Pulverulent intermetallic materials for the reversible...

C - Chemistry – Metallurgy – 01 – B

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C01B 3/00 (2006.01) B22F 9/02 (2006.01) C01B 6/24 (2006.01) C22C 1/04 (2006.01) C22C 14/00 (2006.01) C22C 27/02 (2006.01) C22C 27/06 (2006.01) H01M 4/38 (2006.01)

Patent

CA 2643241

The present invention relates to pulverulent materials suitable for storing hydrogen, and more particularly to a method of preparing such a material, in which: (A) a composite metallic material having a specific granular structure is prepared by co-melting the following mixtures: a first metallic mixture (m1), which is an alloy (a1) of body-centred cubic crystal structure, based on titanium, vanadium, chromium and/or manganese, or a mixture of these metals in the proportions of said alloy (a1); and a second mixture (m2), which is an alloy (a2), comprising 38 to 42% zirconium, niobium, molybdenum, hafnium, tantalum and/or tungsten and 56 to 60 mol% of nickel and/or copper, or else a mixture of these metals in the proportions of said alloy (a2), with a mass ratio (m2)/(m1+m2) ranging from 0.1 wt% to 20 wt%; and (B) the composite metallic material thus obtained is hydrogenated, whereby said composite material is fragmented (hydrogen decrepitation).

La présente invention concerne des matériaux pulvérulents adaptés au stockage de l'hydrogène, et plus spécifiquement un procédé de préparation d'un tel matériau, dans lequel : (A) on prépare un matériau métallique composite ayant une structure granulaire spécifique, par co-fusion des mélanges suivants : un premier mélange métallique (m1), qui est un alliage (a1), de structure cristalline cubique centrée, à base de titane, vanadium, et de chrome et/ou manganèse; ou bien un mélange de ces métaux dans les proportions dudit alliage (a1); et - un deuxième mélange (m2), qui est un alliage (a2), comprenant 38 à 42% de zirconium, niobium, molybdène, hafnium, tantale et/ou tungstène, et 56 à 60% en mole de nickel et/ou cuivre ; ou bien un mélange de ces métaux dans les proportions dudit alliage (a2), avec un rapport massique (m2)/(m1+m2) allant de 0,1% à 20% en masse ; et (B) on hydrogène le matériau métallique composite ainsi obtenu, ce par quoi on fragmente ledit matériau composite (décrépitation par l'hydrogène).

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