Hydrogen absorbing alloy and process for preparing same

Details Hydrogen absorbing alloy and process for preparing same Hydrogen absorbing alloy and process for preparing same

1993-10-05

1996-03-05

Simmons, David A.

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148501, 148503, 148505, 148675, 420900, C22F 110

Patent

active

054964245

ABSTRACT:
A hydrogen absorbing alloy represented by the general formula R.sub.1-x A.sub.x (Ni.sub.5-y B.sub.y).sub.z wherein R is Mm (misch metal) or La, A is at least one element selected from the group consisting of Ce, Nd, Pr, Sm and Y, B is at least one element selected from the group consisting of Al, Sn, V, Cr, Mn, Fe, Co and Cu, 0.ltoreq.x.ltoreq.0.5, 0<y.ltoreq.1.0 and 0.8.ltoreq.z.ltoreq.1.2. The alloy is prepared by subjecting an alloy material of the above composition to a heat treatment so that when the plateau region of the resulting hydrogen absorbing alloy is expressed by a normal cumulative distribution function wherein the hydrogen content of the alloy is taken as frequency and the logarithm of the equilibrium hydrogen pressure of the alloy as a random variable, the alloy is at least 0.04 to up to 0.10 in standard deviation .sigma..

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J. Japan Inst. Metals, vol. 56, No. 8, (1992), pp. 965-972.
Derwent Abstract of JP 5-222474 (Aug. 31 1993).
Patent Abstract of Japan, vol. 016, No. 244 (C-0947) (Jun. 4, 1992) of JP 4-052242 (Feb. 20, 1992).
Yonezu et al., Denki Kagaku, vol. 58, No. 8, pp. 742-747 (1990) (Abstract).

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