Rare earth high-entropy alloy material with high saturation magnetization and preparation method thereof

A magnetization, high-entropy alloy technology, applied in magnetic materials, magnetic objects, electrical components, etc., can solve problems such as unfavorable high saturation magnetization, and achieve the effects of low equipment cost, simple preparation method, and simple sample matching.

Inactive Publication Date: 2020-09-29
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] According to the prior art, the applicant focused on researching suitable combinations of rare earth elements in order to increase the saturation magnetization of high-entropy alloys. Prior art document 4 (Yuan Y, Wu Y, Tong X, et al. Rare-earth high- entropy alloys with giant magnetocaloric effect[J]. ACTA MATERIALIA, 2017,125:481-489.) reported Gd composed of four elements: Gd, Tb, Ho and Er 25 Er 25 Ho 25 Tb 25 alloy, the document briefly introduces the magnetocaloric effect of the alloy, but does not involve the study of the properties related to the saturation magnetization. After research by the applicant, it is found that the reason why the material does not have a high saturation magnetization is that the material is in order to achieve a high Magnetocaloric effect, using both trigonal (TRI) and hexagonal close-packed (HCP) crystal structures, which are not conducive to achieving high saturation magnetization

Method used

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  • Rare earth high-entropy alloy material with high saturation magnetization and preparation method thereof
  • Rare earth high-entropy alloy material with high saturation magnetization and preparation method thereof
  • Rare earth high-entropy alloy material with high saturation magnetization and preparation method thereof

Examples

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Effect test

Embodiment 1

[0048] A preparation method of a GdTbHoEr high saturation magnetization material, comprising the following steps:

[0049] According to the chemical formula of GdTbHoEr, the raw materials Gd, Tb, Ho and Er were weighed, and the prepared samples were prepared into high-entropy alloy GdTbHoEr by vacuum arc melting.

[0050] In order to detect the composition structure of the sample, an X-ray diffraction test was carried out, and the test results are as follows: figure 1 As shown, the GdTbHoEr material has a hexagonal close-packed single-phase crystal structure.

[0051] In order to verify that the sample has a single-phase structure, a metallographic test is carried out. The specific method is to grind out the metallographic phase after slicing the sample, and observe the metallographic phase with a scanning electron microscope (SEM). The test results are as follows figure 2 As shown, the SEM picture shows that there is only one phase structure in the sample.

[0052] In orde...

Embodiment 2

[0071] A preparation method of a GdTbHoEr material with high saturation magnetization, the unexplained steps are the same as those in Example 1, except that La element is added on the basis of GdTbHoEr.

[0072] The magnetic properties of the resulting GdTbHoErLa, as Figure 14 As shown, the saturation magnetization at 7K is 189.8 emu / g, and the coercive force is 1473 Oe.

[0073] The magnetization of the resulting GdTbHoErLa varies with temperature as Figure 16 As shown, the magnetic transition temperature is about 127K.

Embodiment 3

[0075] A preparation method of a GdTbHoEr material with high saturation magnetization, the unexplained steps are the same as those in Example 1, except that two elements La and Y are added to GdTbHoEr.

[0076] The magnetic properties of the resulting GdTbHoErLaY, as Figure 15 As shown, the saturation magnetization at 7K is 176.1 emu / g, and the coercive force is 1706 Oe.

[0077] The magnetization of the resulting GdTbHoErLaY varies with temperature as Figure 17 As shown, the magnetic transition temperature is about 120K.

[0078] By contrasting Example 1, Example 2 and 3, the following conclusions can be obtained:

[0079] 1. Adding La and Y to the high-entropy alloy GdTbHoEr as the matrix can control the magnetic transition temperature of the alloy in the range of 190K to 120K;

[0080] 2. Adding La and Y to the high-entropy alloy GdTbHoEr as the matrix can control the coercive force of the alloy in the range of 600 Oe to 1706 Oe.

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Abstract

The invention discloses a GdTbHoEr material with high saturation magnetization. The GdTbHoEr material is prepared by taking Gd, Tb, Ho and Er as raw material and carrying out electric arc melting, wherein the chemical formula of the material is GdTbHoEr, and the material with high saturation magnetization has a single close-packed hexagonal crystal structure; and the element components further comprise one or two of La and Y. When being used as a magnetic material, the material has the magnetic phase transformation characteristic, and the saturation magnetization reaches 290-300 emu/g when thetemperature is lower than the Neel temperature; the high-entropy alloy GdTbHoEr is used as a matrix, La and Y are added, the magnetic transition temperature of the alloy is regulated and controlled within the range of 190 K-120 K, and the coercive force of the alloy is regulated and controlled within the range of 600 Oe -1706 Oe. The high-saturation magnetization intensity material has the characteristics of high magnetization intensity, wide existing temperature range, adjustable components, adjustable Neel temperature, simple and diversified process and low overall preparation cost, and issuitable for industrial production.

Description

technical field [0001] The invention belongs to the field of high saturation magnetization materials, in particular to a rare earth high-entropy alloy material with high saturation magnetization and a preparation method thereof. Background technique [0002] Now that people's lives have entered the information age, the rapid development of contemporary information technology and the computer industry has also brought great challenges to the performance improvement of magnetic devices and magnetic materials. As a new type of soft magnetic material, soft magnetic composite material has high saturation magnetic induction, high magnetic permeability and low loss, which provide the possibility for miniaturization, intelligence, high integration and energy saving of magnetic devices. [0003] Soft magnetic composite material is a kind of composite material prepared by powder metallurgy process. Metal magnetic powder is used as raw material. After a series of insulation coating and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02H01F1/147
CPCC22C1/02C22C30/00H01F1/147
Inventor 马垒卢世翻饶光辉王江杜玉松李林赵景泰
Owner GUILIN UNIV OF ELECTRONIC TECH
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