| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a hydrogen storage alloy suitable for use in the storage, transportation, or the like, of hydrogen, having high hydrogen occluding capacity and long-term repeated hydrogen absorbing/releasing life, usable at temperatures in the vicinity of room temperature, excellent in oxidation resistance, and easy of handling in the air. SOLUTION: This hydrogen storage alloy has a composition represented by TiaCrbMocNbdAeBf (where A is one or >=2 elements selected from Mn, Fe, Co, Cu, V, Zn, Zr, Ag, Hf, Ta, W, Al, Si, C, N, P, and B; B is one or >=2 rare earth elements; a+b+c+d+e+f=1, 0.2<=a<=0.7, 0.1<=b<=0.7, 0.01<=c+d<=0.4, 0.01<=e<=0.3, and 0.001<=f<=0.03 are satisfied; and it is preferable that A contains 0.01-0.15% Fe and/or 0.001-0.012% C) and also has a structure composed essentially of body-centered cubic crystal having <=100μm average crystalline grain size. This hydrogen storage alloy is manufactured by means of rapid solidification or solution heat treatment. Oxidation resistance can be remarkably improved by applying Ni coating to the surface of the hydrogen storage alloy and then carrying out heat treatment at 400-1000 deg.C or by applying Ni coating to the surface of the hydrogen storage alloy by means of mechanical alloying to form a Ti-Ni compound, particularly an Ni-added layer composed essentially of TiNi, at the surface.
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