A kind of 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 small magnetic entropy and commercial application limitations, and achieve the effect of good thermal stability and good glass forming ability.

Active Publication Date: 2018-10-23
NORTHEASTERN UNIV LIAONING
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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

An Er-based amorphous low-temperature magnetic refrigeration material and a preparation method thereof; the general chemical formula of the material is: EraTbAlc, wherein T is one of Fe, Co, Ni or Cu, a is 56-63, and b is 18- 33, c is 16 to 28, and a+b+c=100; method: 1) prepare materials, slightly excessive Er; 2) arc melting under inert gas conditions until it is completely melted, naturally cool after heat preservation, and repeatedly smelt to obtain a uniform composition Alloy ingot; 3) After the surface is cleaned, it is broken into small pieces of alloy ingot; 4) The ingot is completely melted under the condition of inert gas by using an induction melting and throwing belt device, and the belt is thrown after heat preservation to obtain Er-based amorphous low temperature Magnetic refrigeration material; the material of the present invention has a width of 2-2.8mm and a thickness of 35-42m; under a magnetic field change of 0-7T, the magnetic transition temperature is 8-18K, the maximum magnetic entropy change is 12.6-22.5J / kgK, and the magnetic refrigeration capacity is 480- 620J / kg; glass transition temperature 550-640K, crystallization temperature 640-700K, cold liquid phase width 33-65K.

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 Patents(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 LIAONING
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