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A lanthanum-iron-silicon/gadolinium composite magnetic refrigeration material and its preparation process

A magnetic refrigeration material and magnetic refrigeration technology, applied in the direction of magnetic material, inorganic material magnetism, process efficiency improvement, etc., can solve the problem of reducing the effective content of magnetic refrigeration working medium material, affecting refrigeration efficiency, and binder not having magnetic refrigeration characteristics and other problems, to achieve the effects of enhanced mechanical properties, high economic value, and good magnetocaloric effect.

Active Publication Date: 2020-03-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these binders themselves do not have magnetic refrigeration properties, so their introduction will inevitably reduce the effective content of magnetic refrigeration materials, thereby affecting their refrigeration efficiency.

Method used

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  • A lanthanum-iron-silicon/gadolinium composite magnetic refrigeration material and its preparation process
  • A lanthanum-iron-silicon/gadolinium composite magnetic refrigeration material and its preparation process
  • A lanthanum-iron-silicon/gadolinium composite magnetic refrigeration material and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: Implement a new type of lanthanum-iron-silicon / gadolinium composite magnetic refrigeration material and its preparation process according to the following specific steps:

[0052] Step 1: LaFe, Fe, Co, and Si are mixed in proportion to obtain LaFe 10.58 co 0.82 Si 1.6 Ingot;

[0053] Step 2, the LaFe obtained in step 1 10.58 co 0.82 Si 1.6 The ingot is annealed in an inert atmosphere to obtain a uniform NaZn 13 structural organization;

[0054] Step 3, preparing pure Gd into powder particles by quick quenching and ball milling;

[0055] Step 4, sieving the Gd powder particles in the third step to 75-125 μm;

[0056] Step 5, crushing and sieving the alloy obtained in Step 2 to 125-150 μm;

[0057] Step 6, the LaFe obtained in step 5 10.58 co 0.82 Si 1.6 Particles are mixed uniformly with the Gd particles obtained in step 5 in a ratio of 9:1;

[0058] Step 7: Put the mixed powder obtained in Step 6 into an alloy mold, and prepare a block by spar...

Embodiment 2

[0063] Embodiment 2: Implement a new type of lanthanum-iron-silicon / gadolinium composite magnetic refrigeration material and its preparation process according to the following specific steps:

[0064] Step 1: La, Pr, Fe-C, Co, and Si are mixed in proportion to prepare La 0.5 PR 0.5 Fe 10.7 co 0.8 Si 1.5 C 0.2 Ingot;

[0065] Step 2, the La obtained in Step 1 0.5 PR 0.5 Fe 10.7 co 0.8 Si 1.5 C 0.2 The ingot is annealed in an inert atmosphere to obtain a uniform NaZn 13 structural organization;

[0066] Step 3, the pure Gd is prepared into powder particles by gas atomization;

[0067] Step 4, sieving the Gd powder particles in the third step to 37-75 μm;

[0068] Step 5, crushing and sieving the alloy obtained in Step 2 to 180-425 μm;

[0069] Step 6, La obtained in step 5 0.5 PR 0.5 Fe 10.7 co 0.8 Si 1.5 C 0.2 Particles are mixed uniformly with the Gd particles obtained in step 5 in a ratio of 7:3, 5:5, and 1:9;

[0070] In step seven, the mixed powder obt...

Embodiment 3

[0075] Embodiment 3: Implement a new type of lanthanum-iron-silicon / gadolinium composite magnetic refrigeration material and its preparation process according to the following specific steps:

[0076] Step 1: La, Ce, Fe, Mn, Si are mixed in proportion to prepare La 0.8 Ce 0.2 Fe 12.4 mn 0.3 Si 1.3 Ingot;

[0077] Step 2, the La obtained in Step 1 0.8 Ce 0.2 Fe 12.4 mn 0.3 Si 1.3 The ingot is annealed in an inert atmosphere to obtain a uniform NaZn 13 Structural organization, it is hydrogenated to obtain La 0.8 Ce 0.2 Fe 12.4 mn 0.3 Si 1.3 H particles;

[0078] Step 3, the pure Gd is prepared into powder particles through the method of ventilating and atomizing;

[0079] Step 4, sieving the Gd powder particles in the third step to 125-150 μm;

[0080] Step five, the La obtained in step two 0.8 Ce 0.2 Fe 12.4 mn 0.3 Si 1.3 H particles are sieved to 150-180 μm;

[0081] Step 6, La obtained in step 5 0.8 Ce 0.2 Fe 12.4 mn 0.3 Si 1.3 Mix the H particles ...

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Abstract

The invention discloses a lanthanum-iron-silicon / gadolinium composite magnetic refrigeration material and a preparation technology thereof and belongs to the field of magnetic refrigeration materialsin magnetic functional materials. A La-Fe-Si / Gd composite magnetic refrigeration material with high strength and high performance is obtained by adopting metal Gd particles as a second magnetic refrigeration material of playing a bonding role and La-Fe-Si series alloy through hot pressing sintering. The invention further discloses a preparation method and application of the La-Fe-Si / Gd composite magnetic refrigeration material. The La-Fe-Si series alloy and Gd are magnetic refrigeration materials with excellent performance, so that the mechanical properties are complementary. Through additionof Gd elemental particles, the mechanical property of the La-Fe-Si series alloy is greatly strengthened, and furthermore, the damage to the magnetic refrigeration performance caused by use of other binders is avoided. The obtained magnet has good magnetic refrigeration performance and relatively high strength, is simple in equipment, simple in operation and relatively low in cost in an implementation process, is high in economic value and has important application significance in the field of magnetic refrigeration, and mass production is easy to implement.

Description

technical field [0001] The invention discloses a lanthanum-iron-silicon / gadolinium (La-Fe-Si / Gd) composite magnetic refrigeration material and a preparation process thereof, belonging to the field of magnetic refrigeration materials in magnetic functional materials. Background technique [0002] Refrigeration technology has extensive and important applications in today's society. However, the refrigerant in the gas compression refrigeration technology commonly used at present can cause the greenhouse effect, destroy the ozone layer, and its working efficiency is low. Exploring green, environmentally friendly, energy-saving and efficient new refrigeration technologies and developing corresponding high-performance refrigerant materials are urgent problems in this field, and are also current research hotspots at home and abroad. [0003] Magnetic refrigeration technology has the characteristics of environmental protection, high efficiency, energy saving, stability and reliabil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/01B22F1/00B22F3/105
CPCB22F1/0003B22F3/105B22F2998/10H01F1/015Y02P10/25
Inventor 张红国潘文吉岳明张东涛刘卫强路清梅
Owner BEIJING UNIV OF TECH