Nanocrystalline Ni-based alloys and use thereof for the transpor

Details Nanocrystalline Ni-based alloys and use thereof for the transpor Nanocrystalline Ni-based alloys and use thereof for the transpor

1996-12-26

1998-06-09

Wood, Elizabeth D.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502328, 75300, 148 332, 148336, B01J 2300, B01J 2358

Patent

active

057633630

ABSTRACT:
A powder of an alloy of Ni and Mg, La, Be or Li, consisting of crystallites having a grain size lower than 100 nm and a crystalline structure allowing hydrogen absorption. This powder which is preferably obtained by mechanical grinding, may consist of cristallites of Mg.sub.2 Ni, LaNi.sub.5 or of Ni-based alloys of Be or Li having a grain size lower than 100 nm. The powder may also consist of cristallites of formula Mg.sub.2-x Ni.sub.1+x, x ranging from -0.3 to +0.3, which have a grain size lower than 100 nm, and preferably lower than 30 nm. This crystalline powder is particularly useful for storing and transporting hydrogen. Indeed, it has been discovered that such Ni-based nanocrystalline powder requires no or only one single activation treatment at low temperature to absorb hydrogen. It has also been discovered that the kinetic of absorption and diffusion of hydrogen within the powder is much faster. This can be explained by the presence of a large number of grain boundaries.

REFERENCES:
patent: 4214699 (1980-07-01), Buchner et al.
patent: 5433797 (1995-07-01), Erb et al.
Fecht et al. "Nanocrystalline Metals Prepared By High-Energy Ball Milling", Metallurgical Transactions A, vol. 21A, Sep. 1990, pp. 2333-2337.
Li et al., "A New Method For The Production of Mg-Ni Hydrogen Storage Materials", Advanced Materials, vol. 5, No. 7/8, 1993, pp. 554-555. no month available.

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