Rereearth-iron base compound magnetic refrigeration material with large magnetic entropy change and preparation process thereof

A technology of magnetic refrigeration materials and compounds, applied in the direction of magnetic materials, magnetic objects, machine operation methods, etc., can solve the problems that it is difficult to meet the requirements of magnetic refrigeration materials, and achieve the effect of abundant raw materials, simple preparation process and low cost

Inactive Publication Date: 2003-10-22
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] To sum up, it is difficult for existing materials to meet the basic requirements of practical magnetic refrigeration materials that the Curie point can be adjusted in a wide range through composition changes while maintaining a large magnetic entropy change.

Method used

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  • Rereearth-iron base compound magnetic refrigeration material with large magnetic entropy change and preparation process thereof
  • Rereearth-iron base compound magnetic refrigeration material with large magnetic entropy change and preparation process thereof
  • Rereearth-iron base compound magnetic refrigeration material with large magnetic entropy change and preparation process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 5

[0169] Figure 13The La(Fe 1-y co y ) 11.9 Si 1.1 (y=0.04, 0.06, 0.08) isothermal magnetic entropy change versus Gd. It can be seen from the figure that: near room temperature, the magnetic entropy change of this series of compounds is equal to or higher than twice that of Gd. Embodiment 5 prepares La (Fe 1-y m y ) 13-z Si z (M are Co, A1 and combination respectively, y=0.0676~0.194, z=0~1.17)

[0170] Compound La(Fe 1-y m y ) 13-z Si z (M are Co, Al and combination respectively, y=0.0676-0.194, z=0-1.17). Under the magnetic field change of 0-5 Tesla, the comparison between its isothermal magnetic entropy change and Gd is as follows: Figure 14 shown. It can be seen from the figure that through Al, Co and their combinations, we can easily adjust the Curie point from ~190K to above room temperature, and the magnetic entropy change is at or above twice that of Gd. Embodiment 6 prepares LaFe 13-z Si z C α (z=1.4, 1.5, α=0~0.6)

[0171] The direct smelting and ...

Embodiment 7

[0176] The LaFe prepared by embodiment 7 11.7 Si 1.3 N 0.2 The isothermal magnetization curve around the Curie temperature is as Figure 18 shown.

[0177] Figure 19 is based on Figure 18 Calculated LaFe 11.7 Si 1.3 N 0.2 Isothermal magnetic entropy change versus temperature curves for interstitial compounds. It can be seen from the figure: LaFe 11.7 Si 1.3 N 0.2 Interstitial compound Curie point T C Be 208K, compare the LaFe of embodiment 3 11.7 Si 1.3 Master Alloy (T C 190K) increased by 18K; under the change of external magnetic field from 0 to 5T, the magnetic entropy change at the Curie point reaches 15.47J / kg.K, which is 1.587 times that of Gd (9.75J / kg.K). Embodiment 8 prepares La 0.9 Gd 0.1 (Fe 0.7 co 0.2 mn 0.1 ) 11.6 Si 1.4 h 0.8

[0178] Prepare La by the technique of embodiment 2 0.9 Gd 0.1 (Fe 0.7 co 0.2 mn 0.1 ) 11.6 Si 1.4 h 0.8 Among them, H in the high pressure vessel 2 The pressure is 5.5 MPa, and the hydrogen absorption time ...

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Abstract

The present invention relates to a rare earth-iron base compound magnetic refrigeration material with large magnetic entropy change and its preparation method. Its chemical general formula is La1-xRx(Fe1-yMy)13-zSizX alpha, in which R is more than one rare earth elements and its combination, M is more than one kind of Al, Co and Ga, etc. and its combination, X ix more than one kind of C, H, N andcombination of them, x is 0-0.4, y is 0-0.3, z is 0-3.0 and alpha is 0.3.0. Its preparation method includes the following steps: utilizing direct smelting and annealing treatment to can prepare La1-xRx(Fe1-yMy)13-zSiz and low C-content La1-xRx(Fe1-yMy)13-zSiz alpha gap compound, and utilizing smelting, quickly-quenching and annealing treatment to prepare high C-content La1-xRx(Re1-yMy)13-zSizC alpha gas compound.

Description

technical field [0001] The invention relates to a magnetic material, in particular to a rare earth-iron-based compound magnetic refrigeration material with large magnetic entropy change and a preparation method thereof. technical background [0002] Traditional gas compression refrigeration technology is widely used in various industries and has formed a huge industry, but it has disadvantages such as low refrigeration efficiency, high energy consumption, and damage to the atmospheric environment. [0003] Magnetic refrigeration refers to a new type of refrigeration technology that uses magnetic materials as refrigerants. When the magnetic field strength increases (magnetization), the magnetic moments of the magnetic refrigeration material tend to be arranged in an orderly manner, the magnetic entropy decreases, and heat is released to the outside; when the magnetic field strength is weakened (demagnetization), the magnetic moments tend to be arranged in disorder, As the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00F25B21/00
CPCY02B30/66Y02B30/00
Inventor 陈远富沈保根王芳胡凤霞王光军
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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