Hydrogen Dilatation of V-Based Composite Membranes

Archives of Metallurgy and Materials

article

A. Panichkin¹  A. Mamaeva¹  A. Kenzhegulov¹  Z. Karboz¹ 

[1] Satbayev University;Engineer of laboratory Metallurgical Sciences, Institute of Metallurgy and Ore Beneficiation

关键词: hydrogen dilatation;    vanadium;    composite hydrogen permeable membrane;    concentration gradient;    deformation;   

DOI  :  10.24425/amm.2022.137816

学科分类：物理（综合）

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

One of the problems limiting the use of vanadium as hydrogen permeable membranes is its high dilatation upon hydrogendissolution in it. The information available for the dilatation coefficient value (Δυ/Ω) is contradictory, experimental informationon the hydrogen solubility in vanadium within 100-1000 kPa at from 250 to 700°С is very limited. It does not enable to calculatethe membrane dilatation. The article contains the measuring results for dilatation of strips made of vanadium foil 100 μm thickin a hydrogen atmosphere in the pressure range from 75 to 1000 kPa, temperatures from 250 to 700°С. The dilatation coefficient(Δυ/Ω) of polycrystalline vanadium was calculated based on the data obtained for dilatation and data previously published for thehydrogen concentration in the α-solid solution at 400°С. It is 0.165. Isobars for the temperature dependence of the hydrogen concentration in vanadium are calculated and constructed using the dilatation measuring results and the dilatation coefficient values.These data are agreed with theoretical and experimental data published previously. The limiting change in concentration and lineardimensions over the cross section of a hydrogen-permeable membrane from V was estimated at various temperatures and operatingpressures at the membrane outlet based on the isobars plotted for temperature dependences of the CH/V. The conclusions are madeon the optimal working conditions of Pd/V/Pd membranes when hydrogen is released from hydrogen-containing gas mixtures inaccordance with Fick’s 1st law and data published previously for hydrogen concentration value at which solid hydrogen solutionsin vanadium become brittle.

【 授权许可】

CC BY-NC