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A kind of single-phase rhodium-based alloy magnetic refrigeration material and its preparation method and application

A technology of magnetic refrigeration materials and base alloys, applied in the direction of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems that cannot meet the practical requirements of refrigeration equipment, and achieve the advantages of magnetic refrigeration efficiency and large magnetic refrigeration ability, the effect of excellent magnetic refrigeration performance

Active Publication Date: 2022-03-25
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the prior art has the following technical problems: ErCo 2 and Nd 7 PD 3 Both are magnetic refrigeration materials with a first-order magnetic phase transition, that is, while obtaining a large magnetocaloric effect, it is inevitably accompanied by the generation of magnetic hysteresis and thermal hysteresis
However, the magnetic entropy change value of the secondary phase change magnetic refrigeration material is often smaller than that of the primary phase change material
[0008] For example, prior art document 3 (Y.S.Du, C.R.Li, G.Cheng, X.F.Wu, J.J.Huo, J.Q.Wei, J.Wang. Investigation on the Magnetocaloric Effect of the Pr 7 PD 3 Compound[J].Journal of Superconductivity and Novel Magnetism, 2018,31:2573–2577.) reported that the magnetic refrigeration material Pr 7 PD 3 , although there is no hysteresis thermal hysteresis, the magnetic entropy change is only 5.5J kg at 5T magnetic field -1 K -1 , unable to meet the practical requirements of refrigeration equipment

Method used

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  • A kind of single-phase rhodium-based alloy magnetic refrigeration material and its preparation method and application
  • A kind of single-phase rhodium-based alloy magnetic refrigeration material and its preparation method and application
  • A kind of single-phase rhodium-based alloy magnetic refrigeration material and its preparation method and application

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Embodiment 1

[0049] A single-phase Ho 3 Rh 2 The preparation method of alloy magnetic refrigeration material, the concrete steps are as follows:

[0050] Step 1) Ho 3 Rh 2 Melting of alloy magnetic refrigeration alloy ingots, according to chemical formula Ho 3 Rh 2 After weighing the Ho and Rh raw materials, the addition amount of Ho should be an additional 0.5wt.% on the basis of the theoretical content as a compensation loss, put the prepared raw materials into the electric arc furnace, and use a mechanical pump and a diffusion pump to vacuumize in two stages , when the vacuum degree reaches 2×10 -3 At Pa, after cleaning with high-purity argon with a purity of 99.99% for 2 times, under the protection of high-purity argon at 1 atmosphere, the smelting is repeated 3 times. Refrigerated alloy ingots;

[0051] Step 2) Ho 3 Rh 2 The annealing treatment of the alloy magnetic refrigeration material, the Ho obtained in step 1) 3 Rh 2 Alloy magnetic refrigeration material The alloy ing...

Embodiment 2

[0066] an Er 3 Rh 2 The preparation method of the alloy magnetic refrigeration material, the unspecified steps are the same as the preparation method described in Example 1, the difference is: the step 1) smelting the alloy magnetic refrigeration material, specifically according to Er 3 Rh 2 The amounts of substances of the chemical formula are 3:2 Weigh 99.99% pure Er and 99.999% pure Rh.

[0067] In order to carry out phase identification and structural characterization of the obtained product, Er was measured by X-ray diffractometer. 3 Rh 2 room temperature X-ray diffraction lines. like Figure 7 As shown, the refined results show that the experimental data are in good agreement with the calculated values, Er 3 Rh 2 for Y 3 Rh 2 A single-phase compound with a tetragonal crystal structure, and its space group is I4 / mcm.

[0068] In order to further prove the phase composition and single phase of the obtained product, scanning electron microscopy was carried out, su...

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Abstract

The invention discloses a single-phase rhodium-based alloy magnetic refrigeration material, the general formula of which is R 3 Rh 2 , wherein R is any one of the rare earth elements Ho or Er, and its composition is a single phase; the single phase is Y 3 Rh 2 type of crystal structure. The preparation method comprises the following steps: 1) melting of rhodium-based alloy magnetic refrigeration alloy ingot; 2) annealing treatment of rhodium-based magnetic refrigeration material. As a magnetic refrigeration material, it is a two-stage phase change material without thermal hysteresis; the magnetic entropy change value is in the range of 14-20 J kg under a 0-5 T magnetic field ‑1 K ‑1 , the refrigeration capacity is up to 380‑390 J / kg. The invention has the following advantages: good single-phase property; it is a single two-stage phase change material, and only magnetic structure transition occurs near the magnetic transition temperature without thermal hysteresis; it is a very ideal magnetic refrigeration material in low temperature region; and the process is simple, Suitable for industrial production.

Description

technical field [0001] The invention relates to an alloy magnetic refrigeration material in the field of magnetic refrigeration, in particular to a single-phase rhodium-based alloy magnetic refrigeration material and a preparation method and application thereof. Background technique [0002] In recent years, global energy demand, environmental pollution and global warming are pressing issues, and it is inevitable to develop innovative green technologies, especially in the field of refrigeration. At present, gas compression refrigeration technology is widely used to achieve refrigeration. Compared with magnetic refrigeration, it has the advantages of greenness, energy saving, and easy miniaturization. It can reduce power consumption by 30%-40% of traditional refrigerators. It is an ideal energy-saving and environmentally friendly refrigeration. technology. Magnetic refrigeration refers to a physical phenomenon in which magnetic materials are used as refrigerants to generate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C5/04C22C1/02C22F1/14H01F1/053H01F41/02
CPCC22C5/04C22C1/02C22F1/14H01F1/053H01F41/0293H01F41/0253
Inventor 杜玉松王永吉李林武小飞成钢王江赵景泰饶光辉
Owner GUILIN UNIV OF ELECTRONIC TECH
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