Abstract: The tank is of the type including a container (4) for housing hydrogen, and metallic hydride placed inside the container. According to one aspect of the invention, it includes at least one solid body (6) formed of a compacted material including metallic hydride and a matrix. Application in particular for tanks for internal combustion engines or for fuel cells, in particular for motor vehicles, as well as for any stationary or mobile application using hydrogen.

Abstract: The invention relates to a Fe—Si—La alloy having the atomic composition: (La1-a-a?MmaTRa?)1[(Fe1-b-b?CObMb?)1-x(Si1-cXc)x]13(CdNeH1-d-e)y(R)z(I)f Mm representing a mixture of lanthanum, cerium, neodymium and praseodynium in the weight proportion of 22 to 26% La, 48 to 53% Ce, 17 to 20% Nd and 5 to 7% Pr, the said mixture possibly comprising up to 1% by weight of impurities, TR representing one or more elements of the rare earth family other than lanthanum, M representing one or more type d transition elements of the 3d, 4d and 5d layers X representing a metalloid element selected from Ge, Al, B, Ga and In R representing one or more elements selected from Al, Ca, Mg, K and Na, I representing one or two elements selected from O and S, with: 0?a<0.5 and 0?a?<0.2 0?b?0.2 and 0?b?<0.4 0?c?0.5 and 0?d?1 0?e?1 and f?0.1 0.09?x?0.13 and 0.002?y?4 0.0001?z?0.01 the subscripts b, d, e, x and y being such that the alloy further satisfies the following condition: 6.143b(13(1?x))+4.437y[1?0.

Abstract: The invention relates to a safe hydrogen-storing tank that is easy to manufacture and enables the quick kinetic absorption of hydrogen, which reduces the variations in volume and has a low cost in terms of material and energy. The invention has the aim of providing a tank for storing hydrogen, including a hydrogen inlet (21) and a hydrogen outlet (22) in fluid communication with at least one solid body (10-11) capable of the exothermal absorption and endothermal desorption of hydrogen, wherein said at least one solid body (10-11) is made of a compacted material containing light metal hydride and a heat-conducting matrix, and wherein said at least one solid body (10-11) is in heat-transfer relation with at least one heat recovery material (42) free from salt or molten-salt compounds and capable of absorbing the heat generated by the hydrogen absorption and of releasing said absorbed heat so as to provide heat for hydrogen desorption.

Abstract: 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-centered cubic crystal structure, based on titanium, vanadium, chromium and/or manganese, or a mixture of these metals in the proportions of the 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 the 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 the composite material is fragmented (hydrogen decrepitation).

Abstract: A material for storing hydrogen is prepared by a method including an extreme plastic deformation operation selected from cold-rolling, quick-forging and extrusion-bending performed on a metallic material selected from among a metal and an alloy containing said metal, or on a compound containing a metal material selected from among a metal and an alloy containing said metal and to which a hydride of said metal or a hydride of said alloy has been added. When the extreme plastic deformation operation is carried out on the metallic material, it is followed by an operation of adding, to the metal material, a hydride of said metal or a hydride of said alloy, as well as by a dispersing operation.

Abstract: 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 the 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 the 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 the composite material is fragmented (hydrogen decrepitation).

Abstract: 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-centered cubic crystal structure, based on titanium, vanadium, chromium and/or manganese, or a mixture of these metals in the proportions of the 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 the 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 the composite material is fragmented (hydrogen decrepitation).

Abstract: The invention relates to a safe hydrogen-storing tank that is easy to manufacture and enables the quick kinetic absorption of hydrogen, which reduces the variations in volume and has a low cost in terms of material and energy. The invention has the aim of providing a tank for storing hydrogen, including a hydrogen inlet (21) and a hydrogen outlet (22) in fluid communication with at least one solid body (10-11) capable of the exothermal absorption and endothermal desorption of hydrogen, wherein said at least one solid body (10-11) is made of a compacted material containing light metal hydride and a heat-conducting matrix, and wherein said at least one solid body (10-11) is in heat-transfer relation with at least one heat recovery material (42) free from salt or molten-salt compounds and capable of absorbing the heat generated by the hydrogen absorption and of releasing said absorbed heat so as to provide heat for hydrogen desorption.

Abstract: The invention relates to a method for preparation of a material adapted to reversible storage of hydrogen, including steps consisting of providing a first powder of a magnesium-based material, hydrogenating the first powder to convert at least part of the first powder into metal hydrides, mixing the first hydrogenating powder with a second powder additive, the proportion by mass of the second powder in the mix obtained being between 1% and 20% by mass, wherein the additive is formed from an alloy with a centred cubic structure based on titatnium, vanadium and at least one other metal chosen from chromium or manganese, and grinding the mix of first and second powders.

Abstract: The invention relates to a Fe—Si—La alloy having the following atomic composition: (La1-a-a?MmaTRa?)1[(Fe1-b-b,CobMb,)1-x(Si1-cXc)x]13(CdNeH1-d-e)y(R)r(I)r, in which Mm is a mixture of lanthanum, cerium, neodymium and praseodymium in a weight proportion of 22 to 26% of La, 48 to 53% of Ce, 17 to 20% of Nd and 5 to 7% of Pr, wherein said mixture may include up to 1 wt % of impurities, TR is one or more elements of the rare earth family other than lanthanum, M is one or more d-type transition element from layers 3d, 4d and 5d, X is a metalloid element selected from Ge, Al, B, Ga and In, R is one or more element selected from Al, Ca, Mg, K and Na, I is one or two elements selected from O and S, with: 0?a<0.5 and 0?a?<0.2; 0?b?0.2 and 0?b?<0.4; 0?c?0.5 and 0?d?1; 0?e?1 and f?0.1; 0.09?x?0.13 and 0.002?y?4; 0.0001?z?0.01; the indicia b, d, e, x and y being such that the alloy further meets the following condition: 6.143b(13(1?x))+4.437y[1?0.0614(d++e)]?1 Eq.1 d*y?0.005 Eq.2.

Abstract: The invention relates to a tank of the type that comprises a container (4) for housing hydrogen and metallic hydride placed inside the container. According to one part of the invention, the tank includes at least one solid body (6) made from a compacted material containing metallic hydride and a matrix. The invention is suitable, for example, for tanks for internal combustion engines or for fuel cells, in particular for motor vehicles, as well as for any stationary or mobile application involving hydrogen.

Abstract: The invention relates to a method of manufacturing (100) a multilayer structure on a support, the said structure comprising n elemental active layers of material, n being an integer greater than or equal to two, the method comprising at least the following steps: a step of depositing (200) a first elemental active layer of material, a step of depositing (300) an nth elemental active layer of material, characterized in that the method includes a single step of implanting ionic species (600) on the n elemental active layers of material deposited, through a resist, which is appropriate for modifying respective properties of each of the n elemental active layers in order to obtain a multilayer structure having controlled properties.

Abstract: A compacted material includes magnesium hydride and expanded natural graphite and a method for preparing such a material including the steps which consist in: (i) mixing a magnesium hydride or powdered magnesium with a powdered graphite; and (ii) shaping the mixture by compaction. It also proposes the use of the material for hydrogen storage and a method for hydrogen storage and release from storage including the steps which consist in: (a) introducing the material into a suitable hydrogen tank; (b) placing the material under hydrogen pressure in pressure and temperature conditions that enable the hydrogen to be absorbed by the material; and (c) desorbing the hydrogen from the material in pressure and temperature conditions permitting the desorption of the material.

Abstract: 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 the 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 the 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 the composite material is fragmented (hydrogen decrepitation).

Abstract: The invention relates to a method for preparation of a material adapted to reversible storage of hydrogen, including steps consisting of providing a first powder of a magnesium-based material, hydrogenating the first powder to convert at least part of the first powder into metal hydrides, mixing the first hydrogenating powder with a second powder additive, the proportion by mass of the second powder in the mix obtained being between 1% and 20% by mass, wherein the additive is formed from an alloy with a centred cubic structure based on titatnium, vanadium and at least one other metal chosen from chromium or manganese, and grinding the mix of first and second powders.

Abstract: The invention concerns a method for preparing a magnetic material by forging, characterised in that, in a first embodiment, it comprises the following steps; placing in a sheath an alloy based on at least one rare earth, at least one transition metal and at least one other element selected among boron and carbon; bringing the whole alloy to a temperature not less than 500° C.; forging the whole at a deformation speed of the material not less than 8 s−1. After forging, it is possible to subject the resulting product to at least one annealing and hydridation then dehydridation, in another embodiment, it consists in starting with an alloy based on at least one rare earth and one transition metal and proceeding as in the first embodiment. After forging and, optionally, annealing, hydridation and dehydridation treatments, the resulting material is subjected to nitriding.

Abstract: There is disclosed a process for optimizing the magnetic properties of a multiphase product of composition rare earth/iron/boron endowed with permanent magnet properties at ambient temperature. This composition serves as a precursor, which is first subjected to a decrepitation treatment by hydrogenation under low pressure at low temperature to obtain an intermediate hydride in pulverulent form. The pulverulent intermediate hydride is subsequently subjected to a first heat treatment under vacuum for partial dehydrogenation at a temperature below its element separation temperature. The non-separated product thereby obtained is subjected to a second heat post-treatment under an initial primary vacuum and extensively dehydrogenated until the primary vacuum is reestablished at a temperature close to 600.degree. C. The precursor can be an isotropic material obtained by fast quenching, such as wheel quenching or hot welding with a forging ratio of at least 10.

Abstract: New magnetic hydride Nd.sub.2 Fe.sub.14 BH.sub.x (0<x<5) and family corresponding to other rare earths and yttrium. Possible substitution of Fe by Co. Preparation from Nd.sub.2 Fe.sub.14 B by hydrogenation (ambient temperature; pH.sub.2 >20 bar), which can be reversed to give powdered Nd.sub.2 Fe.sub.14 B. Remarkable magnetic properties.