REMg3 type hydrogen storage alloy and its preparation method

A hydrogen storage alloy, re1.2-xmg3niy technology, applied in the field of hydrogen storage materials, can solve the problems of high price, poor hydrogen storage performance, difficult control of alloy structure and phase abundance, etc., and achieves simple and easy manufacturing process, power The effect of good chemical performance and good cycle stability

Active Publication Date: 2005-08-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0031] (1) Alloy Mg 75 Ni 20 Mmm 5 The dehydrogenation pressure platform is too low, it is not easy to activate, and it is difficult to promote to practical application;
[0032] (2) Alloy Mm 1-y m y (NiCoN) x Contains expensive metal elements such as Mo, Co, Pt, Hf, Ta, Ge, etc., and the cost is high;
[0033] (3) Alloy Mm 1-y m y (NiCoN) x Contains V, Zr, Pd, Cd, In and other metal elements that will cause serious environmental pollution, which will pollute the environment;
[0034] (4) Alloy A 1-y B y C x Does not contain Ni element, so that its hydrogen storage performance is poor;
[0035] (5) The existing production process is prepared by melting in a vacuum magnetic levitation furnace or an electric arc furnace, which is difficult to operate and difficult to carry out mass production;
[0036] (6)Ml 1-x Mg x Ni y (0.02≤x≤0.8, 2≤y≤4) alloy structure and phase abundance are difficult to control, the preparation process includes smelting, homogenization annealing, mechanical alloying and other processes, the preparation process is complicated, and the nickel content is high, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The weight percent composition of the bulk mixed rare earth is selected as La40%, Nd41%, Ce5%, Pr13%, and the rest are other rare earth elements and impurities. Magnesium is a bulk metal with a purity of 99%. Brush off the oxide layer on the surface of the metal raw material, wash it, dry it, weigh it according to the stoichiometric ratio, weigh 689g of mixed rare earth, and place 1311g of metal magnesium in the graphite crucible of the vacuum induction furnace, cover the furnace cover, and evacuate to a vacuum degree 10 -2 Pa, fill with argon (Ar) gas until the pressure reaches 0.03Mpa, adjust the power to 15kw, and control the temperature at 950°C to melt the metal, keep warm and fully stir, and the melting time is 30 minutes. After the smelting, the molten metal is poured into the water-cooled ingot mold, and it is released after cooling. The X-ray diffraction results prove that the main phase of the alloy is CeMg. 3 type.

[0054] The P-C-I curve of the as-cast a...

Embodiment 2

[0056] The weight percent composition of the bulk mixed rare earth is selected as La33%, Nd12%, Ce49%, Pr6%, and the rest are other rare earth elements and impurities. Magnesium is a bulk metal with a purity of 99%, and nickel is an electrolytic nickel with a purity of 99.99%. Brush the metal raw material to remove the surface oxide layer, wash it, dry it, weigh it according to the stoichiometric ratio, weigh 1167g of mixed rare earth, 613g of metal magnesium, and 219g of metal nickel and place it in the graphite crucible of the vacuum induction furnace, cover the furnace cover, Vacuum down to a vacuum of 10 -3 Pa, fill with argon (Ar) gas until the pressure reaches 0.01Mpa, adjust the power to 5kw, and control the temperature at 1000°C to melt the metal, keep warm and fully stir, and the melting time is 35 minutes. After the smelting, the molten metal is poured into the water-cooled ingot mold, and it is released after cooling. The X-ray diffraction results prove that the ma...

Embodiment 3

[0059] The weight percent composition of the mass mixed rare earth is selected as La32%, Nd14%, Ce50%, Pr4%, and the rest are other rare earth elements and impurities. Magnesium is a bulk metal with a purity of 99%, and nickel is an electrolytic nickel with a purity of 99.99%. Brush the metal raw material to remove the surface oxide layer, wash it, dry it, weigh it according to the stoichiometric ratio, weigh 1167g of mixed rare earth, 613g of metal magnesium, and 22g of metal nickel and place it in the graphite crucible of the vacuum induction furnace, cover the furnace cover, Vacuum down to a vacuum of 10 -3 Pa, fill in nitrogen until the air pressure reaches 0.07Mpa, adjust the power to 12kw, control the temperature at 1100°C to melt the metal, keep warm and fully stir, and the melting time is 35 minutes. After the smelting is completed, the molten metal is poured into the water-cooled ingot mold, and it is released after cooling.

[0060] The P-C-I curve of the as-cast a...

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PUM

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Abstract

A hydrogen bearing REMg3 alloy has a molecular formula: RE1.2-xMg3Niy, where RE is rare-earth mixture, x=0-0.4 and y=0-1. Its preparing process includes proportionally loading RE, Mg and Ni in crucible of induction furnace, vacuumizing, filling protective gas, smelting and cooling.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage materials, in particular to a REMg 3 Type hydrogen storage alloy and its preparation method. Background technique [0002] The hydrogen storage alloys currently used and researched can be divided into AB according to the composition and structure 5 Type rare earth series, AB 2 Type Laves phase, V-based solid solution type, AB type, A 2 B and AB 3 There are six types of alloys, in which A is a hydrogen-absorbing component, and B is a catalytic pair component for hydrogen absorption. Table 1-1 lists the performance parameters of several main hydrogen storage alloys (metals). [0003] Table 1-1 Performance parameters of several typical hydrogen storage alloys (metals) [0004] Equilibrium pressure (temperature) [0005] Type Hydride Hydrogen storage capacity (wt.%) [0006] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/00C22C28/00C22C30/00
Inventor 欧阳柳章彭成红童燕青朱敏
Owner SOUTH CHINA UNIV OF TECH
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