摘要
液态金属锂中杂质氢或氢同位素的去除通常利用热阱吸附的方法实现,金属钇作为吸气剂材料,其表面氧化膜对除氢效率的影响至关重要。本文针对氢热阱吸气剂材料金属钇,建立了基于菲克定律的一维平板扩散模型,初步获得了金属钇平板径向上随时间的氢浓度分布,并进行了不同表面状态对金属钇除氢性能的影响试验。结果显示金属钇表面无氧化层时能够在短时间内将容器内氢浓度降低至初始浓度的一半;表面存在氧化层的金属钇在常温条件下或未经高温激活的条件下,其氢吸收能力极弱,Y_(2)O_(3)层将阻碍氢分子在金属钇晶体表面发生的离解作用,从而完全杜绝氢进一步向晶体内部扩散。当温度上升至450 K以上时,能够在一定程度上重新激活表面存在氧化层的金属钇的氢吸收能力。
The removal of impurity hydrogen or hydrogen isotopes from liquid lithium metal is usually realized by using hot-trap adsorption,and yttrium metal,as a sorbent material,has a crucial influence of its surface oxide film on the hydrogen removal efficiency.In this paper,for the hydrogen hot-trap sorbent material yttrium metal,a one-dimensional plate diffusion model based on Fick’s law was established,the hydrogen concentration distribution with time on the radial direction of yttrium metal plate was preliminarily obtained,and experiments were carried out to test the influence of different surface states on the hydrogen removal performance of yttrium metal.The results show that when there is no oxide layer on the surface of yttrium metal,the hydrogen concentration in the container can be reduced to half of the initial concentration within a short period of time;under the condition of yttrium metal with an oxide layer on the surface at room temperature or without high-temperature activation,the hydrogen absorption capacity is extremely weak,and the Y_(2)O_(3) layer will hinder the dissociation of hydrogen molecules on the surface of yttrium metal,thus completely preventing the hydrogen from further diffusing into the interior of the crystals.When the temperature rises above 450 K,the hydrogen absorption capacity of yttrium metal with an oxidized layer on the surface can be reactivated to a certain extent.
作者
阿不都赛米·亚库甫
姚泽文
王荣东
朴君
王洋
Abudusaimi Yakufu;Yao Zewen;Wang Rongdong;Piao Jun;Wang Yang(China Institute of Atomic Energy,Beijing 102413,China)
出处
《核安全》
2024年第5期57-63,共7页
Nuclear Safety
基金
中国原子能科学研究院反应堆工程技术研究所所长基金科研项目(218241)。
关键词
热阱
杂质去除
氧化膜
高温激活
hot trap
impurity removal
oxide film
High temperature activation
