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la-mg-ni hydrogen storage alloy and preparation method thereof

A hydrogen storage alloy and alloy technology, which is applied in the field of hydrogen storage materials, can solve the problems such as difficulty in obtaining the mold phase, and achieve the effects of easy control, fast phase transformation kinetics, and fine grain size.

Active Publication Date: 2018-03-27
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the annealing treatment can significantly improve the A 2 B 7 type phase content, but a single type of A 2 B 7 Difficult to obtain

Method used

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  • la-mg-ni hydrogen storage alloy and preparation method thereof
  • la-mg-ni hydrogen storage alloy and preparation method thereof
  • la-mg-ni hydrogen storage alloy and preparation method thereof

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preparation example Construction

[0029] The inventors of the present invention provide a method for preparing a La-Mg-Ni hydrogen storage alloy. Such as figure 1 As shown, the preparation method includes the following steps: melting the mixed metal raw materials prepared in proportion to obtain a liquid alloy; spraying the liquid alloy on a cooling roll for rapid cooling to obtain a rapidly quenched alloy, wherein the surface line of the cooling roll The speed is 3-8m / s; heat treatment is carried out on the rapidly quenched alloy. The steps of heat treatment include: under the protection of inert gas, first keep warm at 500-600°C for 1-2 hours, and then keep warm at 700-800°C for 1 hour ~ 2 hours, and finally keep warm at 800 ~ 900 ℃ for 2 ~ 6 hours.

[0030] Above-mentioned preparation method adopts medium and low speed rapid quenching method to AB 5 The content of the type phase is suppressed in an appropriate range, and at the same time, a rapidly quenched alloy with uniform composition and structure is ...

Embodiment 1

[0050] The chemical formula of the La-Mg-Ni hydrogen storage alloy provided in this embodiment is La 1.8 Mg 0.2 Ni 7 , and the XRD analysis shows that the La-Mg-Ni hydrogen storage alloy is only composed of a single A 2 B 7 Phase composition. Its preparation method comprises the following steps:

[0051] (1) The raw materials are proportioned to obtain mixed metal raw materials; the vacuum induction melting furnace is evacuated to 1×10 -4 Below Pa, fill it with argon to normal pressure, then evacuate again to 1×10 -4 Below Pa, it is filled with 0.01MPa high-purity helium for protection; the mixed metal raw material is melted at a temperature of 1573K-1873K, and kept for 1 minute to obtain a liquid alloy.

[0052] (2) Spray the liquid alloy on the water-cooled copper roll for rapid cooling. The surface linear velocity of the copper roll is 5m / s to obtain a rapidly quenched alloy with a thickness of 70 μm; XRD analysis shows that the crystal of the obtained rapidly quenche...

Embodiment 2

[0055] The chemical formula of the La-Mg-Ni hydrogen storage alloy provided in this embodiment is La 1.5 Mg 0.5 Ni 7 , and the XRD analysis shows that the La-Mg-Ni hydrogen storage alloy is only composed of a single A 2 B 7 Phase composition. Its preparation method comprises the following steps:

[0056] (1) The raw materials are proportioned to obtain mixed metal raw materials; the vacuum induction melting furnace is evacuated to 1×10 -4 Below Pa, fill it with argon to normal pressure, then evacuate again to 1×10 -4 Below Pa, it is filled with 0.1MPa high-purity helium for protection; the mixed metal raw material is melted at a temperature of 1573K-1873K, and kept for 1 minute to obtain a liquid alloy.

[0057](2) Spray the liquid alloy on the water-cooled copper roll for rapid cooling. The surface linear velocity of the copper roll is 5m / s to obtain a rapidly quenched alloy with a thickness of 70 μm; XRD analysis shows that the crystal of the obtained rapidly quenched ...

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Abstract

The invention provides a La-Mg-Ni hydrogen storage alloy and a preparation method thereof. The preparation method includes the following steps that a mixed metal raw material prepared in proportion is smelted to obtain a liquid alloy; the liquid alloy is sprayed to a cooling roller to be quickly cooled, so that a rapidly-quenched alloy is obtained, and the surface linear speed of the cooling roller is 3-8 m / s; and the rapidly-quenched alloy is subjected to thermal treatment which includes the steps of preserving heat for 1-2 hours at the temperature of 500-600 DEG C under the protection of inert gas, then preserving heat for 1-2 hours at the temperature of 700-800 DEG C, and finally preserving heat for 2-6 hours at the temperature of 800-900 DEG C. By means of the preparation method, the La-Mg-Ni hydrogen storage alloy with the single A2B7 phase can be obtained; meanwhile, grains of the rapidly-quenched alloy are fine, transformation kinetics is rapid, and therefore the La-Mg-Ni hydrogen storage alloy with the single A2B7 phase can be obtained through short annealing time. In addition, the method is easy to master and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage materials, and in particular relates to a La-Mg-Ni hydrogen storage alloy and a preparation method thereof. Background technique [0002] As a new generation of nickel-hydrogen battery anode materials, La-Mg-Ni (3≤B / A<5) hydrogen storage alloys are superior to traditional AB in terms of discharge capacity and high-rate discharge capability. 5 Type alloys have greater potential. However, the rapid capacity fading of La-Mg-Ni hydrogen storage alloys during electrochemical cycling is the biggest bottleneck restricting their applications. Therefore, how to improve the electrochemical cycle stability under the premise of ensuring high capacity and rate discharge capability has become the key to the development of this series of alloys. [0003] Studies have shown that the important reason for the failure of La-Mg-Ni alloy is the corrosion of the alloy in alkaline solution. From the persp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22C1/02C22F1/10
CPCC22C1/023C22C19/03C22F1/10
Inventor 李一鸣刘卓承段宝玉任慧平张羊换
Owner INNER MONGOLIA UNIV OF SCI & TECH
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