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Method for improving the magnetic property of sintered NdFeB flaky magnets

A NdFeB, magnetic performance technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve problems such as difficult to achieve industrialization, achieve high distribution uniformity and thickness consistency, improve organizational structure and composition, Realize the effect of industrialization

Active Publication Date: 2014-11-05
NINGBO YUNSHENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of the physical properties of sintered NdFeB thin-film magnets, the preparation technology of the suspension and the heat treatment technology, it is still difficult to apply the spraying technology to the grain boundary diffusion technology to obtain distribution uniformity and thickness on the surface of the sintered NdFeB thin-film magnets. Coating with high consistency and grain boundary diffusion technology is difficult to achieve industrialization when improving the magnetic properties of sintered NdFeB thin-film magnets

Method used

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  • Method for improving the magnetic property of sintered NdFeB flaky magnets
  • Method for improving the magnetic property of sintered NdFeB flaky magnets
  • Method for improving the magnetic property of sintered NdFeB flaky magnets

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Embodiment 1

[0024] Embodiment 1: A method for improving the magnetic properties of a sintered NdFeB sheet magnet, including the following steps:

[0025] ①Prepare heavy rare earth compound powder, the heavy rare earth compound is DyF3, and the particle size of the powder is ≤10μm;

[0026] ②Disperse the heavy rare earth compound powder in anhydrous ethanol and mix it evenly to obtain a suspension. The viscosity of the anhydrous ethanol at normal temperature and pressure is 1.08mpa.s.

[0027] ③Spray the suspension uniformly on the surface of the sintered NdFeB sheet magnet to form a coating, and the sintered NdFeB sheet magnet has been subjected to surface pretreatment before spraying;

[0028] ④ Dry the sprayed sintered NdFeB thin magnets. The drying process is to keep the temperature at 80℃ for 1h. The dried sintered NdFeB thin magnets are stored in an inert gas environment;

[0029] ⑤ Put the dried sintered NdFeB sheet magnet under the pressure of 1×10 -4 In an inert gas environment of Pa, the d...

Embodiment 2

[0038] Embodiment 2: A method for improving the magnetic properties of a sintered NdFeB sheet magnet, including the following steps:

[0039] ①Prepare heavy rare earth compound powder, the heavy rare earth compound is DyF3, and the particle size of the powder is ≤10μm;

[0040] ② Disperse the heavy rare earth compound powder in a mixed solvent with a viscosity of about 4.0 mPa.s at room temperature and pressure, which is obtained by mixing absolute ethanol and ethylene glycol, and stir uniformly to obtain a suspension.

[0041] ③Spray the suspension uniformly on the surface of the sintered NdFeB sheet magnet to form a coating, and the sintered NdFeB sheet magnet has been subjected to surface pretreatment before spraying;

[0042] ④ Dry the sprayed sintered NdFeB sheet magnets. The drying process is to keep the temperature at 120°C for 1 hour. The dried NdFeB sheet magnets are stored in an inert gas environment;

[0043] ⑤ Put the dried sintered NdFeB sheet magnet under the pressure of 1...

Embodiment 3

[0049] Embodiment 3: A method for improving the magnetic properties of a sintered NdFeB sheet magnet, including the following steps:

[0050] ①Prepare heavy rare earth compound powder, the heavy rare earth compound is DyF3, and the particle size of the powder is ≤10μm;

[0051] ②Disperse the heavy rare earth compound powder in a pva solution prepared by 1788 type polyvinyl alcohol and water. The mass percentage of 1788 type polyvinyl alcohol is 7%. After mixing uniformly, a suspension is obtained. The pva solution is at room temperature. The viscosity is 26mpa.s under normal pressure.

[0052] ③Spray the suspension uniformly on the surface of the sintered NdFeB sheet magnet to form a coating, and the sintered NdFeB sheet magnet has been subjected to surface pretreatment before spraying;

[0053] ④ Dry the sprayed sintered NdFeB sheet magnets. The drying process is to keep the temperature at 120°C for 1h. The dried NdFeB sheet magnets are stored in an inert gas environment;

[0054] ⑤ P...

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Abstract

The invention discloses a method for improving the magnetic property of sintered NdFeB flaky magnets. First, suspension liquid containing heavy rare earth elements and having the viscosity of 0.1 to 500 mpa.s in the conditions of normal temperature and pressure is sprayed onto the surface of a sintered NdFeB flaky magnet uniformly. Second, the sintered NdFeB flaky magnet is dried, and then a coating containing heavy rare earth elements is obtained on the surface of the sintered NdFeB flaky magnet. Finally, the diffusion treatment and the ageing treatment are carried out on the dried sintered NdFeB flaky magnet in the environment of inert gas. The method has the advantages that the spraying technology can be applied to the grain boundary diffusion technique successfully, more specifically, a coating with high distribution uniformity and thickness distribution can be obtained on the surface of sintered NdFeB flaky magnets, and the grain boundary diffusion technology can be applied industrially for improving the magnetic property of sintered NdFeB flaky magnets.

Description

Technical field [0001] The invention relates to a method for processing a sintered NdFeB sheet magnet, in particular to a method for improving the magnetic performance of a sintered NdFeB sheet magnet. Background technique [0002] With the remarkable progress of science and technology and the rapid economic development, the demand for sintered NdFeB materials used in many fields such as scientific research, industry, household appliances and office automation is increasing. High-performance sintered NdFeB materials are used in computers. , Precision machine tools, geophones, measuring instruments, automobile motors and various permanent magnet motors have a wide range of application backgrounds. At the same time, with the accelerated development of the "low-carbon economy", the promotion speed and application scope of sintered NdFeB materials in high-end fields such as wind power, inverter compressors, and hybrid power are rapidly expanding. At the same time, in recent years, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057H01F1/08C23C10/28
Inventor 竺晓东曾许多吕向科丁勇张民石高阳
Owner NINGBO YUNSHENG
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