Method for synthesizing La-Mg hydrogen storage alloy by microwave aid heating

A hydrogen storage alloy, microwave-assisted technology, applied in microwave heating and other directions, can solve the problems of difficulty in large-scale production, long time-consuming, time-consuming process, etc., and achieves the promotion of endothermic and exothermic reactions, favorable thermodynamic conditions, and high heating efficiency. Effect

Inactive Publication Date: 2010-11-17
SHANGHAI UNIV
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AI Technical Summary

Problems solved by technology

Since La is easy to oxidize and Mg is easy to volatilize, the smelting method requires high temperature for preparing samples, and multiple remelting and composition adjustments must be carried out, which consumes energy, time and complicated processes; The sample is prepared by interdiffusion under the environment, which has the characteristics of mild preparation conditions, simple and convenient, etc., but it takes a long time, and the general process time is about 5-10h; the mechanical alloying method is a solid state reaction method for preparing fine powder. It does not use any heating means, but uses mechanical energy to directly produce alloys by solid-state reaction at a temperature far below the melting point of the material, thus avoiding the shortcomings of the smelting method, but it requires a long time of ball milling (10-20h). On the one hand, the production efficiency On the other hand, it is easy to introduce oxygen and iron pollution, and it is difficult to produce on a large scale; the hydrogenation combustion method is to prepare alloys through solid-phase reactions under high-pressure hydrogen atmosphere, which has great advantages in energy saving and time saving, but due to the need Hydrogen high-pressure atmosphere, so there is a big safety hazard, and it brings great difficulties to large-scale manufacturing

Method used

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  • Method for synthesizing La-Mg hydrogen storage alloy by microwave aid heating
  • Method for synthesizing La-Mg hydrogen storage alloy by microwave aid heating
  • Method for synthesizing La-Mg hydrogen storage alloy by microwave aid heating

Examples

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Embodiment 1

[0023] Embodiment 1: take by weighing lanthanum powder (purity 99.83%, particle diameter 100 meshes), magnesium powder (purity 99.9%, particle diameter 200 meshes) by weighing by stoichiometric ratio 1: 8.5 and mix, place QF-1sp type planetary type simultaneously Mix thoroughly in a ball mill. In order to prevent oxidation during the ball milling process, the samples in the ball milling tank were carried out in a glove box. The volume of the ball mill jar used is 80cm 3 , the ball-to-material ratio is 10:1 (using 150g grinding balls / 15g powder), and the rotating speed of the main shaft during ball milling is 200 rpm. After mixing well, keep the pressure under the pressure of 450MPa for 2min, and compress into tablets (Φ15×2mm discs) on a 769YP-24B powder tablet press. The tableted sample is placed in a microwave tube furnace, and argon gas with a purity ≥ 99.999% is introduced for protection after vacuuming. Turn on the microwave power supply, raise the temperature of the s...

Embodiment 2

[0025] Weigh lanthanum powder (purity 99.83%, particle size 100 mesh) and magnesium powder (purity 99.9%, particle size 200 mesh) according to the stoichiometric ratio of 1:8.5 and mix them, and place them in a QF-1sp planetary ball mill for full mixing . In order to prevent oxidation during the ball milling process, the samples in the ball milling tank were carried out in a glove box. The volume of the ball mill jar used is 80cm 3 , the ball-to-material ratio is 10:1 (using 150g grinding balls / 15g powder), and the rotating speed of the main shaft during ball milling is 200 rpm. After mixing well, keep the pressure under the pressure of 450MPa for 2min, and compress into tablets (Φ15×2mm discs) on a 769YP-24B powder tablet press. The pressed sample was placed in a microwave tube furnace, and after vacuuming, a furnace containing 5at% H 2 A mixture of hydrogen and argon for protection. Turn on the microwave power supply, raise the temperature of the sample to 680°C at a hea...

Embodiment 3

[0027]Weigh lanthanum powder (purity 99.83%, particle size 100 mesh) and magnesium powder (purity 99.9%, particle size 100 mesh) according to the stoichiometric ratio of 1:12, mix them, and place them in a QF-1sp planetary ball mill for full mixing . In order to prevent oxidation during the ball milling process, the samples in the ball milling tank were carried out in a glove box. The volume of the ball mill jar used is 80cm 3 , the ball-to-material ratio is 10:1 (using 150g grinding balls / 15g powder), and the rotating speed of the main shaft during ball milling is 200 rpm. After mixing well, keep the pressure under the pressure of 450MPa for 2min, and compress into tablets (Φ15×2mm discs) on a 769YP-24B powder tablet press. The tableted sample is placed in a microwave tube furnace, and argon gas with a purity ≥ 99.999% is introduced for protection after vacuuming. Turn on the microwave power supply, raise the temperature of the sample to 680°C at a heating rate of 30°C / min...

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Abstract

The invention relates to a method for synthesizing La-Mg hydrogen storage alloy by microwave aid heating, which belongs to the technical field of metal functional material hydrogen storage alloy preparation processes. The method mainly comprises the following steps of: weighing lanthanum powder and magnesium powder in a certain stoichiometric ratio of 1: 8.5-1: 12, and mixing the raw materials uniformly by adopting a pre-ball-milling process; pressing the mixed raw materials into circular cakes of phi15mm*(2-3)mm on a powder tablet press under the pressure of 300 to 900MPa; then placing the pressed sample into a microwave tube type furnace, pumping vacuum and then introducing high-purity argon into the furnace to protect the sample, turning on a microwave power supply, heating the sample to between 680 and 700 DEG C, preserving the heat for 10 to 60 minutes, and then cooling the sample to room temperature; and activating the synthesized La-Mg alloy, absorbing hydrogen at the temperature of 350 DEG C under the hydrogen pressure of 5MPa, and finally obtaining the hydrogen storage alloy. The La-Mg hydrogen storage alloy prepared by the method has high hydrogen absorption and release performance.

Description

technical field [0001] The invention relates to a method for synthesizing a La-Mg hydrogen storage alloy by microwave-assisted heating, and belongs to the technical field of preparation technology of metal functional material hydrogen storage alloy. Background technique [0002] With the depletion of fossil energy, hydrogen energy as a clean, non-polluting green energy will occupy an important position in the future energy, and its development and research have aroused great interest. The key issues in the development and utilization of hydrogen energy are safe and reliable hydrogen storage technology and finding ideal hydrogen storage materials. In the research of hydrogen storage technology, considering factors such as volume hydrogen storage density, hydrogen storage energy consumption, and safety, Metal-based hydrogen storage alloys are currently recognized as one of the best hydrogen storage methods. Among them, magnesium-based hydrogen storage alloys are favored becau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06H05B6/80
Inventor 李谦叶丽雯张旭孟杰潘延飚姜健俊周国治
Owner SHANGHAI UNIV
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