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Single-phase rhodium-based alloy magnetic refrigeration material as well as preparation method and application thereof

A technology of magnetic refrigeration materials and base alloys, which is applied in the fields of magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems that cannot meet the practical requirements of refrigeration equipment, achieve excellent magnetic refrigeration performance and broad application prospects Effect

Active Publication Date: 2020-10-16
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Single-phase rhodium-based alloy magnetic refrigeration material as well as preparation method and application thereof
  • Single-phase rhodium-based alloy magnetic refrigeration material as well as preparation method and application thereof
  • Single-phase rhodium-based alloy magnetic refrigeration material as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0050] Step 1) Ho 3 Rh 2 Melting of alloy magnetic refrigeration alloy ingots, according to the chemical formula Ho 3 Rh 2 After weighing Ho and Rh raw materials, among them, the amount of Ho added should be added 0.5wt.% on the basis of the theoretical content as compensation, put the prepared raw materials into the electric arc furnace and use two-stage vacuuming with mechanical pump and diffusion pump , when the vacuum reaches 2×10 -3 Pa, after cleaning twice with high-purity argon gas with a purity of 99.99%, repeated flipping and melting three times under the protection of high-purity argon gas at 1 atmospheric pressure, and cooling to room temperature with the furnace after melting to obtain a rhodium-based alloy magnet with uniform composition. refrigeration alloy ingot;

[0051] Step 2) Ho 3 Rh 2 The annealing treatment of a...

Embodiment 2

[0066] a kind of Er 3 Rh 2 The preparation method of the alloy magnetic refrigeration material, the steps not specified in particular are the same as the preparation method described in Example 1, the difference is: the step 1) smelting of the alloy magnetic refrigeration material, specifically according to Er 3 Rh 2 The amount of substance of the chemical formula is 3:2 Weigh Er with 99.99% purity and Rh with 99.999% purity.

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

[0068] In order to further prove the phase composition and single-phase property of the obtained...

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Abstract

The invention discloses a single-phase rhodium-based alloy magnetic refrigeration material. The general formula of a compound is R3Rh2, R is any one of rare earth elements Ho or Er, and the componentis a single phase; and the single phase is of a Y3Rh2 type crystal structure. The preparation method of the material comprises the following steps: (1) smelting a rhodium-based alloy magnetic refrigeration alloy ingot; and (2) annealing the rhodium-based magnetic refrigeration material. The material is applied as a magnetic refrigeration material, is a secondary phase change material and is free of heat stagnation; and the magnetic entropy change value ranges from 14 J kg <-1> K <-1> to 20 J kg <-1> K <-1> under the magnetic field of 0T to 5T, and the refrigeration capacity reaches 380 J / kg to390 J / kg. The technical scheme has the advantages that the single-phase property is good; the material is a single secondary phase change material, only magnetic structure transformation occurs nearthe magnetic transformation temperature, and heat stagnation does not exist; the material is a very ideal low-temperature area magnetic refrigeration material; and the process is simple and 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 its preparation method and application. 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 generally used to realize refrigeration. Compared with magnetic refrigeration, it has the advantages of greenness, energy saving, and easy miniaturization. It can reduce 30%-40% of the power consumption of traditional refrigerators. It is an ideal energy-saving and environmentally friendly refrigeration. technology. Magnetic refrigeration refers to the physical phenomenon of exothermic or endothermic heat generated when the magnetic...

Claims

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Application Information

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Patent Type & Authority Applications(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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