Ferro-magnetic Fe-Dy hydrogen storage material and preparation method thereof

Abstract

The invention discloses a ferro-magnetic Fe-Dy hydrogen storage material. The Fe-Dy hydrogen storage material with the chemical formula being Fe17Dy2 is prepared from Fe and rare earth Dy serving as raw materials through electric arc melting and heat treatment, the ferro-magnetic material has a Th2Ni17 type hexagonal crystal structure, the saturated magnetization intensity is 62 to 100 Am<2> / kg, the Curie temperature is 90 to 100 DEG C, and the hydrogen storage performance is 0.1 to 0.2 percent by weight. The preparation method comprises eh following steps: 1) weighting Fe and Dy according tothe chemical formula and smelting to prepare Fe17Dy2 alloy; and 2) performing heat treatment on the prepared alloy to prepare the Fe-Dy hydrogen storage material. When serving as a hydrogen storage material, the ferro-magnetic Fe-Dy hydrogen storage material has magnetic phase transition characteristic, the hydrogen storage quantity is 0.11 to 0.14 percent by weight when the temperature is higherthan the Curie temperature, and the hydrogen storage quantity at the Curie temperature is increased to 0.18 to 0.2 percent by weight. The Curie temperature of the hydrogen storage material is low, andthe work temperature is near the Curie temperature.

Description

technical field [0001] The invention belongs to the field of new materials and relates to new energy materials, in particular to a ferromagnetic Fe-Dy hydrogen storage material and a preparation method thereof. Background technique [0002] R-T compounds formed by the combination of rare earth elements (R) and transition metals (T) include T 2 R, T 3 R, T 17 R 2 , T 23 R 6 etc. This type of compound has been extensively studied due to the excellent magnetostrictive, magnetoresistance, and magnetocaloric properties due to the interaction of 3d-4f electron shells. However, in the past, people only paid attention to its magnetic properties, and there were few studies on other properties. Nowadays, with the development of society and the advancement of technology, the requirements for materials are not limited to one aspect. In order to fully exert the performance of various aspects of the material and maximize the utilization rate, it is necessary to explore its performan...

AI Technical Summary

Problems solved by technology

[0004] Prior Art Discovery T 23 R 6 Type compounds have hydrogen storage properties and the magnetic properties have changed accordingly after hydrogen storage, but no effect of Curie temperature on hydrogen storage properties has been found.

At the same time, T 23 R 6 Type compounds have a technical problem of high Curie temperature

Although this problem can be reduced by adding a third element, such as Mn, to lower its Curie temperature, a new technical problem arises that Mn is volatile during the smelting process, making it difficult to control the composition and making single-phase compounds difficult to obtain.

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