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Non-stoichiometry zirconium-iron base high-pressure hydrogen storage alloy and preparation method thereof

A non-stoichiometric, hydrogen storage alloy technology, applied in the field of non-stoichiometric zirconium-iron-based high-pressure hydrogen storage alloys and their preparation, can solve problems such as application limitations, and achieve the effects of simple operation, low temperature, and easy mass production

Inactive Publication Date: 2018-11-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at 20°C, the platform pressure of this type of material is 69.9MPa for hydrogen absorption and 32.9MPa for dehydrogenation. The excessively high platform pressure exceeds the application pressure range under many conditions, which limits its application.

Method used

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  • Non-stoichiometry zirconium-iron base high-pressure hydrogen storage alloy and preparation method thereof
  • Non-stoichiometry zirconium-iron base high-pressure hydrogen storage alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to Zr 1.05 Fe 1.9 Cr 0.1 The stoichiometric ratio of zirconium, iron and chromium is 46.24%, 51.24% and 2.52% in mass fractions, weighing about 10g of raw metal blocks, in which the purity of zirconium is greater than 99.4%, the purity of iron is greater than 99.9%, and the purity of chromium is greater than 99.9% %; put the weighed metal block into the crucible of the high-vacuum non-consumable electrode arc melting furnace after mixing evenly, and use a mechanical pump and a molecular pump to vacuum the furnace chamber of the high-vacuum non-consumable electrode arc melting furnace to 2.0×10 -3 ~1.0×10 -3 Pa, argon gas with a purity of 99.999% is introduced to 500Pa. Adjust the power, control the smelting temperature, smelt at a temperature higher than 1800°C for 2-3 minutes, turn over the sample and continue smelting after cooling, and repeat this 5-6 times to obtain alloy ingots. The alloy ingot was crushed under argon atmosphere to obtain powder samp...

Embodiment 2

[0030] According to Zr 1.05 Fe 1.85 Cr 0.15 The stoichiometric ratio of zirconium, iron and chromium is 46.29%, 49.94%, and 3.77% in mass fractions. Weigh a total of about 10g of raw metal blocks, of which the purity of zirconium is greater than 99.4%, the purity of iron is greater than 99.9%, and the purity of chromium is greater than 99.9% %; put the weighed metal block into the crucible of the high-vacuum non-consumable electrode arc melting furnace after mixing evenly, and use a mechanical pump and a molecular pump to vacuum the furnace chamber of the high-vacuum non-consumable electrode arc melting furnace to 2.0×10 -3 ~1.0×10 -3 Pa, argon gas with a purity of 99.999% is introduced to 500Pa. Adjust the power, control the smelting temperature, smelt at a temperature higher than 1800°C for 2-3 minutes, turn over the sample and continue smelting after cooling, and repeat this 5-6 times to obtain alloy ingots. The alloy ingot was crushed under argon atmosphere to obtain ...

Embodiment 3

[0033] According to Zr 1.05 Fe 1.8 Cr 0.2 The stoichiometric ratio of zirconium, iron and chromium is 46.36%, 48.61% and 5.03% in mass fractions. Weigh about 10g of the raw metal block, in which the purity of zirconium is greater than 99.4%, the purity of iron is greater than 99.9%, and the purity of chromium is greater than 99.9% %; put the weighed metal block into the crucible of the high-vacuum non-consumable electrode arc melting furnace after mixing evenly, and use a mechanical pump and a molecular pump to vacuum the furnace chamber of the high-vacuum non-consumable electrode arc melting furnace to 2.0×10 -3 ~1.0×10 -3 Pa, argon gas with a purity of 99.999% is introduced to 500Pa. Adjust the power, control the smelting temperature, smelt at a temperature higher than 1800°C for 2-3 minutes, turn over the sample and continue smelting after cooling, and repeat this 5-6 times to obtain alloy ingots. The alloy ingot was crushed under argon atmosphere to obtain powder samp...

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Abstract

The invention belongs to the field of hydrogen storage alloy materials, and discloses a non-stoichiometry zirconium-iron base high-pressure hydrogen storage alloy and a preparation method thereof. A chemical formula of the alloy is Zr1.05Fe2-xCrx, wherein x is not more than 0.25 and not less than 0.1. The preparation method comprises the following steps: raw material metal blocks are weighed according to chemical metering ratio in the chemical formula of the alloy, are smelted under the condition of the temperature higher than 1800 DEG C, and are cooled to obtain an alloy ingot; and the alloyingot is crushed to a powder state to obtain the zirconium-iron base high-pressure hydrogen storage alloy. The non-stoichiometry zirconium-iron alloy can adjust the hydrogen absorption / release platform pressure through change the chromium content to control the thermodynamic property of the alloy. The alloy is stable in structure, keeps a crystal structure invariable after multiple times of hydrogen absorption / release cycles, and generates no disproportionation and decomposition phenomenon of materials.

Description

technical field [0001] The invention belongs to the field of hydrogen storage alloy materials, and in particular relates to a non-stoichiometric zirconium-iron-based high-pressure hydrogen storage alloy and a preparation method thereof. Background technique [0002] Hydrogen has the characteristics of wide sources, pollution-free, renewable, and high calorific value. Accelerating the development of hydrogen energy economy and realizing the large-scale application of hydrogen energy are of great significance to solving energy crisis, environmental problems and achieving sustainable development. However, the storage and transportation of hydrogen has become a technical factor that restricts the popularization and application of hydrogen energy. In 2015, Toyota Corporation of Japan launched the Mirai hydrogen fuel cell vehicle, marking the further development of hydrogen energy commercialization and home application. The Mirai hydrogen fuel cell vehicle adopts a high-pressure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C33/04H01M4/38
CPCC22C33/04C22C38/28H01M4/383Y02E60/10
Inventor 王辉周超朱敏欧阳柳章刘江文曾美琴
Owner SOUTH CHINA UNIV OF TECH
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