To provide a hydrogen-occluding-metal-nanoparticle-dispersed hydrogen storage alloy having fine structure and capable of occluding hydrogen more effectively and also to provide its manufacturing method.
The hydrogen storage alloy can be obtained by applying heat treatment to an amorphous alloy having a composition in atomic percentages represented by the compositional formula: Zr100-a-bPdaMb (wherein, 15≤a≤40 and 0≤b≤10 are satisfied; and M is at least one element among Pt, Au, Fe, Co and Ni) in the air or in an oxygen atmosphere and has a structure in which Pd or Pd compound or both of them are dispersed in the form of superfine particles in a ZrO2 matrix. The alloy has an amount of hydrogen occlusion of ≥2.5 wt.% based on Pd weight. The alloy is suitable for use as a hydrogen occlusion/transportation medium. The alloy can be manufactured by rapidly solidifying a melt of master alloy prepared by melting at ≥104 K/s cooling rate, applying oxidizing heat treatment to the resultant rapidly solidified amorphous alloy at 250-350°C in the air or in an oxygen atmosphere to selectively oxidize Zr as an alloying element, and dispersing Pd as a hydrogen-occluding metal or Pd compound in the form of superfine particles of nanoparticle size in ZrO2.
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KIMURA HISAMICHI
ARATA YOSHIAKI
ARATA YOSHIAKI
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