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Room temperature magnetic refrigeration working substance material and preparation thereof

A magnetic refrigeration and working fluid technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of high cost and low magnetocaloric effect, and achieve improved magnetic moment density and magnetic domain density, high magnetocaloric effect, and improved The effect of work efficiency

Active Publication Date: 2010-12-15
江苏晨朗电子集团有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] At present, the development of magnetic refrigeration technology is limited because the magnetocaloric effect of its core material magnetic refrigeration refrigerant is still relatively low, and the cost of many materials with better performance, such as GdSiGe series refrigerant materials, is relatively high; therefore, there is an urgent need for low-cost development. , and a new type of magnetic refrigerant material with high magnetic and thermal properties

Method used

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  • Room temperature magnetic refrigeration working substance material and preparation thereof
  • Room temperature magnetic refrigeration working substance material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mn in this example 2.7 Fe 2.3 sn 3 The alloy formula is subjected to magnetic field forming and magnetic field sintering, and the process and steps are as follows:

[0026] (1) Firstly, the processed high-purity raw material Mn, Fe, Sn powder is replaced with Mn 2.7 Fe 2.3 sn 3 Carry out stoichiometric formula to obtain mixed powder, and ball mill the mixed powder with a ball-to-material ratio of 10:1 (mass ratio), add acetone to the ball mill tank to protect and disperse the particles, and pass high-purity argon gas into the protective atmosphere;

[0027] (2) Perform ball milling in a high-energy ball mill for 4 hours at a speed of 200 rpm. Take out the acetone and powder mixture and dry it under argon protection atmosphere to obtain fine Mn, Fe, Sn uniformly mixed powder;

[0028] (3) the mixed powder of above-mentioned preparation is contained in the mold cavity with high magnetic permeability material (referring to figure 1 ), magnetization is carried out be...

Embodiment 2

[0031] In this example, Mn 3 Fe 2 sn 3 The alloy formula is subjected to magnetic field forming and magnetic field sintering, and the process and steps are as follows:

[0032] (1) Firstly, the processed high-purity raw material Mn, Fe, Sn powder is replaced with Mn 3 Fe 2 sn 3 Carry out stoichiometric formula, obtain mixed powder, carry out ball milling to this mixed powder, ball material ratio is 10: 1 (mass ratio), acetone is added in the ball mill jar to be used for protecting and dispersing particle, and pass into high-purity argon protective atmosphere;

[0033] (2) Perform ball milling in a high-energy ball mill for 4 hours at a speed of 200 rpm. Take out the acetone and powder mixture and dry it under argon protection atmosphere to obtain fine Mn, Fe, Sn uniformly mixed powder;

[0034] (3) the mixed powder of above-mentioned preparation is contained in the mold cavity with high magnetic permeability material (referring to figure 1 ), magnetization is carried ou...

Embodiment 3

[0037] In this example, Mn 3.6 Fe 1.4 sn 3 The alloy formula is subjected to magnetic field forming and magnetic field sintering, and the process and steps are as follows:

[0038] (1) Firstly, the processed high-purity raw material Mn, Fe, Sn powder is replaced with Mn 3.6 Fe 1.4 sn 3 Carry out stoichiometric formula to obtain mixed powder, and ball mill the mixed powder with a ball-to-material ratio of 10:1 (mass ratio), add acetone to the ball mill tank to protect and disperse the particles, and pass high-purity argon gas into the protective atmosphere;

[0039] (2) Perform ball milling in a high-energy ball mill for 4 hours at a speed of 200 rpm. Take out the acetone and powder mixture and dry it under argon protection atmosphere to obtain fine Mn, Fe, Sn uniformly mixed powder;

[0040] (3) the mixed powder of above-mentioned preparation is contained in the mold cavity with high magnetic permeability material (referring to figure 1 ), magnetization is carried out b...

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Abstract

The invention relates to a room temperature magnetic refrigerating working material and a preparation method thereof. The chemical composition formula of the material is Mn<5-x>FexSn3( x is equal to 1.0 to 3.6); the main steps of the preparation method are as follows: materials are prepared and mixed according to chemical measurement and ball milling is carried out on the materials for 2 to 7 hours in a high-energy ball mill under the protection of acetone and argon; then the materials are dried and charged with magnetism under a magnetic filed of 0.5 to 2.0 T in a die cavity provided with a material which has a high magnetism conductive rate; then the powder is pressed into a blank and is sintered for 0.5 to 3 hours in vacuum under a pulse magnetic filed of 2 to 5.0 T and a temperature of 600 to 900 DEG C, thus manufacturing the room temperature magnetic refrigerating working material. The room temperature magnetic refrigerating working material has higher magnetic moment density andmagnetic domain density as well as larger magnetocaloric effect.

Description

technical field [0001] The invention relates to a room-temperature magnetic refrigeration working medium material and a preparation method thereof, and belongs to the technical field of preparation of special alloy materials and magnetic treatment. Background technique [0002] Compared with traditional refrigeration technology, high-tech green magnetic refrigeration technology has the advantages of high efficiency, low power consumption, low noise, small size, and no pollution. It is expected to replace traditional refrigeration technology, so it has become an international frontier topic that people are very concerned about. [0003] The magnetic refrigerant operates by using the characteristic that the magnetic entropy change of the substance increases significantly near the Curie temperature Tc (Curie point). Its working principle is: when the ferromagnetic refrigerant is magnetized near the Curie temperature , under the action of an external field, the inner magnetic do...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C09K5/14B22F3/16
Inventor 张鹏侯雪玲胡星浩倪建森徐晖周邦新
Owner 江苏晨朗电子集团有限公司
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