Analysis of hydrogen mobility in Nb-based alloy membranes in view of new description of hydrogen permeability based on hydrogen chemical potential

JOURNAL OF ALLOYS AND COMPOUNDS

卷:645

Article; Proceedings Paper

Suzuki, A.¹  Yukawa, H.¹  Nambu, T.²  Matsumoto, Y.³  Murata, Y.¹ 

[1] Nagoya Univ, Grad Sch Engn, Dept Mat Sci & Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan

[2] Suzuka Natl Coll Technol, Dept Mat Sci & Engn, Shiroko, Mie 5100294, Japan

[3] Oita Natl Coll Technol, Dept Mech Engn, Oita 8700152, Japan

关键词: Hydrogen permeation;    Hydrogen chemical potential;    Hydrogen diffusivity;    Pressure-composition-isotherm;    Nb-based alloy membrane;   

DOI  :  10.1016/j.jallcom.2014.12.265

来源: Elsevier

【 摘 要 】

Hydrogen permeability of Nb-based alloy membranes have been analyzed in view of the new description of hydrogen permeation based on hydrogen chemical potential in order to investigate the alloying effects on the mobility of hydrogen atom, B. There is a liner relationship between the normalized hydrogen flux, J.L, and the PCT factor, f(PCT). The mobility of hydrogen atom is expressed in a format of the Arrhenius equation. Then, the alloying effects on the activation energy, E, and the pre-exponential factor, B-0, have been investigated. It is found that logarithm of the pre-exponential factor, lnB(0), is proportional to the activation energy, E. In other words, when one factor decreases by alloying, the other factor also decreases linearly. As a result, the addition of ruthenium, tungsten and molybdenum into niobium enhances the hydrogen diffusivity at low temperature below the intersection temperature, T-int. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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