| 摘要 |
PROBLEM TO BE SOLVED: To produce a high-capacity hydrogen storage alloy having body- centered cubic structure at a low cost by mixing a V2 O5 powder, an Ni powder, necessary elements, and metallic Ca grains under specific conditions, compacting the resulting mixture, and then heating and reducing the resultant green compact in an inert gas atmosphere to remove Ca. SOLUTION: First respectively prescribed amounts of V2 O5 powder, Ni powder (<=1μm average grain size), and raw materials (metallic Cr, TiO2 , La2 O3 ) containing elements necessary for alloy in the form of metal or oxide are mixed with metallic Ca grains in the amount 1.2 to 1.8 times the reduction equivalent of the oxides in these raw materials. Then, a green compact, prepared by compacting the resultant mixture, is heated in an argon gas atmosphere at about 950-1,050 deg.C, by which the oxides are reduced by the melting of metallic Ca and also a mass of Ca-containing alloy is formed. This alloy mass is cleaned with an aqueous solution of NH4 Cl to remove remaining Ca. By this method, the hydrogen storage alloy, excellent in cycle characteristic, containing at least Ti, V, and Ni, and having body-centered cubic structure, can be obtained. |
