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A rare earth-based high-entropy amorphous alloy with high magnetocaloric effect and its preparation method

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 narrow variable temperature range can achieve the effects of high energy utilization efficiency, improved magnetic refrigeration capacity, and large amorphous formation capacity.

Active Publication Date: 2021-08-10
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 material with giant magnetocaloric effect, Mn 2-x Fe x Ge z Zn z , 0.8≤x≤0.9, 0.2≤y≤0.27, 0.001≤z≤0.002, the maximum magnetic entropy change is higher than 26Jkg -1 K -1 However, in order to obtain the crystal structure of its single-crystal phase compound, mechanical ball milling and high-temperature sintering are required. The preparation process is complicated and energy-consuming, which greatly increases the time and energy costs for industrialization, hindering its practical application.
However, the alloy has poor forming ability, and its relative magnetic refrigeration capacity is only 325Jkg -1 , which greatly limits the application of the alloy

Method used

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  • A rare earth-based high-entropy amorphous alloy with high magnetocaloric effect and its preparation method
  • A rare earth-based high-entropy amorphous alloy with high magnetocaloric effect and its preparation method
  • A rare earth-based high-entropy amorphous alloy with high magnetocaloric effect and its preparation method

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Effect test

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 with high magnetocaloric effect, and its molecular formula is Gd a co b Al c Y d m e , where a, b, c, d, and e represent the atomic percentages of the corresponding elements, and 24.8≤a≤25.4, 24.8≤b≤25.4, 24.8≤c≤25.4, 5≤d≤15, 10≤e≤ 20, a+b+c+d+e=100, wherein M is one of Dy, Er or Ho. On the basis of GdCoAlY high-entropy amorphous, M element is used to replace Y element to obtain a high-entropy amorphous alloy with high magnetocaloric effect. sexual element. Moreover, the patented high-entropy amorphous alloy has a completely amorphous structure without crystallization heat treatment, and the preparation process is simple. It is a high-entropy amorphous alloy with good magnetocaloric properties and good application prospects in the field of magnetic refrigeration technology. alloy.

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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Patent Type & Authority Patents(China)
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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