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Rare earth tin-based low-temperature magnetic refrigeration material and preparation method thereof

A low-temperature magnetic refrigeration, tin-based technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of complex single crystal preparation technology, unfavorable mass production, cumbersome preparation process, etc., to achieve abundant reserves, low cost, simple craftsmanship

Inactive Publication Date: 2011-08-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of mass production, the gadolinium gallium garnet compound Gd 3 Ga 5 o 12 (GGG) and dysprosium aluminum garnet compound Dy 3 Al 5 o 12 (DAG) single crystal, gadolinium gallium aluminum garnet compound Gd 3 (Ga 1-x Al x ) 5 o 12 Single crystal has disadvantages such as complex preparation technology and high cost
Gallium-gadolinium garnet compound Gd 3 Ga 5-x Fe x o 12 (GGIG) preparation process is also relatively cumbersome, which is not conducive to mass production

Method used

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  • Rare earth tin-based low-temperature magnetic refrigeration material and preparation method thereof
  • Rare earth tin-based low-temperature magnetic refrigeration material and preparation method thereof
  • Rare earth tin-based low-temperature magnetic refrigeration material and preparation method thereof

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Effect test

Embodiment 1

[0029] A rare-earth tin-based low-temperature magnetic refrigeration material, the preparation method of which is as follows:

[0030] Step 1: Press Ho and Sn according to Ho 5 sn 4 (atomic ratio) ratio batching; The sample gross weight is 10g, and wherein Ho, Sn are respectively 6.346g, 3.654g.

[0031] Step 2: Put the raw materials prepared in Step 1 into the electric arc furnace, and evacuate to 10 -3 Pa, after cleaning the furnace with high-purity argon, fill it with high-purity argon slightly lower than 1 atmosphere (about 0.1MPa), and repeatedly smelt it for 4 times under the protection of high-purity argon, and obtain a button-shaped casting with uniform composition after cooling. ingot;

[0032]Step 3: Wrap the smelted ingot with tantalum foil, place it in a high-vacuum induction heating annealing furnace, anneal at 1573K for 24 hours, and then cool with the furnace.

[0033] X-ray diffraction of the samples thus prepared proved that the alloy consisted of three ph...

Embodiment 2

[0038] A rare-earth tin-based low-temperature magnetic refrigeration material, the preparation method of which is as follows:

[0039] Step 1: Press Er and Sn by Er 5 sn 4 (atomic ratio) ratio batching; The sample gross weight is 10g, and wherein Er, Sn are 6.378g, 3.622g respectively.

[0040] Step 2: Put the raw materials prepared in Step 1 into the electric arc furnace, and evacuate to 10 -3 Pa, after cleaning the furnace with high-purity argon, fill it with high-purity argon slightly lower than 1 atmosphere (about 0.1MPa), and repeatedly smelt it for 4 times under the protection of high-purity argon, and obtain a button-shaped casting with uniform composition after cooling. ingot;

[0041] Step 3: Wrap the smelted ingot with tantalum foil, place it in a high-vacuum induction heating annealing furnace, anneal at 1573K for 24 hours, and then cool with the furnace.

[0042] X-ray diffraction of the samples thus prepared proved that the alloy consisted of three phases, nam...

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Abstract

The invention relates to the field of magnetic materials, and discloses a rare earth tin-based low-temperature magnetic refrigeration material. A general chemical formula of the magnetic refrigeration material is R5Sn4; and in the formula, R is Ho or Er. A method for preparing the magnetic refrigeration material comprises the following steps of: (1) weighing 60 to 70 mass percent of rare earth metal R and 30 to 40 mass percent of weak metal Sn and mixing; (2) repeatedly smelting mixed raw materials to obtain an alloy cast ingot with uniform ingredients; and (3) annealing the alloy cast ingot under vacuum at the temperature of 1,573K for 24 hours, and cooling in a furnace to obtain the rare earth tin-based low-temperature magnetic refrigeration material R5Sn4. A main raw material Sn adopted by the method is cheap and has abundant reserves in natural world; the prepared product R5Sn4 shows second-order phase transition in the magnetization process; and the preparation method is simple and low in cost, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to a magnetic material, in particular to a rare earth tin-based magnetic refrigeration material and a preparation method thereof. Background technique [0002] In today's science and technology and the field of life, refrigeration technology is essential. Due to the increasingly serious damage to the ecological environment, especially the atmospheric ozone layer, caused by the traditional compression refrigeration Freon (Freon) refrigerant, which threatens the survival and safety of human beings themselves, coupled with the low efficiency and high energy consumption of gas compression refrigeration, the traditional compression refrigeration Technology is in trouble. Magnetic refrigeration technology has the advantages of high efficiency, energy saving, and no environmental pollution. It is a typical high-tech "green" environmental protection refrigeration technology. The basic principle of magnetic refrigeration is to use the ma...

Claims

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Application Information

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IPC IPC(8): C22C28/00C22C1/02C22F1/02C22F1/16C09K5/14
Inventor 钟喜春曾德长刘仲武邱万奇余红雅
Owner SOUTH CHINA UNIV OF TECH
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