Rare-earth-based high-entropy amorphous alloy high in magnetocaloric effect and preparation method thereof

An amorphous alloy, rare earth-based technology, applied in the field of rare earth-based high-entropy amorphous alloys with large half-peak width and high magnetocaloric effect and its preparation, can solve the problem of increasing time and energy costs, only relative magnetic refrigeration capacity, and magnetic phase The problem of changing the narrow temperature range and other issues can achieve high energy utilization efficiency, improve thermal stability and magnetic entropy, and improve the effect of soft magnetic properties

Active Publication Date: 2019-12-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When strict environmental protection requirements made it difficult to continue traditional compression refrigeration, people began to do a lot of exploration on new magnetic refrigeration materials, and prepared a series of magnetic refrigeration materials with giant magnetocaloric effects, including Gd 5 (SixGe1-x) 95 , MnFeGeZn, DyYCo, LaFeCoSi and their hydrides and other series alloys, these alloys show a giant magnetic effect, and a large magnetic entropy change near the Curie temperature, but these materials have a narrow magnetic phase transition temperature range and poor cooling capacity
Chinese patent CN102965562A discloses a magnetic refrigeration

Method used

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  • Rare-earth-based high-entropy amorphous alloy high in magnetocaloric effect and preparation method thereof
  • Rare-earth-based high-entropy amorphous alloy high in magnetocaloric effect and preparation method thereof
  • Rare-earth-based high-entropy amorphous alloy high in magnetocaloric effect and preparation method thereof

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Embodiment 1

[0035] In this embodiment, the molecular formula of the rare earth-based high-entropy amorphous alloy material is Gd 25 co 25 Al 25 Y 15 Dy 10 .

[0036] The preparation method of the rare earth-based high-entropy amorphous alloy material is as follows:

[0037] (1) The raw materials of gadolinium, cobalt, aluminum, yttrium and dysprosium with a purity greater than 99% according to the molecular formula Gd 25 co 25 Al 25 Y 15 Dy 10 The atomic percentage of the ingredients shown is for weighing and batching;

[0038] (2) Put the raw material prepared in step 1 into the water-cooled copper crucible of the electric arc melting furnace, close the door of the melting furnace chamber, and the vacuum degree in the chamber is 5×10 -3 Under the condition of Pa, fill in inert gas for protective smelting. After the raw material is melted by the arc, the arc is turned off after continuous smelting for 3 minutes, and the master alloy is cooled with the crucible. After the master ...

Embodiment 2

[0044] In this embodiment, the molecular formula of the rare earth-based high-entropy amorphous alloy material is Gd 25 co 25 Al 25 Y 15 Er 10 .

[0045] The preparation method of the rare earth-based high-entropy amorphous alloy material is as follows:

[0046] (1) Gadolinium, cobalt, aluminum, yttrium, and erbium raw materials with a purity greater than 99% are prepared according to the molecular formula Gd 25 co 25 Al 25 Y 15 Er 10 The atomic percentages of the ingredients shown are used for batching;

[0047] (2) Put the raw material prepared in step 1 into the water-cooled copper crucible of the electric arc melting furnace, close the door of the melting furnace chamber, and the vacuum degree in the chamber is 4×10 -3 Under the condition of Pa, fill in inert gas for protective melting. After the raw materials are melted by the arc, the arc is turned off after continuous melting for 10 minutes, and the master alloy is cooled with the crucible. After the master al...

Embodiment 3

[0053] In this embodiment, the molecular formula of the rare earth-based high-entropy amorphous alloy material is Gd 25 co 25 Al 25 Y 15 Ho 10 .

[0054] The preparation method of the rare earth-based high-entropy amorphous alloy material is as follows:

[0055] (1) Gadolinium, cobalt, aluminum, yttrium, and holmium raw materials with a purity greater than 99% are prepared according to the molecular formula Gd 25 co 25 Al 25 Y 15 Ho 10 The atomic percentages of the ingredients shown are used for batching;

[0056] (2) Put the raw material prepared in step 1 into the water-cooled copper crucible of the electric arc melting furnace, close the door of the melting furnace chamber, and the vacuum degree in the chamber is 5×10 -3 Under the condition of Pa, fill in inert gas for protective melting. After the raw materials are melted by the arc, the arc is turned off after continuous melting for 5 minutes, and the master alloy is cooled with the crucible. After the master al...

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Abstract

The invention discloses a rare-earth-based high-entropy amorphous alloy material high in magnetocaloric effect. The molecular formula of the rare-earth-based high-entropy amorphous alloy is GdaCobAlcYdMe, wherein a, b, c, d and e represent the atom percentage content of the corresponding element, a is larger than or equal to 24.8 and smaller than or equal to 25, b is larger than or equal to 8 andsmaller than or equal to 25.4, c is larger than or equal to 24.8 and smaller than or equal to 25.4, d is larger than or equal to 5 and smaller than or equal to 15, e is larger than or equal to 10 andsmaller than or equal to 20, a+b+c+d+e is equal to 100, and M is one of Dy, Er and Ho. On the basis of a GdCoAly high-entropy amorphous alloy, M is used for replacing Y, the high-entropy amorphous alloy high in magnetocaloric effect is obtained, the alloy is stable in magnetocaloric performance, the magnetic variation temperature range is wide, and elements likely to volatile or oxidize are not included. In addition, the completely amorphous structure of the high-entropy amorphous alloy needs no crystallization heat treatment, the preparation process is simple, and the high-entropy amorphous alloy material has good magnetocaloric performance and has good application prospects in the technical field of magnetic refrigeration.

Description

technical field [0001] The invention relates to a rare earth-based high-entropy amorphous alloy magnetic refrigeration material technology, in particular to a rare-earth-based high-entropy amorphous alloy with large half-peak width and high magnetocaloric effect and a preparation method thereof. Background technique [0002] Since the 21st century, the contradiction between man and nature has become increasingly prominent, and environmental issues have become important issues affecting people's living standards and future development. Global warming has become one of the main threats to the world's environmental security, and the greenhouse gases that cause global warming have gradually become an important consideration for governments to formulate environmental policies. Therefore, there is an urgent need to develop a refrigeration material that is green, safe, high in refrigeration efficiency and does not emit greenhouse gases. Different from the traditional gas mechanica...

Claims

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Application Information

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IPC IPC(8): C22C45/00B22D11/06C22C1/03
CPCC22C45/00C22C1/03B22D11/06C22C1/11
Inventor 袁晨晨庞昌蒙陈磊徐浩郭威沈宝龙
Owner SOUTHEAST UNIV
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