Hydrogen-occluding alloy and method for production thereof
First Claim
1. A hydrogen storage alloy principally of a body-centered cubic crystal structure, and represented by the compositional formula CraTibVcFedMeXf, wherein M stands for one or more elements selected from the group consisting of Al, Mo, and W;
- X stands for one or more elements selected from the group consisting of La, Mm (misch metal), Ca, and Mg;
a, b, c, d, e, and f each denotes a value in atomic percent, and 30≦
a≦
70, 20≦
b≦
50, 5≦
c≦
20, 0<
d≦
10, 0≦
e≦
10, and 0≦
f≦
10, provided that a+b+c+d+e+f=100, wherein said alloy comprises 0.005 to 0.150 wt % of O2, and has hydrogen absorption-desorption capability of not less than 2.2% of its weight in a temperature range from 0 to 100°
C. and in a pressure range from 0.001 to 10 MPa.
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Abstract
A hydrogen storage alloy and its production method are disclosed, which has an extremely high effective hydrogen storage capacity in the pressure range from 0.001 to 10 MPa, and a variety of use. The alloy is principally of a body-centered cubic crystal structure, and represented by the compositional formula CraTibVcFedMeXf (M: Al etc.; X: La etc.; 30≦a≦70, 20≦b≦50, 5≦c≦20, 0≦d≦10, 0≦e≦10, and 0≦f≦10, a+b+c+d+e+f=100). The alloy contains 0.005 to 0.150 wt % of O2, and has hydrogen absorption-desorption capability of not less than 2.2% of its weight from 0 to 100° C. and from 0.001 to 10 MPa. The method includes step (a) of melting starting materials for the alloy, deoxidizing step (b) such as step (b1) of blowing Ar into the alloy melt, and casting step (c).
10 Citations
8 Claims
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1. A hydrogen storage alloy principally of a body-centered cubic crystal structure, and represented by the compositional formula CraTibVcFedMeXf, wherein M stands for one or more elements selected from the group consisting of Al, Mo, and W;
- X stands for one or more elements selected from the group consisting of La, Mm (misch metal), Ca, and Mg;
a, b, c, d, e, and f each denotes a value in atomic percent, and 30≦
a≦
70, 20≦
b≦
50, 5≦
c≦
20, 0<
d≦
10, 0≦
e≦
10, and 0≦
f≦
10, provided that a+b+c+d+e+f=100,wherein said alloy comprises 0.005 to 0.150 wt % of O2, and has hydrogen absorption-desorption capability of not less than 2.2% of its weight in a temperature range from 0 to 100°
C. and in a pressure range from 0.001 to 10 MPa. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- X stands for one or more elements selected from the group consisting of La, Mm (misch metal), Ca, and Mg;
Specification