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Anisotropic nanocrystalline NdFeB magnet and its preparation method and application

An anisotropic, NdFeB technology, used in magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of corrosion resistance and fracture toughness decline, and achieve excellent magnetic density and magnetic properties. The effect of organizational structure and good magnetic properties

Active Publication Date: 2016-08-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Decreased corrosion resistance and fracture toughness

Method used

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  • Anisotropic nanocrystalline NdFeB magnet and its preparation method and application
  • Anisotropic nanocrystalline NdFeB magnet and its preparation method and application
  • Anisotropic nanocrystalline NdFeB magnet and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0049] An anisotropic nanocrystalline NdFeB magnet, the preparation method of which is as follows:

[0050] (1) Prepare NdFeB flake powder, the mass fractions of main elements are 29.2wt% Nd, 69.8wt% (FeCoAl), 1wt% B; choose a pressing mold with an inner diameter of Ф = 16mm, in the mold cavity and the upper and lower mold rods Apply the zinc stearate alcohol solution evenly, and after the alcohol evaporates, carefully put the prepared NdFeB flake powder into the mold cavity, and shake the mold to distribute the powder as evenly as possible. The amount of powder loaded is m=12.21 g;

[0051] (2) Adjust the impact energy E of the high-speed press according to the mass energy density, record the instantaneous speed at which the impact hammer impacts the upper die rod, and determine the impact energy. Adopt high-speed pressing twice, select impact energy E=320J for the first time, second time E=386J to carry out high-speed pressing; Adopt high-speed pressing once, adopt five kin...

Embodiment 2

[0054] An anisotropic nanocrystalline NdFeB magnet, the preparation method of which is as follows:

[0055] (1) Prepare NdFeB flake powder, the mass fractions of the main elements are 29.2wt% Nd, 69.8wt% (FeCoAl), 1wt% B; choose a pressing mold with an inner diameter of Ф = 12mm, in the mold cavity and the upper and lower mold rods Evenly coat the zinc stearate alcohol solution. After the alcohol evaporates, carefully put the prepared NdFeB flake powder into the mold cavity, and shake the mold to distribute the powder as evenly as possible. The amount of powder loaded is m=6.91 g; The assembly diagram of the pressing mold with inner diameter Ф = 12mm is as follows figure 1 shown;

[0056] (2) Adjust the impact energy E of the high-speed press according to the mass energy density, record the instantaneous speed at which the impact hammer impacts the upper die rod, and determine the impact energy. Adopt five kinds of impact energies of 1227J, 1500J, 1581J, 1768J and 1988J to c...

Embodiment 3

[0059] An anisotropic nanocrystalline NdFeB magnet, the preparation method of which is as follows:

[0060] (1) Prepare NdFeB flake powder, the mass fractions of the main elements are 30.2wt% Nd, 68.8wt% (FeCoAl), 1wt% B; choose a pressing mold with an inner diameter of Ф = 16mm, in the mold cavity and the upper and lower mold rods Evenly coat the zinc stearate alcohol solution. After the alcohol evaporates, carefully put the prepared NdFeB flake powder into the mold cavity, and shake the mold to distribute the powder as evenly as possible. The amount of powder loaded is m=7.69 g;

[0061] (2) Adjust the impact energy E of the high-speed press according to the mass energy density, record the instantaneous speed at which the impact hammer impacts the upper die rod, and determine the impact energy. Adopt successively three kinds of impact energies of 1191J, 1309J and 1605J to carry out high-speed pressing to the mold of step (1), then demoulding takes out the pressed sample;

...

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Abstract

The invention belongs to the field of powder metallurgy and magnet preparation, and discloses an anisotropic nanocrystalline neodymium-iron-boron magnet, a preparation method and application thereof. The preparation method comprises the following steps: densifying and molding neodymium-rich NdFeB powder by high-speed pressing to obtain a thermally deformable precursor, and then subjecting the thermally deformable precursor to thermal deformation to obtain the anisotropic nanocrystalline NdFeB boron magnet. The preparation method of the present invention has high high-speed compression molding efficiency, instantly densifies the powder, and can improve product production efficiency; the anisotropic nanocrystalline NdFeB magnet has excellent magnet density and magnetic properties, and can be applied to consumer electronics, audio, Engines, wind power, transportation, computers and high-performance automotive motors and other fields.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and magnet preparation, and in particular relates to an anisotropic nanocrystalline neodymium-iron-boron magnet and its preparation method and application. Background technique [0002] NdFeB magnets (Nd 2 Fe 14 The third-generation rare earth permanent magnet material represented by B) is the permanent magnet material with the highest magnetic performance, the widest application and the fastest development speed. Due to the advantages of high saturation magnetization, high anisotropic field and high magnetic energy product, NdFeB magnets are widely used in audio devices, automobiles, oil field wax removal, medical equipment, computers and other fields. The global demand for rare earth NdFeB permanent magnet materials is increasing year by year, with an average annual growth rate of one million tons, with great development potential and a good market situation. Although my country is a country ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057H01F1/08B22F3/02
Inventor 刘仲武邓向星肖志瑜余红雅钟喜春曾德长郑志刚王刚
Owner SOUTH CHINA UNIV OF TECH
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