Ti-Fe-RE-Mn-Zr-Zn-Sb-based hydrogen storage alloy easy to activate and preparation method thereof

Abstract

The invention relates to the technical field of hydrogen storage alloys, in particular to an easy-to-activate Ti-Fe-RE-Mn-Zr-Zn-Sb-based hydrogen storage alloy and a preparation method thereof.The chemical formula of the alloy is Ti < 1.1 > Fe < 0.8 > Sm < 0.04-x > Nd < x > Mn < 0.35-y-z-m > ZryZnzSbm, x, y, z and m are atomic ratios, x is larger than or equal to 0.01 and smaller than or equal to 0.04, y is larger than or equal to 0.05 and smaller than or equal to 0.15, z is larger than or equal to 0.02 and smaller than or equal to 0.08, and m is larger than or equal to 0.01 and smaller than or equal to 0.05. According to the preparation method, an alloy ingot is obtained through induction heating and smelting in an argon atmosphere, the alloy ingot is mechanically crushed and then subjected to short-time mechanical ball milling, and alloy powder of a nanocrystalline structure is obtained. By adding a small amount of rare earth Sm and Nd and metals Mn, Zr, Zn and Sb, the hydrogen storage activation performance of the alloy is remarkably improved, and the rare earth elements easily form SmH3 and NdH3 when absorbing hydrogen for the first time to provide a catalytic activity center for activation of the alloy. Mn and Zr form an intermetallic compound ZrMn2, Zn and Sb form a SbZn phase, and the activation performance of the alloy is obviously improved on the premise that the hydrogen storage capacity is not obviously reduced. The grain size can be obviously reduced through short-time ball milling, the surface state of alloy particles is improved, the crystal defect density is greatly increased, and the alloy has very excellent activation performance.

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