Rare earth-iron-silicon material for magnetic refrigeration, and preparation method and application thereof

A magnetic refrigeration and silicon material technology, applied in magnetic materials, heat exchange materials, chemical instruments and methods, etc., can solve the problems of magnetic refrigeration materials such as the decrease of refrigeration rate, and achieve the effect of strong refrigeration capacity and increased magnetic entropy.

Active Publication Date: 2012-10-03
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, magnetic refrigeration materials with a first-order magnetic phase transition (such as ErCo 2 ) shows a large magnetocaloric effect, but because the first-order phase transition is usually accompanied by obvious thermal hysteresis and magnetic hysteresis, the cooling rate of the magnetic refrigeration material decreases during the cycle.

Method used

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  • Rare earth-iron-silicon material for magnetic refrigeration, and preparation method and application thereof
  • Rare earth-iron-silicon material for magnetic refrigeration, and preparation method and application thereof
  • Rare earth-iron-silicon material for magnetic refrigeration, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: This embodiment is used to illustrate the magnetic refrigeration material and its preparation method provided by the present invention

[0041] 1. Preparation method:

[0042] 1) Weighing materials according to the atomic ratio in the ErFeSi chemical formula, mixing commercially available rare earth metal Er with a purity higher than 99.9% with Fe and Si raw materials, wherein Er is excessively added by 2% (atomic percentage);

[0043] 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, melt under the protection of pure argon at 1 atmosphere, the melting time is 3 minutes, and the melting temperature is 1600-1650°C;

[0044] 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 1100°C for 35 days, taken out and quickly quenc...

Embodiment 2

[0053] Example 2: This example is used to illustrate the magnetic refrigeration material provided by the present invention and its preparation method

[0054] 1. Preparation method:

[0055] 1) Weighing materials according to the atomic ratio in the chemical formula of DyFeSi, mixing commercially available rare earth metal Dy with a purity higher than 99.9% with Fe and Si raw materials, wherein Dy is excessively added by 2% (atomic percentage);

[0056] 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, melt under the protection of pure argon at 1 atmosphere, the melting time is 3 minutes, and the melting temperature is 1600-1650°C;

[0057] 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 1100°C for 20 days, taken out and quickly quenched...

Embodiment 3

[0064] Example 3: This example is used to illustrate the magnetic refrigeration material provided by the present invention and its preparation method

[0065] 1. Preparation method:

[0066] 1) Weighing materials according to the atomic ratio in the chemical formula of TbFeSi, mixing commercially available rare earth metal Tb with a purity higher than 99.9% with Fe and Si raw materials, wherein Tb is excessively added by 2% (atomic percentage);

[0067] Step 2) and step 3) are identical with embodiment 2.

[0068] 2. Product characterization and performance measurement:

[0069] 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 TbFeSi forms a single-phase CeFeSi-type tetragonal crystal structure, its space group is P4 / nmm, and the lattice parameter is α=β=γ=90°.

[0070] The TbFeSi of the present embodiment is in the magnetic field strength μ 0 The thermomagnetic (M-T) c...

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Abstract

The invention provides a rare earth-iron-silicon material for magnetic refrigeration, and a preparation method and application thereof. The material is a compound of the following general formula: RFeSi, wherein R is any one element of Gd, Tb, Dy, Ho and Er, or is the combination of Er element and any one element of Gd, Tb, Dy and Ho. The magnetic refrigeration material has a CeFeSi-type square crystal structure. The rare earth-iron-silicon material provided by the invention, especially ErFeSi and (Gd0.8 Er0.2) FeSi presenting relatively large magnetic entropy change near their respective phase transition temperatures and wide working temperature areas, has large magnetic refrigeration capacity and good thermal and magnetic reversibility, and is a very ideal medium and low temperature zone magnetic refrigeration material.

Description

technical field [0001] The invention relates to magnetic materials, in particular to a rare earth-iron-silicon material used for magnetic refrigeration and its preparation method and application. Background technique [0002] Magnetic refrigeration refers to a new type of green and environmentally friendly refrigeration technology that uses magnetic materials as refrigerants. When the arrangement is ordered, the magnetic material will release heat during isothermal magnetization, and the magnetic entropy will decrease at the same time; and when the magnetic field is removed, the atomic magnetic moments will return to the previous random state, and the magnetic material will absorb heat while the magnetic entropy will increase. Compared with the traditional gas compression refrigeration technology, magnetic refrigeration uses magnetic materials as the refrigerant, which has significant advantages such as high efficiency, energy saving, environmental protection, and stable ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/14C22C1/02C22F1/02H01F1/053
Inventor 张虎沈保根吴剑峰沈俊
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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