Rare earth-aluminum material used for magnetic refrigeration, and preparation method and application thereof

A technology for magnetic refrigeration and aluminum materials, applied in the field of rare earth-aluminum materials and their preparation, can solve problems such as inability to meet demand, damage to climate and environment, and achieve the effects of strong refrigeration capacity and increased magnetic entropy

Inactive Publication Date: 2013-01-30
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, as people have paid more and more attention to environmental protection, the traditional refrigeration technology using fluorine refrigerants has been unable to meet the needs of modern society due to its damage to the climate and environment.

Method used

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  • Rare earth-aluminum material used for magnetic refrigeration, and preparation method and application thereof
  • Rare earth-aluminum material used for magnetic refrigeration, and preparation method and application thereof
  • Rare earth-aluminum material used for magnetic refrigeration, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: This embodiment is used to illustrate the magnetic refrigeration material and its preparation method provided by the present invention

[0038] 1. Preparation method:

[0039] 1) Press Ho 3 Al 2 The atomic ratio in the chemical formula is weighed, and the commercially available rare earth metal Ho with a purity higher than 99.9% is mixed with the Al raw material, wherein Ho is excessively added by 2% (atomic percentage);

[0040] 2) Put the raw materials prepared in step 1) into the electric arc furnace to vacuumize, when the vacuum degree reaches 3×10 -3Pa, after cleaning twice with pure argon, smelting under the protection of 1 atmosphere of pure argon, the smelting time is 3 minutes, and the smelting temperature is 1500-1550°C;

[0041] 3) Cool the as-cast alloy in a copper crucible, wrap the as-cast alloy with molybdenum foil, and seal it in a vacuum of 5×10 -3 In a Pa quartz tube, it was annealed at 800°C for 7 days, taken out and quickly quench...

Embodiment 2

[0050] Example 2: This example is used to illustrate the magnetic refrigeration material provided by the present invention and its preparation method

[0051] 1. Preparation method:

[0052] 1) Press Tb 3 al 2 The atomic ratio in the chemical formula is weighed, and the commercially available rare earth metal Tb with a purity higher than 99.9% is mixed with the Al raw material, wherein Tb is excessively added by 2% (atomic percentage);

[0053] 2) Put the raw materials prepared in step 1) into the electric arc furnace to vacuumize, when the vacuum degree reaches 3×10 -3 Pa, after cleaning twice with pure argon, smelting under the protection of 1 atmosphere of pure argon, the smelting time is 3 minutes, and the smelting temperature is 1500-1550°C;

[0054] 3) Cool the as-cast alloy in a copper crucible, wrap the as-cast alloy with molybdenum foil, and seal it in a vacuum of 5×10 -3 In the quartz tube of Pa, it was annealed at 950°C for 14 days, taken out and quickly quenc...

Embodiment 3

[0061] Example 3: This example is used to illustrate the magnetic refrigeration material provided by the present invention and its preparation method

[0062] 1. Preparation method:

[0063] 1) Press Dy 3 Al 2 The atomic ratio in the chemical formula is weighed, and the commercially available rare earth metal Dy with a purity higher than 99.9% is mixed with the Al raw material, wherein Dy is excessively added by 2% (atomic percentage);

[0064] Step 2) and step 3) are identical with embodiment 2.

[0065] 2. Product characterization and performance measurement:

[0066] The room temperature X-ray diffraction spectrum of the compound obtained in this embodiment is as follows: Figure 11 As shown, the results show that the product is a single-phase Zr 3 Al 2 Dy of type tetragonal crystal structure 3 Al 2 compound whose space group is P4 2 nm, the lattice parameter is α=β=γ=90°.

[0067] Dy in this embodiment 3 Al 2 In the magnetic field strength μ 0 The thermoma...

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Abstract

The invention provides a rare earth-aluminum material used for magnetic refrigeration, and a preparation method and an application thereof. The material is a compound having the following general formula R3Al2, wherein R represents any one element of Gd, Tb, Dy, Ho and Er or a combination of Ho element and any one of Gd, Tb, Dy and Er. The magnetic refrigeration material has a Zr3Al2 type tetragonal crystal structure. The rare earth-aluminum material provided by the invention, particularly Ho3Al2 has an antiferromagnetic-ferromagnetic phase transition and a ferromagnetic-paramagnetic phase transition, presents a relatively large magnetic entropy change and a wide working temperature zone nearby a phase-transition temperature. The rare earth-aluminum material has a relatively large magnetic refrigeration capacity and good thermal reversibility and magnetic reversibility, and is a very ideal magnetic refrigeration material.

Description

technical field [0001] The invention relates to magnetic materials, in particular to a rare earth-aluminum material used for magnetic refrigeration and its preparation method and application. Background technique [0002] In recent years, with people's increasing emphasis on environmental protection, the traditional refrigeration technology using fluorine refrigerants has been unable to meet the needs of modern society because of its damage to the climate and environment. Magnetic refrigeration is based on the magnetocaloric effect (MCE) of magnetic materials, that is, the magnetic refrigeration material releases heat to the outside when it is isothermally magnetized, and absorbs heat from the outside when it is adiabatically demagnetized, so as to achieve the purpose of refrigeration. Compared with the traditional gas compression refrigeration technology, magnetic refrigeration uses magnetic materials as the refrigerant, which has significant advantages such as no damage to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C28/00C22C1/02C09K5/02
Inventor 张虎沈保根许志一吴剑峰沈俊
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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