility in a metal is proportional to the square root of hydrogen pressure, was no longer satisfied in the experimental condition of the temperatures of 473 K to 673 K and the applied pressures of 260 kPa at the inlet and 60 kPa at the outlet for hydrogen. This was mainly due to the presence of a large amount of soluble hydrogen in the metal under this condition. As a result, the measured apparent hydrogen permeability decreased monotonously with decreasing temperature in pure niobium. This was completely the reverse of the temperature dependence of the hydrogen permeability in the low solubility state where the Sieverts law was satisfied. It was stressed here that the permeation measurement of hydrogen in the high solubility state was indeed necessary for getting some performance data of metal membranes in practical use.