PURPOSE: To obtain a new metallic alloy for hydrogen occlusion of Zr type free from reduction in the amount of hydrogen occlusion caused by alloy poisoning by water, O, etc., and very useful as material for hydrogen occlusion and release, by providing a composition containing each prescribed percentage of Ti and/or Nb, Co and/or Fe, Mn and Cr.
CONSTITUTION: The metallic alloy for hydrogen storage of Zr type is represented by a prescribed rational formula with atomic composition. The above alloy is, for example, Zr0.95 Nb0.05 (Mn0.8 Cr0.1 Fe0.1)2. The above illustrated alloy has a hydrogen occlusion quantity of 1.5wt% and hydrogen occlusion and releasing pressures of about 0.6atm and about 0.2atm, respectively, and is minimized in hysteresis. Moreover, the alloy of this invention causes practically minimized material deterioration even if subjected to a repetition of occlusion and release of hydrogen containing impurities such as water, oxygen, carbon dioxide, etc. Further, this alloy is easily activated and has excellent hydrogen occluding and releasing velocities practically equal to or higher than those of conventional materials.
EBATO KAZUO
TAMURA KEIJI
YOSHIDA HIROSHI