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Er-based amorphous low-temperature magnetic refrigeration material and preparation method thereof

A low-temperature magnetic refrigeration and amorphous technology, applied in the field of materials science, can solve the problems of low magnetic entropy and commercial application limitations, and achieve good thermal stability and good glass forming ability

Active Publication Date: 2017-07-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the magnetic refrigeration materials in the low temperature region mainly include Gd 3 Ga 5 o 12 , GdLiF 4 Isoparamagnetic metal salts and some rare earth intermetallic compounds, but their commercial application is limited due to their relatively small magnetic entropy change and the need for a large magnetic field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of Er-based amorphous low-temperature magnetic refrigeration material, its general chemical formula is: Er 60 Cu 20 al 20 .

[0038] The above-mentioned Er-based amorphous low-temperature magnetic refrigeration material Er 60 Cu 20 al 20 A preparation method comprising the steps of:

[0039] Step 1, Ingredients:

[0040] Er-based amorphous low-temperature magnetic refrigeration material Er 60 Cu 20 al 20 The composition ratio of raw material Al, the raw material Cu, and the weighed amount of raw material Er are 102% of the theoretical amount; the total sum of the three raw materials is 12g.

[0041] Step 2, smelting to obtain an alloy ingot:

[0042] (1) Put each raw material in the electric arc furnace, vacuumize the electric arc furnace, and the pressure in the furnace reaches 1×10 -2 After Pa, clean the furnace 4 times with high-purity argon gas with a volume purity of 99.99%, and then fill it with high-purity argon gas with a volume purity of 99.99...

Embodiment 2

[0054] A kind of Er-based amorphous low-temperature magnetic refrigeration material, its general chemical formula is: Er 63 co 18 Al 19 .

[0055] The above-mentioned Er-based amorphous low-temperature magnetic refrigeration material Er 63 co 18 Al 19 A preparation method comprising the steps of:

[0056] Step 1, Ingredients:

[0057] Er-based amorphous low-temperature magnetic refrigeration material Er 63 co 18 Al 19 The composition ratio of raw material Al is weighed, raw material Co is weighed, and the weighed amount of raw material Er is 104% of the theoretical amount, and the total sum of the three raw materials is 15g.

[0058] Step 2, smelting to obtain an alloy ingot:

[0059] (1) Put each raw material in the electric arc furnace, vacuumize the electric arc furnace, and the pressure in the furnace is less than 1×10 -2 After Pa, clean the furnace chamber twice with high-purity argon gas with a volume purity of 99.99%, and then fill it with high-purity argon g...

Embodiment 3

[0071] A kind of Er-based amorphous low-temperature magnetic refrigeration material, its general chemical formula is: Er 56 Fe 28 Al 16 .

[0072] The above-mentioned Er-based amorphous low-temperature magnetic refrigeration material Er 56 Fe 28 Al 16 A preparation method comprising the steps of:

[0073] Step 1, Ingredients:

[0074] Er-based amorphous low-temperature magnetic refrigeration material Er 56 Fe 28 Al 16 The composition ratio of raw material Al is taken by weighing raw material Fe, and the weighing amount of raw material Er is 103% of theoretical consumption;

[0075] Step 2, smelting to obtain an alloy ingot:

[0076] (1) Put each raw material in the electric arc furnace, vacuumize the electric arc furnace, and the pressure in the furnace reaches 1×10 -2 After Pa, clean the furnace chamber for 3 times with high-purity argon gas with a volume purity of 99.99%, and then fill it with high-purity argon gas with a volume purity of 99.99% to make the pressu...

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Abstract

The invention relates to an Er-based amorphous low-temperature magnetic refrigeration material and a preparation method thereof. The Er-based amorphous low-temperature magnetic refrigeration material has a general chemical formula: EraTbAlc, wherein T is one of Fe, Co, Ni or Cu; a ranges from 56 to 63, b ranges from 18 to 33, c ranges from 16 to 28, and a plus b plus c is equal to 100. The method comprises the steps of (1) preparing materials, wherein Er is slightly excessive; (2) carrying out electric arc melting until completely melting under an inert gas condition, naturally cooling after heat preservation, and repetitively melting to obtain an alloy ingot with homogeneous compositions; (3) after cleaning a surface, crushing into small blocks of alloy ingots; and (4) adopting an induction melting melt-spinning device for completely melting the ingots under an inert gas condition, carrying out melt-spinning after heat preservation, and obtaining the Er-based amorphous low-temperature magnetic refrigeration material. The material provided by the invention has the width ranging from 2 to 2.8mm and the thickness ranging from 35 to 42mm; under 0 to 7T magnetic variation, the magnetic transition temperature ranges from 8 to 18K, the maximal magnetic entropy ranges from 12.6 to 22.5J / kgK, and the magnetic refrigerant capacity ranges from 480 to 620J / kg; and the glass transition temperature ranges from 550 to 640K, the crystallization temperature ranges from 640 to 700K, and the cold liquid phase region width ranges from 33 to 65K.

Description

technical field [0001] The invention belongs to the technical field of materials science and relates to a magnetic functional material, in particular to an Er-based amorphous low-temperature magnetic refrigeration material and a preparation method thereof. Background technique [0002] Magnetic refrigeration material is a new type of magnetic functional material, which is a non-polluting refrigerant material that uses the magnetic entropy effect of magnetic materials to achieve refrigeration. The magnetic entropy effect is one of the intrinsic properties of magnetic materials, and its size depends on the intrinsic physical properties of magnetic materials. Magnetic refrigeration is the use of an external magnetic field to make the magnetic moment of the magnetic working medium change in an orderly and disorderly manner (phase transition), causing the magnet to absorb heat and release heat to perform a refrigeration cycle. [0003] Magnetic refrigeration is considered as a "...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/00C22C1/02B22D11/06H01F1/01
CPCH01F1/015C22C1/02C22C45/00B22D11/001B22D11/06C22C1/11
Inventor 李领伟袁冶周生强霍德璇
Owner NORTHEASTERN UNIV
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