Hydrogen permeation characteristics of vanadium–aluminium alloys

Zhang, Y.; Ozaki, Tomonobu; Komaki, M.; Nishimura, Chikashi

doi:10.1016/s1359-6462(02)00218-x

Cited by 77 publications

(35 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1,2) Hydrogen permeability È of the group 5A metals such as V, Nb and Ta is much higher than that of Pd and Pd-Ag alloys, but these metals and their alloys suffer from the severe hydrogen embrittlement and can't be used as a membrane. [3][4][5][6][7][8] Recently, the present authors have discovered that the Nb-Ti-Ni alloys, consisting of the B2-TiNi compound and the bcc-(Nb,Ti) solid solution, show high È and large resistance to the hydrogen embrittlement. 9,10) Figure 1 shows the alloy compositions investigated in the previous 9) and the present works.…”

Section: Introductionmentioning

confidence: 85%

Hydrogen Permeability in Nb–Ti–Ni Alloys Containing Much Primary (Nb,Ti) Phase

2005

View full text Add to dashboard Cite

In order to develop high hydrogen permeability alloys, structural changes induced by hydrogenation, microstructures and hydrogen permeability È were investigated for samples on the straight line connecting the eutectic and the primary phase in the Nb-Ti-Ni phase diagram. È was measurable in the alloys containing much amount of the eutectic phase, indicating that the eutectic microstructure suppresses the hydrogen embrittlement. The value of È increased with increasing Nb content and the volume fraction of the primary (Nb,Ti) phase. The most Nb-rich Nb 68 Ti 17 Ni 15 alloy showed the highest È of 4:91 Â 10 À8 (mol H 2 m À1 s À1 Pa À0:5 ) at 673 K, which is 2.5 times higher than that of the Nb 39 Ti 31 Ni 30 alloy, which has been reported to be highest in the Nb-Ti-Ni alloys. The present work demonstrated that the hydrogen permeable alloys are extended on the straight line connecting the eutectic and the primary phase to the Nb-rich side in the Nb-Ti-Ni system.

show abstract

Section: Introductionmentioning

confidence: 85%

Hydrogen Permeability in Nb–Ti–Ni Alloys Containing Much Primary (Nb,Ti) Phase

2005

View full text Add to dashboard Cite

show abstract

“…È of 5A metals such as V, Nb and Ta are higher than that of Pd and Pd-Ag alloys, 4) so that they are promising for hydrogen permeation membranes. [5][6][7][8] However, they suffer from the severe hydrogen embrittlement, because high È requires large K, which results in the prominent hydrogen embrittlement. Thus, it is difficult for 5A metals to attain high J in spite of their high È.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Hydrogen Permeability of Nb-Ti-Ni Alloys with High Resistance to Hydrogen Embrittlement

et al. 2005

View full text Add to dashboard Cite

Microstructures and hydrogen permeability (È) of as-cast Nb-Ti-Ni alloys have been investigated by scanning electron microscopy (SEM) and by the gas permeation technique, respectively. The È value increases with increasing temperature and the amount of the Nb content for every alloy. In these alloys, the Nb 39 Ti 31 Ni 30 alloy, consisting of the primary bcc-(Nb, Ti) solid solution and the eutectic {(Nb, Ti)+TiNi} phase, shows the highest È, which is equivalent to that of Pd. On the other hand, the Nb 10 Ti 50 Ni 40 alloy, consisting of the primary B2-TiNi compound and the eutectic {(Nb, Ti)+TiNi} phase, shows the lowest È value among the alloys for which È is measurable. Eutectic microstructures suppress the hydrogen embrittlement, while the primary (Nb, Ti) phase contributes to the hydrogen permeation in these alloys. The present work demonstrates that duplex alloys containing eutectic microstructures are promising for hydrogen permeation membranes with high resistance to the hydrogen embrittlement.

show abstract

“…Recent work, however, has focused on Zr-, V-and Nb-based alloys and many amorphous alloys as cheaper alternatives to hydrogen separation such as Ni-Nb-Zr amorphous alloys [19], V-Al alloys [20] or V-Ni alloys [21]. The mechanism for H 2 separation by a metal membrane is often referred to as the ''solution-diffusion'' mechanism.…”

Section: Dense Metal Membranesmentioning

confidence: 99%

Materials for separation membranes in hydrogen and oxygen production and future power generation

Phair

Badwal²

2006

Science and Technology of Advanced Materials

111

View full text Add to dashboard Cite

Future fossil fuel power generation is likely to include technologies which increase process efficiency and reduce its impact on the environment, for example, CO 2 sequestration. Some of the key technologies identified for clean coal and natural gas combustion to produce power or hydrogen or both include O 2 generation/separation, H 2 and CO 2 separation. Hydrogen is considered as a potentially excellent substitute for transport fuels due to the concern over dwindling oil reserves and global warming. This paper discusses various separation processes that may be used in the industrial production of hydrogen from fossil fuels, with an emphasis on membrane separation technologies. Membrane separation has the advantage over other separation methods in that it is simple and potentially less energy intensive. Depending on the particular separation process utilised, however, the membrane materials can differ substantially. The materials used for H 2 , O 2 and CO 2 separation are discussed and the major similarities and differences between the membranes highlighted. Critical design aspects of the membrane such as multiple phase design, nano-structure control, the need for surface layers and fabrication processes are also reviewed as they represent the areas where most research and development effort is likely to be directed in the future. r

show abstract

Hydrogen permeation characteristics of vanadium–aluminium alloys

Cited by 77 publications

References 10 publications

Hydrogen Permeability in Nb–Ti–Ni Alloys Containing Much Primary (Nb,Ti) Phase

Hydrogen Permeability in Nb–Ti–Ni Alloys Containing Much Primary (Nb,Ti) Phase

Microstructures and Hydrogen Permeability of Nb-Ti-Ni Alloys with High Resistance to Hydrogen Embrittlement

Materials for separation membranes in hydrogen and oxygen production and future power generation

Contact Info

Product

Resources

About

Hydrogen permeation characteristics of vanadium–aluminium alloys

Cited by 77 publications

References 10 publications

Hydrogen Permeability in Nb&ndash;Ti&ndash;Ni Alloys Containing Much Primary (Nb,Ti) Phase

Hydrogen Permeability in Nb&ndash;Ti&ndash;Ni Alloys Containing Much Primary (Nb,Ti) Phase

Microstructures and Hydrogen Permeability of Nb-Ti-Ni Alloys with High Resistance to Hydrogen Embrittlement

Materials for separation membranes in hydrogen and oxygen production and future power generation

Contact Info

Product

Resources

About

Hydrogen Permeability in Nb–Ti–Ni Alloys Containing Much Primary (Nb,Ti) Phase

Hydrogen Permeability in Nb–Ti–Ni Alloys Containing Much Primary (Nb,Ti) Phase