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A kind of ce-mg-ni low pressure hydrogen storage alloy material and preparation method thereof

A hydrogen storage alloy and alloy material technology, applied in the field of Ce-Mg-Ni low-pressure hydrogen storage alloy material and its preparation, can solve the problems of poor control of alloy composition, genetic alloy hydrogen storage function, and poor kinetic performance , to achieve good hydrogen absorption kinetics, complete crystal structure, and easy-to-control steps

Active Publication Date: 2020-11-06
北京恒鑫精诚科技有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many studies on stable Ce-Mg-Ni ternary alloys, and the use as hydrogen storage materials is not clear. Here, the thermodynamic conditions for the reaction of Ce and H in contact are excellent, but the kinetic properties are poor at high temperatures. This may be due to CeH at high temperature 2.73 The rapid accumulation of compounds on the surface is not conducive to the further diffusion of H. Under low temperature conditions, less H reserves will migrate inside Ce, forming a good H adsorption and desorption circuit at low temperature and low pressure.
In addition, there are certain difficulties in the rare earth-Mg alloy smelting process, mainly due to the volatilization of Ce and Mg. Without a proper and reasonable process, the alloy composition cannot be well controlled, and this defect will also be inherited to subsequent alloy storage. Hydrogen functional, especially superlattice structure

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  • A kind of ce-mg-ni low pressure hydrogen storage alloy material and preparation method thereof
  • A kind of ce-mg-ni low pressure hydrogen storage alloy material and preparation method thereof
  • A kind of ce-mg-ni low pressure hydrogen storage alloy material and preparation method thereof

Examples

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Embodiment 1

[0041] Example 1 A Ce-Mg-Ni low pressure hydrogen storage alloy material and its preparation method

[0042] This embodiment is a Ce-Mg-Ni low-pressure hydrogen storage alloy material, and the preparation method is carried out in sequence according to the following steps:

[0043] (11) Take bulk metal magnesium, rare earth metal cerium, and metal nickel with a purity of ≥99.8%, weigh them according to the stoichiometric ratio Ce:Mg:Ni of 23:4:7, and place them in an intermediate frequency induction furnace. Vacuum down to 1×10 -2 Pa-5×10 -3 Pa, filled with high-purity helium to 0.04MPa, induction melting at 1500°C for 0.2h, and pouring under the protection of high-purity helium to obtain the alloy;

[0044] (2) Place the smelted alloy in a vacuum heat treatment device after temperature calibration, and after more than five times of gas washing, vacuumize and feed high-purity helium to 0.2MPa, and heat treat the alloy according to the following heat treatment process to obtai...

Embodiment 2-5

[0051] Example 2-5 Ce-Mg-Ni low-pressure hydrogen storage alloy material and its preparation method

[0052] Examples 2-5 are a Ce-Mg-Ni low-pressure hydrogen storage alloy material, and the preparation method is similar to that of Example 1, except that the corresponding technical parameters in the preparation process are different. See the table below for details.

[0053]

Embodiment 6

[0054] Example 6 Effects of Different Preparation Methods on the Properties of Ce-Mg-Ni Low Pressure Hydrogen Storage Alloy Materials

[0055] In order to explore the influence of different preparation methods on the structure and properties of the final alloy, the following experiments were carried out in this example, and to prepare single-phase Ce 23 Mg 4 Ni 7 alloy as an example to carry out experiments.

[0056] Group A: the alloy prepared by the preparation method of this embodiment 1;

[0057] Group B: The chemical composition of the alloy is the same as in Example 1, the difference is that the preparation method adopts the method of powder sintering, and the selected precursors are Ce and CeMg 3 and Ce 2 Ni 7 Alloy, carry out proportioning according to the alloy composition in embodiment 1, and concrete preparation process is as follows:

[0058] Weigh Ce block and Mg block with a purity greater than 99% according to the atomic molar mass ratio of 1:3, and use a ...

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Abstract

The invention discloses a Ce-Mg-Ni low-pressure hydrogen storage alloy material and a preparation method thereof. The alloy material is a Ce23Mg4Ni7 single-phase alloy and has a long-range ordered superlattice structure, and the phase abundance of the alloy material is greater than 90%. The alloy is prepared by induction melting and then heat treatment. The method is easy to control in steps and short in period, and has good hydrogen absorption and desorption dynamics performance at low temperature and low pressure. The alloy can absorb hydrogen at normal temperature and 0.05 bar. After the alloy is made into a fuel cell negative electrode material, the alloy has excellent performance such as low hydrogen absorption temperature, low hydrogenation pressure and high safety performance.

Description

technical field [0001] The invention belongs to the field of metal materials and their preparation, and relates to a Ce-Mg-Ni low-pressure hydrogen storage alloy material and a preparation method thereof. Background technique [0002] In recent years, various degrees of smog have appeared in large areas of the country. Most areas in northern and central China have already been upgraded to level six pollution, and the southern areas are also hard to escape. The pollution is widespread and deep, and the situation is very serious. The reason is closely related to the irrational use of fossil energy. People are constantly looking for new "energetic body energy" with abundant reserves. Hydrogen is the most widely distributed substance in the universe. Hydrogen energy has the characteristics of cleanliness and high efficiency. It is an ideal new "energy body energy". The development of hydrogen It has been highly concerned by the academic circles and governments of various countr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C28/00C22C1/02C22F1/16C22F1/02H01M4/90
CPCC22C1/02C22C28/00C22F1/02C22F1/16H01M4/9041Y02E60/50
Inventor 刘卓承李一鸣张国芳瞿伟胡锋赵鸣张捷宇
Owner 北京恒鑫精诚科技有限公司