HYDROGEN STORAGE ALLOY EXCELLENT IN PLATEAU FLATNESS

摘要

PROBLEM TO BE SOLVED: To provide a hydrogen storage alloy improved in plateau flatness, widen in using environments and furthermore excellent in occluding and releasing characteristics, as to a hydrogen storage alloy excellent in plateau flatness, particularly the one in which a fourth element is added to a Ti-Cr-V series, by forming its metallic structure of the one of the BCC single phase or converting it into the one of BCC single phase by heat treatment. ;SOLUTION: In an alloy expressed by the general formula of Ti_a Cr_b V_c A_d with the ratios of numbers of atoms as (a), (b), (c) and (d), where a+b+c+d=100, (A) denotes one or ≥ two kinds among the group IIIb, Mn, Co, Ni, Zr, Nb, Hf, Ta and Al, and, also, compositional regions of 14≤a≤60, 14≤b≤60, 9≤c≤60 and 0d8 or 9≤c≤25 are regulated and having a structure of BCC(body-centered cubic) + C14 (Laves phase), it is heated at 1000 to 1400°C and is rapidly cooled to convert its structure into the one of the BCC single phase.;COPYRIGHT: (C)1999,JPO