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Rare earth-magnesium-transition metal base hydrogen storage metal and preparation method thereof

A technology of transition metals and hydrogen storage alloys, applied in the field of hydrogen storage materials, can solve the problems of slow hydrogen absorption and desorption, high hydrogen absorption and desorption temperature, and lack of magnesium content, etc., to achieve control of volatilization loss, high hydrogen storage capacity, and reduced volatilization loss effect

Inactive Publication Date: 2009-12-09
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the common problem of this type of alloy is that when the content of metal magnesium is high, the hydrogen absorption and desorption temperature of the alloy is high, generally higher than 300 ° C, and the hydrogen absorption and desorption speed is slow and the cycle life is poor; When it is lower, the hydrogen storage capacity of the alloy is lower, generally lower than 3wt.%
[0008] (1) In the alloy La2-xMxMg17, due to the high magnesium content and the lack of alloying elements or second phases with high catalytic activity, there are disadvantages such as high hydrogen absorption and desorption temperature and poor cycle life.
In addition, the preparation of alloy materials by mechanical ball milling has the difficulties of complex process and difficult industrialization
[0009] (2) The alloy RexMgyNi4-xAx contains high-priced elements such as Co and Mo, and the cost of the alloy is high
[0010] (3) Alloy Al-yByCx alloy does not contain elements with high catalytic activity, so it is difficult to absorb and release hydrogen
[0011] (4) The RE1.2-xMg3Niy alloy is a LaMg3 type alloy with a single structure. Due to the high Mg content, there are problems of high hydrogen absorption and desorption temperature and poor service life.
[0012] (5) Magnesium is very easy to volatilize and lose during alloy preparation, but none of the above-mentioned patent examples gives an effective method for effectively controlling magnesium loss during smelting and the deviation of the test composition of the actually prepared sample, and the actual composition is far from The problem of unstable alloy design composition and actual composition

Method used

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  • Rare earth-magnesium-transition metal base hydrogen storage metal and preparation method thereof

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Embodiment 1

[0027] The ingredients are formulated according to the alloy chemical composition formula LaMg2Cu1.5Ni0.5, Mg is made of LaMg3 master alloy as raw material, other elements are made of simple metal, and the purity is above 99.9%. Use a domestic 10Kg vacuum induction furnace for melting, evacuate to 10-2Pa, fill with argon to a pressure of 0.06MPa, adjust power and melting temperature to melt all raw materials, and add Mg2Ni master alloy by secondary feeding. Keep warm at about 500°C for 5 minutes. After smelting, pour the molten metal into a copper mold with cooling water, and leave the furnace after cooling to 40°C. Then the alloy ingot is annealed under the protection of an inert gas, the treatment temperature is 350° C., and the temperature is kept for 12 hours. After annealing, inductively coupled plasma emission spectroscopy (ICP) was used for elemental analysis, and the results are shown in Table 1. Carry out X-ray powder diffraction analysis (XRD) to sample, the result ...

Embodiment 2

[0029] The chemical composition formula is LaMg 2 Fe 0.5 Ni 1.5 , where Mg is MgNi 2 The master alloy is used as the raw material, the purity of other elemental raw materials is the same as in Example 1, and the melting method of the alloy is the same as in Example 1. The annealing method after the sample was taken out of the furnace was the same as in Example 1, the annealing temperature was 400° C., and the annealing time was 8 hours. The ICP analysis results of the alloy and the hydrogen absorption capacity of the test are shown in Table 1, and the X-ray diffraction patterns are shown in Table 1. Figure 4 .

Embodiment 3

[0031] The chemical composition formula is LaMgNi 1.0 Cu 1.0 , batching and smelting method are with embodiment 1. The annealing temperature is 430° C., and the annealing holding time is 5 hours. The ICP analysis results and hydrogen absorption of the alloy are shown in Table 1, and the X-ray diffraction patterns are shown in Table 1. Figure 5 .

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Abstract

The invention relates to a rare earth-magnesium-transition metal base hydrogen storage metal with high hydrogen storage capacity and moderate hydrogen storage temperature and preparation method thereof. The metal is characterized in that the chemical formula thereof is REMgxMy, wherein x is more than 1 and less than 2, y is more than 1 and less than 3; RE is one or more than one of rare earth metals of La, Ce, Pr, Nd, cerium rich mish metal Mm and lanthanum rich mish metal M1; M is one or more than one of transition metals of Cu, Ni, Mn, Fe and Zn. The rare earth-magnesium-transition metal base hydrogen storage metal provided by the invention is also characterized in that the metal at least contains a multiphase structure of CeMg3 type LaMg3 phase and LaMg2Cu2 phase. The invention also provides a preparation method of the rare earth-magnesium-transition metal base hydrogen storage metal. The preparation method mainly includes that induction melting is adopted, Mg base master alloy is utilized to substitute magnesium and used as raw material, secondary charging is used for preparing the metal, and the metal is annealed. The hydrogen storage metal of the invention has the advantages that the hydrogen storage capacity at 200 DEG C is more than 3wt% and the metal can be used as solid-state hydrogen storage material.

Description

technical field [0001] The invention relates to the field of hydrogen storage materials, and in particular provides a rare earth-magnesium-transition metal-based hydrogen storage alloy with moderate hydrogen storage temperature and large hydrogen storage capacity and a preparation method thereof. Background technique [0002] With the deterioration of the environment and the lack of energy, the development of environmentally friendly energy has become the focus of research in various countries. Currently, hydrogen is one of the most attractive forms of energy due to its high energy density and environmental friendliness. However, how to realize the safe and efficient storage and transportation of hydrogen is one of the keys to solving the practical application of hydrogen energy. To this end, various types of hydrogen storage materials have been researched and developed. Metal and alloy hydride systems have been rapidly developed as excellent storage and transport material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C30/02C22C30/04C22C28/00C22C1/03C21D1/26C21D1/74C22F1/00
Inventor 韩树民扈琳李媛杨诚
Owner YANSHAN UNIV
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