Gd-based amorphous nanocrystal composite with high Curie temperature and refrigerating capacity and preparation method of Gd-based amorphous nanocrystal composite

A technology of amorphous, nanocrystalline and cooling capacity, applied in the field of Gd-based amorphous and nanocrystalline composite materials and its preparation, can solve the problems of limiting the application of magnetic refrigeration materials, difficult to balance, high Curie temperature, etc.

Active Publication Date: 2016-01-06
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult for this kind of Gd-rich nanocrystalline amorphous nanocrystalline composite to take into account the high Curie temperature and high magnetic entropy change, which limits its application as a magnetic refrigeration material to a large extent.
For example, Y.T.Wang et al. reported that Fe 30 Gd 60 Al 10 The Curie temperature can reach 200K, but its magnetic entropy change is only 3.53J/kgK; Fe 15 Gd 70 Al 15 The magnetic entropy change

Method used

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  • Gd-based amorphous nanocrystal composite with high Curie temperature and refrigerating capacity and preparation method of Gd-based amorphous nanocrystal composite
  • Gd-based amorphous nanocrystal composite with high Curie temperature and refrigerating capacity and preparation method of Gd-based amorphous nanocrystal composite
  • Gd-based amorphous nanocrystal composite with high Curie temperature and refrigerating capacity and preparation method of Gd-based amorphous nanocrystal composite

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Embodiment 1

[0029] In this embodiment, the molecular formula of the amorphous nanocrystalline composite material is Gd 80 Fe 11.3 Al 8.7 .

[0030] The amorphous-nanocrystalline composite Gd 80 Fe 11.3 Al 8.7 The preparation includes the following steps:

[0031] Step 1: Elements Gd, Fe and Al with a purity of 99.99% or more are separated according to Gd 80 Fe 11.3 Al 8.7 The atomic ratio of each element in the sample is evenly mixed to obtain the raw material, and the total weight of the raw material is 20g;

[0032] Step 2: Put the raw materials prepared in step 1 into a non-consumable vacuum arc melting furnace, use Ti to absorb oxygen, and pump low vacuum and high vacuum to 7×10 -4Pa; then fill the furnace cavity with high-purity argon to clean it, use high-purity argon of 0.5-0.7 atmospheres as a protective gas, repeat the smelting for 6 times, and obtain a master alloy ingot with uniform composition after cooling;

[0033] Step 3: Grinding the master alloy ingot obtained i...

Embodiment 2

[0039] In this embodiment, the molecular formula of the amorphous nanocrystalline composite material is Gd 90 Fe 5.7 al 4.3 .

[0040] The amorphous-nanocrystalline composite Gd 90 Fe 5.7 al 4.3 The preparation includes the following steps:

[0041] Step 1: Elements Gd, Fe and Al with a purity of 99.99% or more are separated according to Gd 90 Fe 5.7 al 4.3 The atomic ratio of each element in the sample is evenly mixed to obtain the raw material, and the total weight of the raw material is 20g;

[0042] Step 2: Put the raw materials prepared in step 1 into a non-consumable vacuum arc melting furnace, use Ti to absorb oxygen, and use mechanical pump and molecular pump to pump high vacuum to 7×10 -4 Pa; then fill in high-purity argon to clean the furnace cavity three times, fill in high-purity argon with a pressure of about 0.5-0.7 atmospheres as a protective gas, repeat smelting for 6 times, and obtain an alloy ingot with uniform composition after cooling;

[0043] St...

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Abstract

The invention discloses a Gd-based amorphous nanocrystal composite with high Curie temperature and refrigerating capacity. The chemical formula of the Gd-based amorphous nanocrystal composite is GdaFebAlc, wherein a, b and c refer to atom contents of corresponding elements, a is larger than or equal to 75 and smaller than or equal to 92, b is larger than or equal to 5 and smaller than or equal to 20, c is larger than or equal to 4 and smaller than or equal to 15, and the equation of a+b+c=100 is met. Compared with the prior art, the Gd-based amorphous nanocrystal composite has the high Curie temperature, and meanwhile has the large magnetic entropy change, the Curie temperature of the composite is more than 200 K, the magnetic entropy change under a 5 T magnetic field is larger than 5.0 J/kg/K, the magnetic transition temperature interval is large, and the refrigerating capacity reaches up to 690 J/kg or above. Thus, the composite is a good magnetic refrigeration material and can be applied as a near room temperature magnetic refrigeration working medium.

Description

technical field [0001] The invention belongs to the technical field of rare earth-based amorphous and nanocrystalline composite materials, and relates to a Gd-based amorphous and nanocrystalline composite material with high Curie temperature and high refrigeration capacity and a preparation method thereof. Background technique [0002] The traditional gas compression refrigeration technology not only has the greenhouse effect but also may destroy the ozone layer. Compared with it, the magnetic refrigeration technology has the advantages of environmental protection, high efficiency and energy saving, small size, long life and safety and reliability. Therefore, it is necessary to look for high-efficiency magnetic refrigeration materials become a matter of concern to people. [0003] Magnetic refrigeration relies on the magnetocaloric effect to achieve the cooling effect, so the magnetocaloric effect is the basis for the realization of magnetic refrigeration. When a solid magn...

Claims

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Application Information

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IPC IPC(8): C22C45/00C22C1/03
Inventor 郑强张琳琳鲍明东王芳汪金芝
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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