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Gd-Ni-Al-based amorphous and nanocrystalline composite material and preparation method thereof

A technology of amorphous nanocrystalline and composite materials, which is applied in the field of Gd-Ni-Al based amorphous nanocrystalline composite materials and its preparation, can solve the problems of limiting the refrigeration application of magnetic refrigeration working fluid materials, and achieve the expansion of refrigeration application scope, The effect of large cooling capacity

Inactive Publication Date: 2016-09-28
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most magnetic refrigeration materials only have one refrigeration zone, which limits the refrigeration application of magnetic refrigeration materials.

Method used

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  • Gd-Ni-Al-based amorphous and nanocrystalline composite material and preparation method thereof
  • Gd-Ni-Al-based amorphous and nanocrystalline composite material and preparation method thereof
  • Gd-Ni-Al-based amorphous and nanocrystalline composite material and preparation method thereof

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Embodiment 1

[0037]In this embodiment, the molecular formula of the amorphous nanocrystalline composite material is Gd 80 Ni 11.6 al 8.4 .

[0038] The amorphous-nanocrystalline composite Gd 80 Ni 11.6 al 8.4 The preparation includes the following steps: Step 1: elemental Gd with a purity of 99% and Ni and Al with a purity of 99.9% according to Gd 80 Ni 11.6 al 8.4 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;

[0039] 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 -4 Pa; 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;

[0040] Step 3: Grinding the master alloy ingot obtained in step 2...

Embodiment 2

[0049] In this embodiment, the molecular formula of the amorphous nanocrystalline composite material is Gd 90 Ni 5.8 al 4.2 .

[0050] The amorphous-nanocrystalline composite Gd 90 Ni 5.8 al 4.2 The preparation includes the following steps:

[0051] Step 1: Elements Gd, Ni and Al with a purity of 99.99% or more are 90 Ni 5.8 al 4.2 The atomic ratio of each element is uniformly mixed to obtain the raw material, and the total weight of the raw material is 20g;

[0052] 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 chamber 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 a master alloy ingot with uniform composition after cooling;

[0053] Step 3: Grinding the alloy ingot...

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Abstract

The invention discloses a Gd-Ni-Al-based amorphous and nanocrystalline composite material. The molecular formula of the Gd-Ni-Al-based amorphous and nanocrystalline composite material is GdaNibAlc, wherein a, b and c represent atom contents of corresponding elements, 80<=a<=90, 5.8<=b<=11.6, 4.2<=c<=8.4, and the equation that a+b+c=100 is satisfied. The Gd-Ni-Al-based amorphous and nanocrystalline composite material is of an amorphous / nanocrystalline complex phase structure and has two refrigeration temperature zones and one or two magnetic entropy change platforms, the high-temperature magnetic order temperature is 270 K or above, and the magnetic entropy change under a 5T magnetic field can reach 6.7 J / kg / K. Because magnetic transition temperature intervals are wide, the refrigeration capacity reaches up to 640 J / kg or above, and the Gd-Ni-Al-based amorphous and nanocrystalline composite material is a good magnetic refrigeration material and can be used as a magnetic refrigeration working material in the two intervals of the two refrigeration temperature zones.

Description

technical field [0001] The invention relates to the technical field of rare earth-based amorphous and nanocrystalline composite materials, in particular to a Gd-Ni-Al-based amorphous and nanocrystalline composite material with a magnetic entropy change platform and dual cooling and temperature zones 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 refrig...

Claims

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Application Information

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IPC IPC(8): C22C45/00C22C1/03B22D11/06C09K5/14
CPCB22D11/0611C09K5/14C22C1/03C22C45/00
Inventor 郑强张琳琳
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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