La-Fe-Si base room-temperature magnetic refrigeration composite material and preparing method thereof

A magnetic refrigeration material, la-fe-si technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve problems such as performance gaps, and achieve the effects of excellent mechanical properties, excellent mechanical properties, and good density

Active Publication Date: 2019-03-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the mechanical properties of composite materials in literature [3] have been improved to a certain extent, there is still a large gap with the ideal material properties that can be applied.

Method used

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  • La-Fe-Si base room-temperature magnetic refrigeration composite material and preparing method thereof
  • La-Fe-Si base room-temperature magnetic refrigeration composite material and preparing method thereof
  • La-Fe-Si base room-temperature magnetic refrigeration composite material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of La-Fe-Si base room temperature magnetic refrigeration composite material, its preparation method is as follows:

[0036] Step 1: Press LaFe 11.6 Si 1.4 Alloy and Ce 40 co 60 Nominal composition of the alloy, the raw materials are pure La (≥99.5wt.%), Ce (≥99.5wt.%), Fe (≥99.95wt.%), Co (≥99.95wt.%), Si (≥99.9999%) In the block, the balance of La and Ce is 3wt.% to supplement the volatile mass loss during the smelting process, and the smelting is turned over 5 times to ensure the uniformity of the ingot. LaFe 11.6 Si 1.4 Alloy and Ce 40 co 60 The speeds of the alloy strips are 1.5m / s and 15m / s respectively. The resulting LaFe 11.6 Si 1.4 The alloy strip is sealed and annealed at 1050°C for 24 hours to obtain NaZn with a content of about 84.7wt.%. 13 Type 1:13 phase, the remainder is α-Fe and a small amount of LaFeSi (1:1:1) phase. The obtained strip is mechanically ground and sieved to obtain LaFe with a particle size of 100-300 μm and less than 46 ...

Embodiment 2

[0052] A kind of La-Fe-Si base room temperature magnetic refrigeration composite material, its preparation method is as follows:

[0053] Step 1: Press LaFe 11.6 Si 1.4 Alloy and Ce 40 co 60 Nominal composition of the alloy, the raw materials are pure La (≥99.5wt.%), Ce (≥99.5wt.%), Fe (≥99.95wt.%), Co (≥99.95wt.%), Si (≥99.9999%) In the block, the balance of La and Ce is 3wt.% to supplement the volatile mass loss during the smelting process, and the smelting is turned over 5 times to ensure the uniformity of the ingot. LaFe 11.6 Si 1.4 Alloy and Ce 40 co 60 The speeds of the alloy strips are 1.5m / s and 15m / s respectively. The resulting LaFe 11.6 Si 1.4 The alloy strip is sealed and annealed at 1050°C for 24 hours to obtain NaZn with a content of about 84.7wt.%. 13 Type 1:13 phase, the remainder is α-Fe and a small amount of LaFeSi (1:1:1) phase. The obtained strip is mechanically ground and sieved to obtain LaFe with a particle size of 100-300 μm and less than 46 ...

Embodiment 3

[0065] A kind of La-Fe-Si base room temperature magnetic refrigeration composite material, its preparation method is as follows:

[0066] Step 1: Press LaFe 11.6 Si 1.4 Alloy and Ce 40 co 60 Nominal composition of the alloy, the raw materials are pure La (≥99.5wt.%), Ce (≥99.5wt.%), Fe (≥99.95wt.%), Co (≥99.95wt.%), Si (≥99.9999%) In the block, the balance of La and Ce is 3wt.% to supplement the volatile mass loss during the smelting process, and the smelting is turned over 5 times to ensure the uniformity of the ingot. LaFe 11.6 Si 1.4 Alloy and Ce 40 co 60 The speeds of the alloy strips are 1.5m / s and 15m / s respectively. The resulting LaFe 11.6 Si 1.4 The alloy strip is sealed and annealed at 1050°C for 24 hours to obtain NaZn with a content of about 84.7wt.%. 13 Type 1:13 phase, the remainder is α-Fe and a small amount of LaFeSi (1:1:1) phase. The obtained strip is mechanically ground and sieved to obtain LaFe with a particle size of 100-300 μm and less than 46 ...

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Abstract

The invention discloses a La-Fe-Si base room-temperature magnetic refrigeration composite material and a preparing method thereof. A La-Fe-Si base magnetic refrigeration material and Ce-Co alloy powder are evenly mixed, low-temperature hot press sintering and subsequent high-temperature diffusion heat treatment are conducted, finally, rapid quenching is conducted to the room temperature, and a cylindrical composite magnetic refrigeration material is prepared; and the La-Fe-Si base magnetic refrigeration material is formed by mixing particles with the granularity being 100-300 microns and the granularity smaller than 46 microns. The composite material is composed of a magnetic heat working medium and a bonding agent. On one hand, the material porosity is reduced through the bonding agent, so that good density and excellent mechanical performance are achieved; and on the other hand, bonding agent atoms enter main phase particles through heat diffusion, a large-platform-shaped magnetic entropy change and high-refrigerating-capacity La-Fe-Si base magnetic refrigeration composite material can be better obtained. The problem that the La-Fe-Si is large in brittleness and is large in heat / magnetic lagging accompanying the first-level phase change, and the La-Fe-Si is difficultly used in the magnetic refrigeration cycle is solved.

Description

technical field [0001] The invention relates to a La-Fe-Si-based magnetic refrigeration composite material, in particular to a magnetic entropy change platform in the room temperature region, a large refrigeration capacity, and a high compressive resistance prepared by the molding method of low-temperature hot-press sintering and subsequent high-temperature diffusion heat treatment. A high-strength bulk composite magnetic refrigeration material and a preparation method thereof. Background technique [0002] Compared with the gas compression refrigeration technology commonly used at present, magnetic refrigeration technology has become the most promising refrigeration technology in the future due to its advantages of low energy consumption, no pollution, low noise, small size, easy maintenance, and long life. The principle of magnetic refrigeration is to use the magnetocaloric effect of the material (the change of the external magnetic field causes the change of the magnetic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/14B22F3/24H01F1/01
CPCB22F1/0003B22F3/14B22F3/24B22F2003/248B22F2998/10H01F1/015
Inventor 钟喜春董旭涛彭得然刘仲武焦东玲张辉余红雅邱万奇
Owner SOUTH CHINA UNIV OF TECH
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