Hydrogen permeability, thermal stability and hydrogen embrittlement of Ni–Nb–Zr and Ni–Nb–Ta–Zr amorphous alloy membranes

Paglieri, Stephen N.; Pal, Narendra; Dolan, Michael D.; Kim, Sang‐Mun; Chien, Wen‐Ming; Lamb, Joshua; Chandra, Dhanesh; Hubbard, Kevin M.; Moore, D. P.

doi:10.1016/j.memsci.2011.04.049

Cited by 78 publications

(28 citation statements)

References 58 publications

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“…The Pd overlayer can influence thermal stability of the membrane, as inter-diffusion of Pd into the Ni-based alloy ribbons was observed in our studies [47] as well as by Buxbaum [48]. This diffusion can degrade the surface activity and can lead to the formation of impermeable compounds at the interface.…”

Section: Catalytic Dissociation Of Hydrogen Molecules By Pd and Nsupporting

confidence: 68%

“…Paglieri et al [47] examined Ni40Nb20Zr20, (Ni0.60Nb0.40)100-xZrx and (Ni0.60Nb0.40Ta0.1)100-xZrx (x = 0 to 30 at.%) alloys, finding that hydrogen solubility and permeability increased, while the fracture resistance decreased, with increasing Zr content. Ta addition decreased hydrogen permeability relative to the equivalent Ta-free alloys, but also increased the thermal stability.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Developments in the Ni–Nb–Zr amorphous alloy membranes

et al. 2016

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Most of the global H2 production is derived from hydrocarbon-based fuels, and efficient H2/CO2 separation is necessary to deliver a high purity H2 product. Hydrogen-selective alloy membranes are emerging as a viable alternative to traditional pressure swing absorption processes as a means for H2/CO2 separation. These membranes can be formed from a wide range of alloys, and those based on Pd are the closest to commercial deployment. The high cost of Pd (USD ~31,000 kg -1 ), however, is driving the development of less-expensive alternatives, including inexpensive amorphous (Ni60Nb40)100-xZrx alloys. Amorphous alloy membranes can be fabricated directly from the molten state into continuous ribbons via melt spinning, and depending on the composition, can exhibit relatively high hydrogen permeability between 473 and 673 K. Here we review recent developments in these low-cost membrane materials, especially with respect to permeation behavior, electrical transport properties, and understanding of local atomic order. In a quest to further understand the nature of these solids, atom probe tomography has been performed, revealing amorphous Nb-rich and Zr-rich clusters embedded in, majority Ni matrix, whose compositions deviated from the nominal overall composition of the membrane.

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Section: Catalytic Dissociation Of Hydrogen Molecules By Pd and Nsupporting

confidence: 68%

Section: Mechanical Propertiesmentioning

confidence: 99%

Developments in the Ni–Nb–Zr amorphous alloy membranes

et al. 2016

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“…These initial alloys are crystalline and need further processing to become amorphous. Indeed, subsequently, the buttons were used to fabricate the amorphous membranes by means of a melt spinning apparatus at the CSIRO laboratory, Brisbane, Australia [26]. In the melt spinning apparatus, the alloys are melted and are, subsequently, extruded onto a copper wheel, cooled by water.…”

Section: Methodsmentioning

confidence: 99%

“…The rapid solidification, occurring with a temperature rate of the order of ∆T/∆t~10 5 • C·s −1 , produces an amorphous state for the alloys. These amorphous ribbons have typical thickness of~30-70 µm and a width of~30 mm [26], and are those investigated throughout the paper. Only in the case of a specimen of (Ni 0.6 Nb 0.4 ) 70 Zr 30, recrystallization was obtained by means of a thermal treatment of an amorphous sample in a thermogravimetric apparatus, a Setaram Sensys Evolution 1200 TGA system (Setaram Instrumentation, Caluire, France), heating to 700 • C in a pure argon atmosphere (60 mL/min), using a temperature scanning rate of 10 • C/min.…”

Section: Methodsmentioning

confidence: 99%

New Studies of the Physical Properties of Metallic Amorphous Membranes for Hydrogen Purification

et al. 2017

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Amorphous metallic membranes display promising properties for hydrogen purification up to an ultrapure grade (purity > 99.999%). The hydrogen permeability through amorphous membranes has been widely studied in the literature. In this work we focus on two additional properties, which should be considered before possible application of such materials: the propensity to crystallize at high temperatures should be avoided, as the crystallized membranes can become brittle; the hydrogen solubility should be high, as solubility and permeability are proportional. We investigate the crystallization process and the hydrogen solubility of some membranes based on Ni, Nb, and Zr metals, as a function of Zr content, and with the addition of Ta or B. The boron doping does not significantly affect the crystallization temperature and the thermal stability of the membrane. However, the hydrogen solubility for p~7 bar is as high as H/M~0.31 at T = 440 • C and H/M~0.27 at T = 485 • C. Moreover, the membrane does not pulverize even after repeated thermal cycles and hydrogenation processes up to 485 • C and 7 bar, and it retains its initial shape.

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“…Amorphous metallic alloy ribbons were exhaustively studied because of its capability to storing hydrogen and membrane application [1][2][3] . Regardless of the composition, amorphous alloys exhibit large amount of sites for hydrogen absorption, but many of this sites have high occupancy energy so the hydrogen diffusivity in these materials is always lower than the corresponding crystalline alloys.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen gas permeation through amorphous and partially crystallized Fe40Ni38Mo4B18

Ribeiro¹,

Lemus²,

Santos³

2012

Mat. Res.

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gas permeation from 523 to 643 K. The hydrogen permeation curves exhibited a single sigmoidal shape, typical of tests where no hydride formation occurs. It was observed that the hydrogen diffusivity increases for the amorphous samples and partially crystallized alloy with the temperature increase. The hydrogen diffusion coefficient as a function of temperature was found to be D = 5.1 ± 0.5 × 10 -12 exp (-11.0 ± 3.5/RT) (m ) for the partially crystallized condition. This suggests that the annihilation of defects in the amorphous structure and the crystalline phase precipitate contributes to the increase of the hydrogen diffusion.

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Hydrogen permeability, thermal stability and hydrogen embrittlement of Ni–Nb–Zr and Ni–Nb–Ta–Zr amorphous alloy membranes

Cited by 78 publications

References 58 publications

Developments in the Ni–Nb–Zr amorphous alloy membranes

Developments in the Ni–Nb–Zr amorphous alloy membranes

New Studies of the Physical Properties of Metallic Amorphous Membranes for Hydrogen Purification

Hydrogen gas permeation through amorphous and partially crystallized Fe40Ni38Mo4B18

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