Yttrium-zirconium-iron-aluminum alloy material, preparation method and application

Abstract

The invention relates to the field of hydrogen storage alloy materials, in particular to an yttrium-zirconium-iron-aluminum alloy material. The chemical general formula of which is Y < 1-x > Zr < x > Fe < 2-y > Al < y >, wherein, 0.25 < x < 0.45, and 0.1 < Y < 0.4. The invention further discloses a preparation method of the yttrium-zirconium-iron-aluminum alloy material. The preparation method comprises the following steps of weighing metal block materials of yttrium, zirconium, iron and aluminum according to the mass ratio of the chemical general formula, mixing, smelting at the temperature of higher than 1600 DEG C, and cooling to obtain an alloy ingot; and placing the obtained alloy cast ingot in an annealing container to be subjected to annealing treatment, and after cooling, crushing the alloy cast ingot into a powder state to obtain the yttrium-zirconium-iron-aluminum alloy material. According to the alloy material, iron and yttrium are partially replaced with the aluminum element with the large atomic radius and the zirconium element with the small atomic radius correspondingly, the prepared yttrium-zirconium-iron-aluminum alloy is of a zirconium-rich phase and yttrium-rich phase double-phase structure, the alloy achieves reversible hydrogen absorption and desorption of the yttrium-rich phase at the room temperature, and the hydrogen storage capacity is obviously improved compared with that of a single yttrium-rich phase.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage alloy materials, in particular to a yttrium-zirconium-iron-aluminum alloy material, a preparation method and an application. Background technique [0002] With the advancement of science and technology and the development of society, countries and regions around the world have adopted clean and renewable primary energy to replace traditional fossil energy such as petroleum and coal in order to solve the harm caused by carbon emissions and polluting gases to the atmospheric environment and human health. . As a clean and efficient secondary energy source, hydrogen energy is an ideal carrier of primary energy, and hydrogen has a wide range of sources. Hydrogen itself is non-toxic, its combustion calorific value is three times that of gasoline, and its combustion product is water. Therefore, hydrogen energy is expected to become An important part of the sustainable energy system of the futur...

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Problems solved by technology

However, the hydride formed by the hydrogen absorption of this kind of rare earth hydrogen storage alloy has high thermal stability, which leads to the hydrogen desorption platform pressure of this kind of hydride is much lower than the atmospheric pressure, and its dehydrogenation temperature is generally higher than 150 ° C. It is difficult to completely remove the hydrogen in the

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