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Preparation method of high-coercivity anisotropic flake samarium-cobalt nano-crystal magnet

An anisotropic, high coercivity technology, applied in the field of preparation of high coercivity anisotropic sheet-like samarium cobalt nanocrystalline magnets, can solve the problem of low magnetocrystalline anisotropy field and Curie temperature, difficult to obtain High coercivity, high temperature magnetic properties and other problems, to achieve the effect of obvious changes in structure, low energy consumption and simple process

Inactive Publication Date: 2019-03-08
CHINA JILIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have found that traditional NdFeB-based nanocrystalline magnets are difficult to obtain high coercive force and high-temperature magnetic properties due to their low magnetocrystalline anisotropy field and Curie temperature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Using samarium, cobalt, iron, copper, and zirconium with a purity of greater than 99.98% as raw materials, under the protection of inert gas, the alloy composition prepared by smelting is Sm: 20.5wt.%, Co: 58.3wt.%, Fe: 6.5wt. %, Cu: 7.8wt.%, Zr: 6.9wt.% Sm-Co-Fe-Cu-Zr master alloy ingot;

[0020] 2) The Sm-Co-Fe-Cu-Zr master alloy ingot obtained in step (1) is removed from the surface oxide scale and broken into small pieces of Sm-Co-Fe-Cu-Zr alloy, and placed in absolute ethanol Ultrasonic cleaning;

[0021] 3) Put the Sm-Co-Fe-Cu-Zr small alloy obtained in step (2) into a quartz tube with a square hole in the lower end and a size of 0.4mm*0.4mm, and use the copper mold injection method and apply low pressure Pulsed axial magnetic field, the magnetic field strength of the low pulsed magnetic field is 0.5T. Through the magnetization of the pulsed magnetic field, the Sm-Co-Fe-Cu-Zr alloy realizes the preferential orientation of the crystal grains during the rapid solidif...

Embodiment 2

[0027] 1) Using samarium, cobalt, iron, copper, and zirconium with purity greater than 99.98% as raw materials, under the protection of inert gas, the alloy composition prepared by smelting is Sm: 21.5wt.%, Co: 57wt.%, Fe: 6.8wt.% , Cu: 7.8wt.%, Zr: 6.9wt.% Sm-Co-Fe-Cu-Zr master alloy ingot;

[0028] 2) The Sm-Co-Fe-Cu-Zr master alloy ingot obtained in step (1) is removed from the surface oxide scale and broken into small pieces of Sm-Co-Fe-Cu-Zr alloy, and placed in absolute ethanol Ultrasonic cleaning;

[0029] 3) Put the Sm-Co-Fe-Cu-Zr small alloy obtained in step (2) into a quartz tube with a square hole in the lower end and a size of 0.4mm*0.4mm, and use the copper mold injection method and apply low pressure Pulsed axial magnetic field, the magnetic field strength of the low pulsed magnetic field is 0.7T. Through the magnetization of the pulsed magnetic field, the Sm-Co-Fe-Cu-Zr alloy realizes the preferred orientation of the crystal grains during the rapid solidification pr...

Embodiment 3

[0035] 1) Using samarium, cobalt, iron, copper, and zirconium with a purity greater than 99.98% as raw materials, under the protection of inert gas, the alloy composition prepared by smelting is Sm: 25.5wt.%, Co: 52.8wt.%, Fe: 7.0wt. %, Cu: 7.8wt.%, Zr: 6.9wt.% Sm-Co-Fe-Cu-Zr master alloy ingot;

[0036] 2) The Sm-Co-Fe-Cu-Zr master alloy ingot obtained in step (1) is removed from the surface oxide scale and broken into small pieces of Sm-Co-Fe-Cu-Zr alloy, and placed in absolute ethanol Ultrasonic cleaning;

[0037] 3) Put the Sm-Co-Fe-Cu-Zr small alloy obtained in step (2) into a quartz tube with a square hole in the lower end and a size of 0.4mm*0.4mm, and use the copper mold injection method and apply low pressure Pulsed axial magnetic field, the magnetic field strength of the low pulsed magnetic field is 0.9T, through the magnetization of the pulsed magnetic field, the Sm-Co-Fe-Cu-Zr alloy realizes the preferential orientation of the crystal grains during the rapid solidifica...

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Abstract

The invention discloses a preparation method of a high-coercivity anisotropic flake samarium-cobalt nano-crystal magnet. The preparation method comprises the following steps: smelting to acquire Sm-Co-Fe-Cu-Zr master alloy ingot; removing surface oxide skin of the Sm-Co-Fe-Cu-Zr master alloy ingot, crushing into pieces, and performing ultrasonic cleaning; spraying the molten alloy liquid to injectinto copper molds with different thicknesses, and applying low-pulse axial magnetic field; soaking the flake samarium-cobalt nano-crystal magnet into a mixed solution of the Sm6Cu4 alloy nano-powderand absolute ethyl alcohol, and placing in a strong magnetic field annealing furnace in parallel to perform vacuum magnetic field thermal treatment so as to acquire the high-coercivity anisotropic flake samarium-cobalt nano-crystal magnet. The samarium-cobalt nano-crystal magnet prepared through the preparation method disclosed by the invention has high anisotropy and high coercivity. The preparation method disclosed by the invention is simple in process, easy to operate, and capable of reducing the cost, and in favor of the application of the high-coercivity anisotropic flake samarium-cobaltnano-crystal magnet on more permanent magnet devices.

Description

Technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a preparation method of a high coercivity anisotropic sheet-shaped samarium cobalt nanocrystalline magnet. Background technique [0002] With the continuous improvement of productivity, people's application requirements for permanent magnetic materials are also getting higher and higher. In recent years, the rapid development of aerospace technology requires the use of permanent magnet materials to exceed 450°C. The Curie temperature of NdFeB permanent magnets is only about 300°C, and the magnetic properties decay very quickly with temperature. The operating temperature is basically below 150°C, which is far less than the operating temperature of spacecraft and some high-temperature torque motors. Claim. Therefore, how to improve the use temperature and magnetic properties of 2:17 SmCo permanent magnets has become a research focus of scientific researchers. [0003] In add...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/055C22C19/07
CPCC22C19/07H01F1/055H01F41/0273
Inventor 吴琼葛洪良黄益红泮敏翔吴中平
Owner CHINA JILIANG UNIV
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