Abstract
Palladium (Pd) and its alloys are industrially used for separation and purification of hydrogen gas. However, Pd is too expensive and a rare natural resource, so that the development of non-Pd based hydrogen permeation alloys is strongly desired. The present authors have found out that high hydrogen permeability (Φ) is compatible with resistance against the hydrogen embrittlement in the Nb-TiNi alloys consisting of the bcc-(Nb, Ti) and the B2-TiNi phases. The value of Φ for Nb40Ti30Ni30 alloy, for example, is slightly higher than that of pure Pd. Then, in this paper, the possibility of substitution of these alloys for the Pd based hydrogen permeation alloys is discussed based on the experimental data, the prices of the metals and so on.
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