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Material used for magnetic refrigeration, and preparation method and application thereof

A magnetic refrigeration and structural material technology, applied in the field of magnetic refrigeration materials and its preparation, can solve the problems of magnetic entropy change, insufficient magnetic refrigeration capacity, and commercial application limitations, and achieve good uniformity, good single-phase, and color uniform effect

Active Publication Date: 2014-02-12
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the magnetic entropy change and magnetic refrigeration capacity of these magnetic refrigeration materials in the above temperature range are not large enough, the commercial application is limited to a certain extent.

Method used

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  • Material used for magnetic refrigeration, and preparation method and application thereof
  • Material used for magnetic refrigeration, and preparation method and application thereof
  • Material used for magnetic refrigeration, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] This embodiment is used to illustrate ErNi 0.9 Materials and their preparation methods.

[0080] ErNi 0.9 The preparation method comprises the following steps:

[0081] (1) Weigh the raw materials of rare earth metal Er and metal Ni, wherein the purity of rare earth metal Er and metal Ni is higher than 99.9%, and the amount of rare earth metal Er is according to the ratio chemical formula ErNi 0.9 An excess of 2% is weighed, and the rare earth metal Er and metal Ni are mixed;

[0082] (2) Put the mixed material obtained in step (1) into a copper crucible, place it in an electric arc furnace, and evacuate it. When the vacuum degree reaches 3×10 -3Pa, with a purity of 99.999% high-purity argon cleaning 2 times, and under the protection of 1 atmospheric pressure of high-purity argon smelting 4 times, the smelting temperature is 1600 ° C, each smelting time is 1 minute, after smelting The material is cooled to room temperature with the furnace to obtain the cast alloy; ...

Embodiment 2

[0092] This example is used to illustrate the ErNi material and its preparation method.

[0093] The preparation method of ErNi comprises the following steps:

[0094] (1) Weigh the raw materials of rare earth metal Er and metal Ni, wherein the purity of rare earth metal Er and metal Ni is higher than 99.9%, and the amount of rare earth metal Er is weighed according to the amount of 2% excess of the chemical formula ErNi, and the rare earth metal Metal Er and metal Ni are mixed;

[0095] (2) Put the mixed material obtained in step (1) into a copper crucible, place it in an electric arc furnace, and evacuate it. When the vacuum degree reaches 3×10 -3 Pa, with a purity of 99.999% high-purity argon purge 2 times, and under the protection of 1 atmospheric pressure of high-purity argon for 4 times, the smelting temperature is 1600 ° C, and the smelting time is 1 minute each time. Afterwards, the material is cooled to room temperature with the furnace to obtain the cast alloy;

...

Embodiment 3

[0103] This example is used to illustrate Ho 0.05 Er 0.95 Ni material and its preparation method.

[0104] Ho 0.05 Er 0.95 The preparation method of Ni comprises the following steps:

[0105] (1) Weigh the raw materials of rare earth metal Ho, Er and metal Ni, wherein the purity of rare earth metal Ho, Er and metal Ni is higher than 99.9%, and the amount of rare earth metal Ho and Er is according to the ratio chemical formula Ho 0.05 Er 0.95 The amount of Ni excess 2% is weighed, and the rare earth metal Ho, Er are mixed with metal Ni;

[0106] (2) Put the mixed material obtained in step (1) into a copper crucible, place it in an electric arc furnace, and evacuate it. When the vacuum degree reaches 3.0×10 -3 Pa, with a purity of 99.999% high-purity argon cleaning 2 times, and under the protection of 1 atmospheric pressure of high-purity argon smelting 4 times, the smelting temperature is 1600 ° C, each smelting time is 1 minute, after smelting The material is cooled to ...

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Abstract

The invention provides a material used for magnetic refrigeration, and the material has the chemical formula of HoxEr1-xNiy, wherein 0<=x<1, 0.8<y<=1, and the material has a FeB-type tetragonal cubic crystal structure. The invention also provides a preparation method of the material used for magnetic refrigeration. The preparation method comprises the following steps: (1) weighing metal raw materials such as Ho, Er and Ni, mixing, wherein the raw material Ni is weighed according to the mole number in the chemical formula, and the raw material Ho and Er are respectively weighed according to an excessive 1-5% mole number according to the mole number in the chemical formula; (2) putting the mixed material obtained in the step (1) into a reaction furnace, vacuumizing, washing with rare gases, then melting under the protection of rare gases; (3) performing vacuum annealing processing on the material subjected to melting and obtained in the step (2); and (4) performing shock cooling on the material subjected to vacuum annealing processing and obtained in the step (3) to prepare the target material. The material has high magnetic refrigeration performance and good thermal reversible property, and is an extremely ideal magnetic refrigeration working substance.

Description

technical field [0001] The invention relates to magnetic materials, in particular to a material used for magnetic refrigeration and its preparation method and application. Background technique [0002] Human life in modern society is increasingly inseparable from refrigeration technology. At present, gas compression refrigeration technology is widely used to achieve refrigeration. However, traditional gas compression refrigeration technology has problems such as high energy consumption and unfriendly environment. Therefore, it is of great significance to explore new refrigeration technologies that are both energy-saving and environmentally friendly. [0003] Compared with traditional gas compression refrigeration technology, magnetic refrigeration technology has significant advantages such as high efficiency, energy saving, environmental protection, and stable operation, and has the potential to become a new generation of refrigeration technology. Magnetic refrigeration tec...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22C1/02C22F1/10
Inventor 郑新奇沈保根胡凤霞孙继荣
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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