Abstract
As a hydrogen storage material, Zr2Fe alloy has many advantages such as fast hydrogen absorption speed, high tritium recovery efficiency, strong anti-pulverization ability, and difficulty self-igniting in air. Zr2Fe alloy has lower hydrogen absorption pressure at room temperature than LaNi5 alloy. Compared with the ZrVFe alloy, the hydrogen release temperature of Zr2Fe is lower so that the material can recover hydrogen isotopes at lower hydrogen concentration efficiently. Unfortunately, the main problem of Zr2Fe alloy in application is that a disproportionation reaction is easy to occur after hydrogen absorption at high temperature. At present, there is little research on the generation and influencing factors of a disproportionation reaction in Zr2Fe alloy. In this paper, the effects of temperature and hydrogen pressure on the disproportionation of Zr2Fe alloy were studied systematically. The specific activation conditions and experimental parameters for reducing alloy disproportionation are given, which provide a reference for the specific application of Zr2Fe alloy.
Highlights
A tritium safety containment system plays an important role in the fusion reactors
Zr2 Fe alloy has the advantages of fast hydrogen absorption rate and high absorption efficiency
Hara et al [11] carried out a lot of research on the hydrogen disproportionation reaction of Zr2 M series alloys, and found that
Summary
A tritium safety containment system plays an important role in the fusion reactors. The recovery of tritium from tailed helium gas is an indispensable technology for the efficient use of tritium. Zr2 Fe alloy has the advantages of fast hydrogen absorption rate and high absorption efficiency. Compared with those of the high concentration hydrogenation materials [6,7,8,9], the equilibrium pressure at room temperature is around 10−6 Pa for Zr2 Fe alloy [10]. The Zr-based alloy is easy to disproportionate during high-temperature operation, which greatly reduces the storage capacity of the alloy, and is not conducive to repeated cycle applications. When the temperature is raised to 773 K, the disproportionation reaction of this alloy proceeds very quickly, and the ZrH2 phase is formed within minutes. Prone to disproportionation pressure are the most commonly used and system control in applications, but are rarely after hydrogen absorption.
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