RE4TCd magnetic refrigeration material and preparation method thereof

A technology of magnetic refrigeration materials and raw materials, applied in the direction of magnetic materials, inductor/transformer/magnet manufacturing, inorganic material magnetism, etc., can solve the problems of commercial application limitations, magnetic entropy reduction, etc., and achieve reduced volatilization and large magnetic entropy change Effect

Active Publication Date: 2022-05-31
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, magnetic refrigeration materials in the low temperature region mainly include some paramagnetic metal salts and rare earth intermetallic compounds, but their commercial application is limited due to their relatively small magnetic entropy change

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1Dy4

[0022] Example 1Dy 4 Preparation of CuCd material

[0023] S1. Evenly mix the rare earth metal Dy and the transition metal elemental Cu at a molar ratio of 4.02:1 to form a raw material. Under an argon atmosphere, use a resistance wire heating method to heat until the raw material is completely melted and then cooled to obtain an alloy ingot. After turning over Melt again and cool down, repeat 3 times to get a uniform Dy 4 Cu alloy ingot;

[0024] S2, the Dy prepared in step S1 4 After the Cu alloy ingot is broken into 100 micron particles, it is weighed with Cd powder with a particle size of 60 microns in a molar ratio of 1:1.04, and mixed uniformly to obtain a mixed powder;

[0025] S3. Put the mixed powder obtained in step S2 into a sealed mold under a pressure of 60 MPa, heat to 300° C. for 10 hours, and cool to room temperature to obtain a dense alloy block;

[0026] S4. After removing the surface oxide layer from the alloy block prepared in step S3, heat it to 500° C...

Embodiment 2

[0028] Example 2Tm 4 Preparation of NiCd material

[0029] S1. Mix the rare earth metal Tm and the transition metal elemental Ni uniformly in a molar ratio of 4.03:1 to form a raw material. Under an argon atmosphere, use a resistance wire heating method to heat until the raw material is completely melted and then cooled to obtain an alloy ingot. After turning over Melt again and cool down, repeat 5 times to get a uniform Tm 4 Ni alloy ingot;

[0030] S2, the Tm prepared in step S1 4 After the Ni alloy ingot is broken into 150 micron particles, it is weighed with Cd powder with a particle size of 80 microns in a molar ratio of 1:1.05, and mixed uniformly to obtain a mixed powder;

[0031] S3. Put the mixed powder obtained in step S2 into a sealed mold under a pressure of 100 MPa, heat to 330° C. for 24 hours, and cool to room temperature to obtain a dense alloy block;

[0032] S4. After removing the oxide layer on the surface of the alloy block prepared in step S3, heat it ...

Embodiment 3

[0034] Example 3Ho 3 T m 1 Preparation of NiCd material

[0035] S1. Uniformly mix the rare earth metals Ho and Tm with the transition metal single substance Ni in a molar ratio of 3.02:1.02:1 to form raw materials. Under an argon atmosphere, use resistance wire heating to heat until the raw materials are completely melted and then cooled to obtain an alloy. Ingot, flipped and melted again and then cooled, repeated 5 times to obtain a uniform Ho 3 T m 1 Ni alloy ingot;

[0036] S2, the Ho prepared in step S1 3 T m 1 After the Ni alloy ingot is broken into 80 micron particles, it is weighed with the Cd powder having a particle size of 80 microns at a molar ratio of 1:1.06, and mixed uniformly to obtain a mixed powder;

[0037] S3. Put the mixed powder obtained in step S2 into a sealed mold under a pressure of 120 MPa, heat to 320° C. for 24 hours, and cool to room temperature to obtain a dense alloy block;

[0038] S4. After removing the oxide layer on the surface of the...

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PUM

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Abstract

The invention discloses an RE4TCd magnetic refrigeration material. RE is one or a mixture of two of rare earth elements Dy, Ho and Tm, and T is one or a mixture of two of transition metal elements Ni and Cu. The invention also discloses a preparation method of the RE4TCd magnetic refrigeration material, which comprises the following steps: mixing and melting the rare earth metal and the transition metal into an RE4T alloy ingot, crushing the RE4T alloy ingot, mixing the crushed RE4T alloy ingot with Cd powder, sintering in a sealed mold at high pressure and low temperature, and carrying out heat treatment to obtain the RE4TCd material. According to the RE4TCd magnetic refrigeration material and the preparation method thereof, the magnetic entropy change value of the RE4TCd magnetic refrigeration material is 16.4-25.8 J/kg K under the magnetic field change of 0-5, the RE4TCd magnetic refrigeration material has large magnetic entropy change, and the application range of the low-temperature magnetic refrigeration material is widened.

Description

technical field [0001] The invention relates to the technical field of magnetic refrigeration materials, in particular to a RE 4 TCd magnetic refrigeration material and its preparation method. Background technique [0002] The magnetic refrigeration material is a non-polluting refrigerant material that realizes refrigeration based on the magnetocaloric effect (magnetocaloric effect, also known as the magnetic card effect or magnetic entropy effect) of the material. The magnetocaloric effect is one of the intrinsic properties of magnetic materials, and its size depends on the intrinsic physical properties of magnetic materials. Magnetic refrigeration is the use of an external magnetic field to make the magnetic moment of the magnetic working medium change in an orderly and disorderly manner (phase transition), causing the magnet to absorb heat and release heat to perform a refrigeration cycle. Magnetic refrigeration is considered a "green" refrigeration method that does not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C28/00C22C1/04C22C1/02C22F1/16B22F9/04B22F3/14B22F1/052H01F1/01H01F41/02
CPCC22C28/00C22C1/02C22F1/16B22F9/04B22F3/14H01F1/015H01F41/0253H01F41/0266C22C2202/02C22C1/047Y02B30/00
Inventor 张义坤王昕李领伟
Owner HANGZHOU DIANZI UNIV
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