HYDROGEN ABSORBING ALLOY AND PROCESS FOR PREPARING THE SAME

Title:

HYDROGEN ABSORBING ALLOY AND PROCESS FOR PREPARING THE SAME

Document Type and Number:

WIPO Patent Application WO/1998/014627

Kind Code:

A1

Abstract:

A hydrogen absorbing alloy, particularly a hydrogen absorbing alloy which enables the regulation of a fine structure formed by spinodal decomposition in order to improve the flatness of a release equilibrium pressure in practical temperature and pressure ranges and is excellent in activation and in both absorption and release capacities, and a process for preparing the same. The alloy has a composition which is represented by the general formula: Ti�x?Cr�y?V�z? (wherein x, y and z are expressed in atomic % and x + y + z = 100) and falls within such a range that a body-centered cubic lattice phase appears excluding a C14 (a kind of representative structure of the Laves phases, an MgZn�2? crystal structure) single layer region and the spinodal decomposition occurs. The alloy also has a regular periodic structure formed by the spinodal decomposition and an apparent lattice constant of 0.2950 to 0.3060 nm. The process for preparing the alloy comprises conducting solution treatment at 700 to 1500 �C for one min to 100 hr and then cooling treatment and/or aging treatment at 350 to 1200 �C for one min to 200 hr.

Inventors:

IBA HIDEKI (JP)
AKIBA ETSUO (JP)

Application Number:

PCT/JP1997/003552

Publication Date:

April 09, 1998

Filing Date:

October 03, 1997

Export Citation:

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Assignee:

TOYOTA MOTOR CO LTD (JP)
JP AGENCY (JP)
IBA HIDEKI (JP)
AKIBA ETSUO (JP)

International Classes:

C22F1/00; C01B3/00; C22C1/00; C22C14/00; C22C27/02; C22C27/06; C22C30/00; C22F1/11; C22F1/18; (IPC1-7): C22C30/00; C22C14/00; C22C27/02; C22C27/06; C22F1/11; C22F1/18

Foreign References:

JPS58217654A	1983-12-17
JPS61250135A	1986-11-07
JPH04337045A	1992-11-25

Other References: