Hydrogen Permeation of the Melt-Spun Ni–X–Zr Amorphous Membranes

Abstract

The Ni_70−x⁄2Nb_30−x⁄2Zr_x (x=10, 20, 30, 40 and 60 at%) amorphous alloys were prepared by the melt-spinning technique. The hydrogen permeability of those alloys was compared to derive the principles of the element addition. As the result, it was found that the hydrogen permeability of the Ni–Nb–Zr ternary amorphous alloys increases with increasing Zr content. However, the hydrogen permeation of the Ni₄₀Zr₆₀ binary amorphous alloy was much smaller than that of the Ni₅₀Nb₁₀Zr₄₀ amorphous alloy. This behavior indicates that the Nb addition also improves the hydrogen permeability.
Then, as a next step, we prepared the Ni–X–Zr (X=Y, Ti, Hf, V, Nb and Ta) amorphous alloys to investigate the effect of the additional elements on the hydrogen permeation of melt-spun Ni–Zr binary amorphous alloys. As the result, it was found that the additional element with higher hydrogen affinity was preferable and that the Ni content should be reduced to improve the permeability.