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High Hydrogen Permeability in Nb-Ti-Ni Eutectic Alloys Containing Much Primary (Nb, Ti) Phase

Published online by Cambridge University Press:  01 February 2011

Kazuhiro Ishikawa ,
Weimin Luo  and
Kiyoshi Aoki
Kazuhiro Ishikawa
Affiliation:
[email protected], Kitami Institute of Technology, Materials Science, Koen-cho 165, Kitami, Hokkaido, 090-8507, Japan
Weimin Luo
Affiliation:
[email protected], Kitami Institute of Technology, Graduate student, Japan
Kiyoshi Aoki
Affiliation:
[email protected], Kitami Institute of Technology, Materials Science, Japan
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Abstract

Microstructure, crystal structure and hydrogen permeability (Φ) of Nb-Ti-Ni alloys on the straight line connecting the compositions of the eutectic and the primary (Nb, Ti) phase have been investigated to develop the alloys showing high hydrogen permeability with a scanning electron microscope (SEM), an X-ray diffractometer (XRD), and a gas permeation apparatus, respectively. These alloys consist of the B2-TiNi compound and the bcc- (Nb, Ti) solid solution and are hydrogen permeable when they contain much amount of the eutectic phase. The values of Φ for these alloys increase with increasing temperature and Nb content. The Nb68Ti17Ni15 alloy shows the highest Φ of [molH2m−1s−1Pa−0.5] at 673 K, which is 3.1 times higher than that of pure Pd. The present work demonstrates that the alloys showing the high Φ values are obtained on the straight line connecting the compositions of the eutectic and the primary phase.

Keywords

hydrogenationpurificationmicrostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 885: Symposium A – The Hydrogen Cycle – Generation, Storage and Fuel Cells , 2005 , 0885-A09-61
Copyright
Copyright © Materials Research Society 2006

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References

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