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A kind of la-fe-si based magnetic refrigeration composite material based on hot pressing reaction sintering and preparation method thereof

A magnetic refrigeration material, la-fe-si technology, applied in magnetic materials, inductor/transformer/magnet manufacturing, inorganic material magnetism, etc., can solve the problems of difficult processing, low Curie temperature, etc. Curie temperature, high hardness

Active Publication Date: 2021-09-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that the large magnetic entropy change La-Fe-Si-based magnetic refrigeration material has a low Curie temperature and the large volume effect accompanied by the magnetic first-order phase transition makes it difficult to process, it proposes a one-step high-temperature hot-pressing reaction sintering molding to obtain High Density and High Thermal Conductivity, Simultaneous Realization of High-Temperature Atom Reactive Diffusion to Improve the Magnetic-Caloric Performance of La-Fe-Si-Based Magnetic Refrigeration Materials

Method used

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  • A kind of la-fe-si based magnetic refrigeration composite material based on hot pressing reaction sintering and preparation method thereof
  • A kind of la-fe-si based magnetic refrigeration composite material based on hot pressing reaction sintering and preparation method thereof
  • A kind of la-fe-si based magnetic refrigeration composite material based on hot pressing reaction sintering and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A kind of La-Fe-Si base magnetic refrigeration composite material, its preparation method is as follows:

[0033] Step 1: Press Ce 2 co 7 Nominal composition of the alloy, the raw materials are pure Ce (≥99.5wt.%) and Co (≥99.95wt.%) blocks, of which the Ce balance is 5wt.% to supplement the volatilization mass loss during the smelting process. times to ensure the uniformity of the ingot. The resulting button-shaped ingot is mechanically ground and sieved to obtain Ce with a particle size of less than 30 μm. 2 co 7 Alloy powder particles.

[0034] Step 2: Calculate with the total mass as 6g, where Ce 2 co 7 The mass ratio of alloy powder particles is 0g, and the particle size range is 46-100μm LaFe 11.6 Si 1.4 The mass ratio of compound powder particles is 6g as 100%; where LaFe 11.6 Si 1.4 The compound is NaZn 13 Type structure 1:13 main phase (~85wt.%) and a small amount of α-Fe (~15wt.%) continuous casting thin strip;

[0035] Step 3: Mix the weighed allo...

Embodiment 2

[0046] A kind of La-Fe-Si base magnetic refrigeration composite material, its preparation method is as follows:

[0047] Step 1: Press Ce 2 co 7 Nominal composition of the alloy, the raw materials are pure Ce (≥99.5wt.%) and Co (≥99.95wt.%) blocks, of which the Ce balance is 5wt.% to supplement the volatilization mass loss during the smelting process. times to ensure the uniformity of the ingot. The resulting button-shaped ingot is mechanically ground and sieved to obtain Ce with a particle size of less than 30 μm. 2 co 7 Alloy powder particles.

[0048] Step 2: Calculate with the total mass as 6g, where Ce 2 co 7The mass ratio of alloy powder particles is 0.3g, and the particle size range is 46-100μm LaFe 11.6 Si 1.4 The mass ratio of the compound powder particles is 95% and is 5.7g; where LaFe 11.6 Si 1.4 The compound is NaZn 13 Type structure 1:13 main phase (~85wt.%) and a small amount of α-Fe (~15wt.%) continuous casting thin strip;

[0049] Step 3: Mix the we...

Embodiment 3

[0058] A kind of La-Fe-Si base room temperature magnetic refrigeration composite material, its preparation method is as follows:

[0059] Step 1: Press Ce 2 co 7 Nominal composition of the alloy, the raw materials are pure Ce (≥99.5wt.%) and Co (≥99.95wt.%) blocks, of which the Ce balance is 5wt.% to supplement the volatilization mass loss during the smelting process. times to ensure the uniformity of the ingot. The resulting button-shaped ingot is mechanically ground and sieved to obtain Ce with a particle size of less than 30 μm. 2 co 7 Alloy powder particles.

[0060] Step 2: Calculate with the total mass as 6g, where Ce 2 co 7 The mass ratio of alloy powder particles is 0.6g, and the particle size range is 46-100μm LaFe 11.6 Si 1.4 The mass ratio of the compound powder particles is 90% and is 5.4g; where LaFe 11.6 Si 1.4 The compound is NaZn 13 Type structure 1:13 main phase (~85wt.%) and a small amount of α-Fe (~15wt.%) continuous casting thin strip;

[0061] ...

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Abstract

The invention discloses a La-Fe-Si-based magnetic refrigeration composite material based on hot-pressing reaction sintering and a preparation method thereof, which consists of a main phase La-Fe-Si-based magnetic refrigeration material and a binder RE-Co-based alloy powder Uniformly mixed, formed by high-temperature hot-pressing reaction sintering method to prepare a magnetic refrigeration composite material; the temperature of the high-temperature hot-pressing sintering molding is 900-1200 ° C, and the pressure is 10-100 MPa; the La-Fe-Si-based magnetic refrigeration The particle size of the material is ≤300 μm, and the particle size of the RE‑Co-based alloy powder is ≤100 μm. The present invention adopts high-temperature hot-pressing reaction sintering, and the Ce-Co alloy powder particles diffuse into the main phase at the same time of high-temperature hot-pressing reaction sintering, forming main phase particles of a new composition between the original main phase particles, so that the main phase particles are mutually The connection is integrated, which improves the density of the composite material and the mechanical properties of the composite material.

Description

technical field [0001] The invention relates to a La-Fe-Si based magnetic refrigeration composite material, in particular to a block composite magnetic refrigeration material with high mechanical properties and good magnetocaloric properties prepared by a molding method integrating high temperature hot pressing and high temperature diffusion in one step and its preparation method. Background technique [0002] In the process of social development and industrialization, refrigeration technology plays an irreplaceable role. However, the gas compression refrigeration technology commonly used at present has the disadvantages of low refrigeration efficiency (generally only 5-10% of the Carnot cycle), high energy consumption, and aggravated greenhouse effect. 60% of the Nordic cycle), no environmental pollution, reliable operation and a series of advantages, it is considered to be the most promising green refrigeration technology to replace gas compression refrigeration. Among m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/01H01F41/02B22F1/00B22F3/14
CPCH01F1/017H01F41/0266H01F41/0293B22F3/14B22F1/105
Inventor 钟喜春董旭涛刘仲武余红雅张辉邱万奇
Owner SOUTH CHINA UNIV OF TECH
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