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Yttrium-scandium-iron alloy material, yttrium-titanium-scandium-iron alloy material, preparation method and application

A ferroalloy and alloy block technology, applied in the field of hydrogen storage alloy materials, can solve the problems of reversible hydrogen storage capacity decay, unstable material structure, unfavorable commercial application, etc., and achieve small cycle hysteresis, stable structure, and dehydrogenation performance Enhanced effect

Active Publication Date: 2020-08-04
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

However, a considerable part of the rare earth hydrogen storage alloys will undergo hydrogen-induced amorphization and disproportionation reactions during the actual hydrogen absorption process, making the material structure unstable or even destroyed, resulting in a rapid decay of the reversible hydrogen storage capacity of the material, and the cycle performance is affected. Restrictions, not conducive to further commercial applications

Method used

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  • Yttrium-scandium-iron alloy material, yttrium-titanium-scandium-iron alloy material, preparation method and application
  • Yttrium-scandium-iron alloy material, yttrium-titanium-scandium-iron alloy material, preparation method and application
  • Yttrium-scandium-iron alloy material, yttrium-titanium-scandium-iron alloy material, preparation method and application

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preparation example Construction

[0067] On the other hand, the preparation method of the yttrium-scandium-iron alloy material provided by the embodiment of the present invention may include the following steps:

[0068] Step S11: Weighing the bulk metal materials of yttrium, scandium and iron according to the ratio of the substances in the general chemical formula, mixing them, melting them at a temperature higher than 1600° C., and obtaining alloy ingots after cooling.

[0069] As can be seen from the foregoing, the general chemical formula of yttrium, scandium and iron is Y 1-x sc x Fe 2 , where 0.3≤x≤0.5. For a given x, the ratio of the amount of matter of the three metal materials is determined. By mixing the weighed metal bulk materials of yttrium, scandium and iron, it is ensured that they are evenly mixed with each other, which is beneficial to the subsequent smelting process.

[0070] In one embodiment, the smelting process for the three metal materials specifically includes: repeated smelting in ...

Embodiment 1

[0090] This embodiment provides a yttrium-scandium-iron alloy material, the general chemical formula of the yttrium-scandium-iron alloy material is Y 0.9 sc 0.1 Fe 2 , the preparation method of yttrium-scandium-iron alloy material comprises the steps:

[0091] Step S311: According to the general chemical formula Y 0.9 sc 0.1 Fe 2 The ratio of the amount of material is to weigh metal blocks of yttrium, scandium and iron, melt them in an arc melting furnace at 1600 ° C for 5 minutes, and obtain alloy ingots after cooling;

[0092] Step S312: turning over the obtained alloy ingot, melting and cooling again, and repeating the melting process 6 times. Re-melting is carried out in an electric arc melting furnace with a melting temperature of 1600°C and a melting time of 5 minutes;

[0093] Step S313: Place the obtained alloy ingot into a quartz tube and seal it, and pump the air pressure in the quartz tube to 5×10 -5 Pa;

[0094] Step S314: placing the quartz tube in a box-t...

Embodiment 2

[0099] This embodiment provides a yttrium-scandium-iron alloy material, the general chemical formula of the yttrium-scandium-iron alloy material is Y 0.8 sc 0.2 Fe 2 , the preparation method of yttrium-scandium-iron alloy material comprises the steps:

[0100] Step S321: According to the general chemical formula Y 0.8 sc 0.2 Fe 2 The ratio of the amount of material is to weigh metal blocks of yttrium, scandium and iron, melt them in an arc melting furnace at 1600 ° C for 5 minutes, and obtain alloy ingots after cooling;

[0101] Step S322: Turn over the obtained alloy ingot, melt and cool again, and repeat the melting process 6 times. Re-melting is carried out in an electric arc melting furnace with a melting temperature of 1600°C and a melting time of 5 minutes;

[0102] Step S323: Place the obtained alloy ingot into a quartz tube and seal it, and pump the air pressure in the quartz tube to 5×10 -5 Pa;

[0103] Step S324: annealing the quartz tube in a box-type resist...

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Abstract

The invention relates to the field of hydrogen storage alloy materials, in particular to an yttrium-scandium-iron alloy material and an yttrium-titanium-scandium-iron alloy material. The chemical general formulas of the yttrium-scandium-iron alloy material and the yttrium-titanium-scandium-iron alloy material are respectively Y<1-x>ScxFe2 and Y<1-x-y>TiyScxFe2, wherein x is greater than or equal to 0.1 and is less than or equal to 0.5, and y is greater than or equal to 0.1 and is less than or equal to 0.2. The invention also discloses the preparation methods of the yttrium-scandium-iron alloymaterial and the yttrium-titanium-scandium-iron alloy material. The preparation method comprises the following steps of: weighing and mixing metal block materials according to the mass ratio of the general chemical formula, smelting at the temperature of higher than 1,600 DEG C, and cooling to obtain an alloy ingot; placing and sealing the alloy ingot in an annealing container, and vacuumizing theannealing container; placing the annealing container under preset conditions for sealing, and taking out an alloy block from the annealing container after cooling; and crushing the alloy block into apowder state, thereby obtaining the alloy material. The alloy material provided by the invention has a stable structure, high hydrogen storage capacity, low hydrogen absorption temperature, excellenthydrogen absorption and desorption performances, and a significantly improved dehydrogenation performance, and is beneficial to the further practical application of the alloy material in the hydrogenstorage field and the nickel-hydrogen battery field.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage alloy materials, in particular to a yttrium-scandium-iron alloy material, a yttrium-titanium-scandium-iron alloy material, a preparation method and an application. Background technique [0002] Rare earth elements have the titles of "industrial gold" and "industrial vitamins", and have important strategic status and economic value. my country is a big country with rare earth resources, and rare earth mineral resources account for 43% of the world's rare earth resources, which makes the cost of rare earths have unique advantages. However, due to the high proportion of light rare earth reserves and the very unbalanced relationship between supply and demand, the development of light rare earths in various high-end fields is restricted. Since the discovery of the light rare earth element yttrium (abbreviated as Y), rare earths have been widely used in petroleum, chemical industry, metallurgy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B22F9/02C21D6/00C21D1/26C22C33/04H01M4/38
CPCC22C38/005C22C33/04C21D6/00C21D1/26B22F9/02H01M4/383Y02E60/10
Inventor 王辉
Owner SOUTH CHINA UNIV OF TECH
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