A Study on Hydrogen Transport in Liquid Metals under Steady State Plasma Bombardment

Abstract

Hydrogen Plasma-driven Permeation (PDP) experiments through two different liquid metal membranes: lithium and GaInSn have been conducted in the temperature range from 300 to 500 • C. A technique employing a mesh sheet to hold a liquid metal for PDP has been utilized for the first time. It has been found that PDP is surface recombination limited for lithium and is diffusion limited for GaInSn. Hydrogen surface recombination coefficients for liquid lithium and hydrogen diffusivity in GaInSn have been obtained respectively.

Gas- and plasma-driven hydrogen permeation behavior of stagnant eutectic-solid GaInSn/Fe double-layer structure

“…After continuously proceeding for t 2 (20 s-25 s), the permeation curve maintains stability. Figure 7 reveals that as the temperature rises from 579 K to 664 K, t 2 shows slight degradation, and hydrogen permeation flux increases from 7.7×10 13 In this work (α Fe) Kalsavtov (F82H) [31] Diffusivity (cm 2 Ss -1 )…”

“…1 GaInSn is a low-temperature liquid metal alloy, which is compatible to a variety of metals within a wide temperature range. [13] Hence it was considered as a good modeling material to study the properties of liquid metals. The composition of liquid GaInSn selected in this experiment was 67% gallium, 20.5% indium, and 12.5% tin, and its melting point was 10.5 • C. Its other physical properties are shown in Table 1.…”

“…The number of particles returning rapidly to the plasma depends on the incident energy of the incoming particle and the type of material. [8] The ions are trapped in the implant zone in the form of hydrogen atoms. The implant zone is composed of various defects.…”

“…Hence the design of a fusion reactor requires a comprehensive and systematic understanding of the hydrogen isotopes recycling and retention in PFCs during operation. [8] Generally, hydrogen isotopes exist in the gaseous state and plasma state in fusion reactors. Therefore, its transport properties in PFCs should be considered from two different permeation approaches: one is gas-driven permeation (GDP), and the other is plasma-driven permeation (PDP).…”

“…Zhou et al [9,12] studied GDP and PDP through a reduced activation solid F82H membrane. The PDP of hydrogen isotopes in liquid metals such as Ga, Li, and GaInSn was discussed by Bi et al, [13] and Bi and Hirooka. [14][15][16] A mesh sheet was firstly proposed to hold a liquid metal in their work.…”