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LaFeSi-base magnetic refrigeration composite block body material based on grain boundary diffusion technique and preparation method of composite block body material

A technology of magnetic refrigeration material and grain boundary diffusion, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve problems such as restricting commercial applications, and achieve the mitigation of magnetic volume effect, thermal hysteresis, and magnetic hysteresis. Effect

Active Publication Date: 2018-07-03
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These unfavorable factors still limit the NaZn 13 Commercial application of LaFeSi-based magnetic refrigeration materials with type structure

Method used

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  • LaFeSi-base magnetic refrigeration composite block body material based on grain boundary diffusion technique and preparation method of composite block body material
  • LaFeSi-base magnetic refrigeration composite block body material based on grain boundary diffusion technique and preparation method of composite block body material
  • LaFeSi-base magnetic refrigeration composite block body material based on grain boundary diffusion technique and preparation method of composite block body material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of LaFeSi base magnetic refrigeration composite material, its preparation method is as follows:

[0039] Step 1: Press LaFe 11.6 Si 1.4 Alloy and La 70 co 30 Nominal composition of the alloy, raw materials are pure La (≥99.5wt.%), Fe (≥99.95wt.%), Co (≥99.95wt.%), Si (≥99.9999%) blocks, of which the La balance is 3wt .% to supplement the volatile mass loss during the smelting process, and the smelting was turned over 5 times to ensure the uniformity of the ingot. LaFe 11.6 Si 1.4 Alloy and La 70 co 30 The speeds of the alloy strips are 30m / s and 15m / s respectively. The resulting LaFe 11.6 Si 1.4 The alloy strip is sealed and annealed at 1100°C for 24 hours to obtain a 1:13 phase with a content of about 93.5wt.%, and the remainder is α-Fe. The obtained strips are mechanically ground and sieved to obtain LaFe with a particle size of 76-105um and less than 45um. 11.6 Si 1.4 Alloy particles and La with particle size less than 30um 70 co 30 alloy partic...

Embodiment 2

[0054] A kind of LaFeSi base magnetic refrigeration composite material, its preparation method is as follows:

[0055] Step 1: Press LaFe 11.6 Si 1.4 Alloy and La 70 co 30 Nominal composition of the alloy, the raw materials are pure La (≥99.5wt.%), Fe, Co (≥99.95wt.%), Si (≥99.9999%) blocks, and the La balance is 3wt.% to supplement the smelting process The loss of volatile mass, smelting and turning over 5 times to ensure the uniformity of the ingot. LaFe 11.6 Si 1.4 Alloy and La 70 co 30 The speeds of the alloy strips are 30m / s and 15m / s respectively. The resulting LaFe 11.6 Si 1.4 The alloy strip is sealed and annealed at 1100°C for 24 hours to obtain a 1:13 phase with a content of about 93.5wt.%, and the remainder is α-Fe. The obtained strips are mechanically ground and sieved to obtain LaFe with a particle size of 76-105um and less than 45um. 11.6 Si 1.4 Alloy particles and La with particle size less than 30um 70 co 30 alloy particles.

[0056] Step 2: Bas...

Embodiment 3

[0066] A kind of LaFeSi base magnetic refrigeration composite material, its preparation method is as follows:

[0067] Step 1: Press LaFe 11.6 Si 1.4 Alloy and La 70 co 30 Nominal composition of the alloy, the raw materials are pure La (≥99.5wt.%), Fe, Co (≥99.95wt.%), Si (≥99.9999%) blocks, and the La balance is 3wt.% to supplement the smelting process The loss of volatile mass, smelting and turning over 5 times to ensure the uniformity of the ingot. LaFe 11.6 Si 1.4 Alloy and La 70 co 30 The speeds of the alloy strips are 30m / s and 15m / s respectively. The resulting LaFe 11.6 Si 1.4 The alloy strip is sealed and annealed at 1100°C for 24 hours to obtain a 1:13 phase with a content of about 93.5wt.%, and the remainder is α-Fe. The obtained strips are mechanically ground and sieved to obtain LaFe with a particle size of 76-105um and less than 45um. 11.6 Si 1.4 Alloy particles and La with particle size less than 30um 70 co 30 alloy particles.

[0068] Step 2: Bas...

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Abstract

The invention discloses a LaFeSi-base magnetic refrigeration composite block body material based on a grain boundary diffusion technique and a preparation method of the composite block body material.The preparation method comprises the steps of uniformly mixing LaFeSi magnetic refrigeration material particles with La-Co alloy particles, processing the mixture into a block body through vacuum thermal mold pressing, carrying out diffusion annealing thermal treatment, so as to obtain the composite block body material, wherein the LaFeSi magnetic refrigeration material particles are LaFe12-xSix materials, and x is more than or equal to 1.0 and less than or equal to 1.6. The preparation method has the advantages that the composite material consists of a thermomagnetic working medium and a binder, and the porosity of the material is reduced by virtue of the binder, so that the high-density and high-thermomagnetic property LaFeSi-base magnetic refrigeration composite material is obtained, and the problems that a LaFeSi-base magnetic refrigeration material is great in fragility, difficult to process and form and the like are well solved; the LaFeSi-base magnetic refrigeration material prepared through thermal pressing formation has a small amount of holes, so that the stress action caused due to a magnetic volume effect in a magnetic phase change process is relieved; and by carrying out subsequent treatment, Co elements in the binder enter a relieve main phase lattice through grain boundary diffusion, so that the Curie temperature of the material is adjusted and controlled.

Description

technical field [0001] The invention relates to a metal-based magnetic refrigeration composite material, in particular to a La-Fe-Si-based magnetic refrigeration composite material with high density and good magnetocaloric performance and a preparation method thereof. Background technique [0002] The traditional gas compression refrigeration technology that is widely used at present has a series of disadvantages such as low refrigeration efficiency, environmental pollution and high noise. In particular, the use of Freon, the refrigeration medium that traditional gas compression refrigeration relies on, is banned, which makes the traditional refrigeration industry face huge challenges. , it is imperative to develop a new refrigeration technology. [0003] Magnetic refrigeration technology is a new type of refrigeration technology that relies on the magnetocaloric effect of environmentally friendly magnetic solid working fluid materials to achieve refrigeration. Using this te...

Claims

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Application Information

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IPC IPC(8): H01F1/01H01F41/02
CPCH01F1/015H01F41/02
Inventor 钟喜春彭得然董旭涛刘仲武焦东玲邱万奇张辉
Owner SOUTH CHINA UNIV OF TECH
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