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A hydrogenated heavy rare earth high-entropy composite material and its preparation method and application

A composite material and heavy rare earth technology, applied in the fields of magnetic materials, inorganic material magnetism, transportation and packaging, etc., can solve the problem of low magnetic entropy change of amorphous alloys, improve the magnetic entropy change, improve the ability to form amorphous, reduce Effect of Hysteresis Loss

Active Publication Date: 2022-04-26
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Purpose of the invention: To solve the problem of low magnetic entropy change of existing heavy rare earth high-entropy amorphous alloys, the present invention provides a hydrogenated heavy rare-earth high-entropy composite material. The precipitation of rare earth hydrides can greatly increase the magnetic entropy of amorphous alloys At the same time, it also provides a preparation method of the hydrogenated heavy rare earth high-entropy composite material; in addition, the present invention also provides an application of the hydrogenated heavy rare earth high-entropy composite material as a magnetic refrigerant

Method used

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  • A hydrogenated heavy rare earth high-entropy composite material and its preparation method and application
  • A hydrogenated heavy rare earth high-entropy composite material and its preparation method and application
  • A hydrogenated heavy rare earth high-entropy composite material and its preparation method and application

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Embodiment 1

[0045] The chemical formula for preparation is Gd 20 Tb 18 Dy 18 co 20 al 24 h 130.65 heavy rare earth high-entropy composites.

[0046] The preparation process is as follows:

[0047] Step 1, the Gd, Tb, Dy, Co, Al raw materials with a purity greater than 99.9wt.% are formulated according to the molecular formula Gd 20 Tb 18 Dy 18 co 20 al 24 Indicated atomic percentage ingredients;

[0048] Step 2, put the raw materials weighed in step 1 in the water-cooled copper crucible of the electric arc melting furnace, close the cavity, and first evacuate the cavity to 3×10 -3 Below Pa, then fill it with high-purity argon protection for smelting. First, smelt the titanium ingot for 3-5 minutes to further remove the residual oxygen in the cavity, and then melt the alloy ingot twice with a low current (150-180A), and then use a high current (270-180A) to melt the alloy ingot twice. 300A) Melting the alloy ingot four times, flipping the alloy ingot before each smelting, and t...

Embodiment 2

[0066] Referring to Example 1, the preparation chemical molecular formula is Gd 20 Tb 18 Dy 18 co 20 al 24 h 43.2 heavy rare earth high-entropy composites.

[0067] The difference lies in step 5: under the protection of high-purity argon, place the high-entropy amorphous alloy powder prepared in step 4 in the hydrogen absorption device, set the hydrogen pressure in the cavity to 5MPa, heat the sample to 265°C and keep it warm for isothermal hydrogen absorption , The isothermal time is 12h. The mass fraction of inhaled hydrogen is 0.4%, after conversion into atomic percentage, the molecular formula of the obtained hydrogenated heavy rare earth high-entropy composite material is Gd 20 Tb 18 Dy 18 co 20 al 24 h 43.2 .

[0068] The XRD spectrum of the above-mentioned hydrogenated high-entropy amorphous alloy powder is as follows Figure 11 As shown, it can be seen that, similar to the sample obtained in Example 1, GdH was precipitated on the amorphous matrix after a l...

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Abstract

The invention discloses a hydrogenated heavy rare earth high-entropy composite material, a preparation method and application thereof. The chemical molecular formula of the hydrogenated heavy rare earth high-entropy composite material is A 20 B 18 C 18 co 20 al 24 h x , wherein A, B, and C are different from each other, and are respectively selected from one of Gd, Tb, Dy, Ho, Er, and Tm, and x>0. The preparation method includes: weighing the corresponding raw materials according to the chemical molecular formula of the high-entropy composite material; melting and cooling the raw materials to obtain a master alloy ingot; melting the master alloy ingot into an alloy melt, and sucking and casting it into a high-entropy amorphous alloy rod The material is crushed and ball-milled to obtain high-entropy amorphous alloy powder; the powder is treated with isothermal hydrogen absorption to obtain a hydrogenated heavy rare earth high-entropy composite material. The invention induces the precipitation of rare earth hydrides in the amorphous matrix by performing isothermal hydrogen absorption treatment on the high-entropy amorphous alloy, greatly improves the magnetic entropy change of the alloy, and at the same time significantly reduces the hysteresis loss of the alloy. The hydrogenated heavy rare earth high-entropy composite material can be used as a magnetic refrigerant.

Description

technical field [0001] The invention relates to a high-entropy amorphous alloy and its preparation method and application, in particular to a hydrogenated heavy rare earth high-entropy composite material and its preparation method and application, belonging to the field of magnetic refrigeration. Background technique [0002] In recent years, the magnetic refrigeration technology based on the magnetocaloric effect has attracted extensive attention of scientific researchers. Compared with traditional air compression refrigeration technology, magnetic refrigeration has the advantages of high refrigeration efficiency, environmental protection, no pollution, and low vibration and noise. It has broad application prospects in refrigerators, air conditioners, precision instruments, aerospace and other refrigeration fields, and is known as the second Eleventh century refrigeration technology. The core of magnetic refrigeration technology is magnetic refrigeration working fluid. Aft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/00C22C1/00B22F9/04B22F1/08B22F1/145H01F1/01
CPCC22C45/00B22F9/002B22F9/04H01F1/015B22F2009/043B22F1/142B22F1/145C22C1/11
Inventor 沈宝龙邵里良薛琳张耀袁子蕊王倩倩
Owner SOUTHEAST UNIV
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