Abstract: The invention relates to a method for producing a molded body made of sintered steel, with a sintering powder on the basis of iron being mixed with a master alloy powder containing nickel, boron and iron, and with the powder mixture being pressed into a formed body before the formed body is sintered under the conditions of a liquid-phase sintering with a volume share of liquid phase up to 15%. In order to improve the impact strength, it is proposed that the boron content of the powder mixture is between 0.03% and 0.2% by weight at a boron share of the master alloy powder of less than 10% by weight, that the weight ratio between the nickel and the boron share of the powder mixture exceeds 5 and that the master alloy powder has an average particle size of between 10 and 90 ?m.

Abstract: An electrochemically active material consisting of a CaCu5 structure single-phase hydridable alloy with the formula MmNiaMnbAlcCodCre in which Mm is a mischmetal containing at least 50 wt % La, where: 5.10≦(a+b+c+d+e), d≦0.55, and 0.03≦e≦0.1.

Abstract: An electrochemically active material consisting of a CaCu5 structure single-phase hydridable alloy with the formula MmNiaMKnbAlcCodCre in which Mm is a mischmetal containing at least 50 wt % La, where: 5.10≦(a+b+c+d+e), d≦0.55, and 0.03≦e≦0.1.

Abstract: The invention relates to a process for recovering metals from used nickel/hydride storage batteries, in which storage battery scrap has been mechanically comminuted and divided into at least a coarse fraction and a fine fraction capable of being treated separately from one another. The process comprises the steps of digesting and dissolving the fine fraction with a mixture of sulfuric acid and hydrogen peroxide, performing a double sulfate precipitation of the rare earths by raising the pH, performing a precipitation of the iron and of the aluminum by further raising the pH, performing a solvent extraction of other metals to separate nickel and cobalt which remain in the aqueous phase from the other metals which are extracted into the organic phase. Optionally, the nickel and the cobalt can be separated from each other and, if desired, the mixed-metal rare earth component which has been recovered can be melted together with cobalt and nickel alloy for the fabrication of new batteries.

Abstract: In the recycling of used nickel/metal hydride storage batteries, the battery scrap is dissolved in sulphuric acid after mechanical separation of the coarse constituents by magnetic and air separation. A solvent extraction is performed with the digestion solution, from which the rare earths (from the hydrogen-storage alloys in the negative electrodes) and iron and aluminum have been selected by precipitation, under conditions pH, choice of solvent, volumetric ratio of the phases) which are such that the aqueous phase contains nickel and cobalt in the same atomic ratio as that in which they were present in the scrap. This makes possible a joint recovery by simultaneous electrolysis, in which process the deposition product forms a master alloy which can be used, together with the precipitated rare earths which have been electrometallurgically reprocessed as misch metal, for the production of fresh hydrogen-storage alloys.

Abstract: As an active material for its negative electrode, a hydrogen storage alloy for a Ni/H battery has the compositionMmNi.sub.v Al.sub.w Mn.sub.x Co.sub.y M.sub.z,where Mm is a misch metal, M is Fe, Cu, or a mixture of Fe and Cu, and where0.1.ltoreq.z.ltoreq.0.4,0.2.ltoreq.y.ltoreq.0.4,0.3.ltoreq.w.ltoreq.0.5,0.2.ltoreq.x.ltoreq.0.4, and4.9.ltoreq.v+w+x+y+z.ltoreq.5.1.The partial substitution of Co by M, in conjunction with a special production method including the steps of atomizing the molten alloy, followed by heat-treatment and pulverization, leads to an alloy having a particularly high cycle lifetime and discharge capability.