Abstract With the method of gas-driven permeation, a series of permeation experiments was carried out using Hastelloy N alloy membrane in an elevated temperature range of 400°C to 800°C with different hydrogen isotopes. A complete set of permeability, diffusivity, and Sieverts’ constant for hydrogen and deuterium in Hastelloy N alloy was successfully obtained. The isotope effect in the diffusion process was analyzed and compared with references. The ratios of diffusive transport parameters for hydrogen and deuterium were a permeability ratio of ФH/ФD = 1.32exp(0.34kJ/RT), a diffusivity ratio of DH/DD = 1.15exp(−0.41kJ/RT), and a Sieverts’ constant ratio of KS,H/KS,D = 1.16exp(0.21kJ/RT). The result that the permeation flux of deuterium was decreased after introducing hydrogen could be used to suppress the permeation of tritium in future tritium control of the Fluoride-salt-cooled High-temperature Reactor (FHR). Compared with NiO, the Cr2O3 formed in the surface oxidation layer of Hastelloy N alloy showed better hydrogen permeation barrier performance after baking above 700°C in air.

中文翻译：

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用于氟化盐冷却高温反应堆 (FHR) 的哈氏合金 N 合金中氢同位素的扩散表征

摘要 采用气体驱动渗透法，采用Hastelloy N合金膜，在400～800℃的高温范围内进行了一系列不同氢同位素的渗透实验。成功获得了一套完整的Hastelloy N合金中氢和氘的渗透率、扩散率和西弗兹常数。分析了扩散过程中的同位素效应，并与参考文献进行了比较。氢和氘的扩散输运参数比为 ФH/ФD = 1.32exp(0.34kJ/RT)、DH/DD = 1.15exp(-0.41kJ/RT) 和 Sieverts' KS,H/KS,D 的恒定比率 = 1.16exp(0.21kJ/RT)。引入氢气后氘渗透通量降低的结果可用于抑制氟化盐冷却高温反应堆（FHR）氚控制中的氚渗透。与NiO相比，Hastelloy N合金表面氧化层中形成的Cr2O3在空气中700℃以上烘烤后表现出更好的氢渗透阻隔性能。