ガス噴霧したＴｉ‐Ｖ‐Ｃｒ系水素吸蔵合金の水素吸蔵特性

概要

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Recently, hydrogen absorbing alloys are of great need in applications to nickel-metal hydride secondary batteries and the polymer electrolyte fuel cells etc. In particular, Ti-V-Cr hydrogen absorbing alloy has large capacity for hydrogen storage. To increase hydrogen absorbing capacity, the authors investigated the properties of rapidly quenched powder made by gas atomization. It was discovered that the layer of high oxygen content existed on the surface of the gas atomization powder from the result measured by Auger electron spectroscopy. The small hydrogen absorbing capacity in the P-C-T curve was due to the high concentration of oxygen in the alloy. It was thought that the CaO crucible for melting the alloy caused high oxygen concentration. We also studied the relationship between the hydrogen absorbing properties and the oxygen concentration of the alloy by arc melting. As a result, the existence of oxygen had bad influences on hydrogen absorbing capacity, plateau slope and adjustment of plateau pressure.
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