Anisotropic nano-crystalline composite permanent magnetic material and preparation method thereof

A nanocrystalline composite and anisotropic technology, applied in the field of material manufacturing, can solve the problems of difficulty in preparing bulk anisotropic nanocrystalline composite permanent magnet materials, poor orientation of isotropic magnets, etc., and achieve good chemical stability, Effects of low rare earth content

Active Publication Date: 2012-05-02
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome and make up for the poor orientation degree of two-phase composite nanocrystalline isotropic magnets in the prior art, and the shortcomings that it is difficult

Method used

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  • Anisotropic nano-crystalline composite permanent magnetic material and preparation method thereof
  • Anisotropic nano-crystalline composite permanent magnetic material and preparation method thereof
  • Anisotropic nano-crystalline composite permanent magnetic material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] This example is prepared from samples under laboratory conditions.

[0038] 1) The composition obtained by smelting and refining is: Nd 13.6 Fe 77.6 co 2.6 Ga 0.5 Cu 0.1 B 5.6 The Nd-Fe-B alloy ingot is prepared into a nanocrystalline magnetic powder sample by rapid quenching under an argon protective atmosphere, so that the nanocrystalline magnetic powder sample has an excellent permanent coercive force greater than 13000Oe Magnetic properties.

[0039] 2) Put the above-mentioned nanocrystalline magnetic powder sample with excellent permanent magnetic properties into a mold for hot pressing process; use induction heating to rapidly heat the mold and sample to 600°C, and then apply pressure to the sample to make the sample reach a full density of about 7.6g / cm 3 The same-sex magnet sample, then stop heating and pressurization, the sample is controlled within 5 minutes in the high temperature stage, the whole hot pressing process is completed under high vacuum, an...

Embodiment 2

[0047] This embodiment is the preparation process of the product in actual production.

[0048] 1) The composition obtained through smelting and refining is: Nd 12.2 PR 1.5 Fe 76.6 co 3.6 Ga 0.4 Cu 0.2 B 5.6 The Nd-Fe-B alloy ingot is prepared into nanocrystalline magnetic powder by rapid quenching under the protective atmosphere of argon. The coercive force of the nanocrystalline magnetic powder is detected to be 16000Oe, which has the required permanent magnetic properties.

[0049] 2) Put the above-mentioned nanocrystalline magnetic powder into a mold for hot pressing; use the current heating method to heat the mold and magnetic powder to 800°C quickly, and then apply pressure to the magnetic powder to make the magnetic powder reach a full density of about 7.6g / cm 3 Same-sex magnets, then stop heating and pressurization. During the production process, the magnetic powder is controlled within 5 minutes at the high temperature stage. The entire hot-pressing process is c...

Embodiment 3

[0057] This embodiment is the preparation process of the product in actual production.

[0058] 1) The composition obtained through smelting and refining is: Nd 10.6 Dy 3 Fe 73.6 co 6.6 Ga 0.6 B 5.6 The Nd-Fe-B alloy ingot is prepared into nanocrystalline magnetic powder by rapid quenching under the protective atmosphere of argon. The coercive force of the nanocrystalline magnetic powder is 25000Oe, which has the required permanent magnetic properties.

[0059] 2) Put the above-mentioned nanocrystalline magnetic powder into a mold for hot pressing; use the current heating method to heat the mold and magnetic powder to 700°C quickly, and then apply pressure to the magnetic powder to make the magnetic powder reach a full density of about 7.7g / cm 3 Same-sex magnets, then stop heating and pressurization. During the production process, the magnetic powder is controlled within 5 minutes at the high temperature stage. The entire hot-pressing process is completed under high vacuu...

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Abstract

The invention provides an anisotropic nano-crystalline composite permanent magnetic material and a preparation method thereof. According to the technical solution provided by the invention, a rare earth high-positive-component ingredient is prepared into an anisotropic nano-crystalline magnet through hot pressing/thermal deformation; the anisotropic nano-crystalline magnet is crushed into flaky anisotropic Nd2Fe14B crystal grains; after a rare earth enriched phase is removed, soft magnetic Fe or FeCo is coated on the surfaces of the anisotropic R2Fe14B flaky crystal grains; and then, composite particles are prepared into the full-density bulk anisotropic nano composite magnet through a hot pressing method. The nano-crystalline composite magnet obtained by the invention has high orientation; the defect of incapability of realizing high orientation due to shortage of a neodymium-enriched phase existing in the conventional low-positive-component ingredient is overcome; and the material includes a nano-scale soft and hard magnetic phase, and has high maximum magnetic energy product, high residual magnetism and high intrinsic coercive force.

Description

technical field [0001] The invention relates to the field of material manufacturing, in particular to an anisotropic nanocrystalline composite permanent magnet material and a preparation method thereof. Background technique [0002] Maximum energy product (BH) of sintered Nd-Fe-B magnet max The experimental value has reached 59.5MGOe (474kJm -3 ), approaching its theoretical limit (64MGOe), the space for further developing and improving the energy product of conventional permanent magnet materials is limited (H. Morimoto, Bulletin Topical Symposium Magnetics Soc. Jap., 147, 1 (2006)). Those skilled in the art have found through research that the composite magnet has a remanence enhancement effect, and may have a magnetic energy product higher than that of a single-phase permanent magnet material. [0003] However, there are great difficulties in the preparation of composite magnets, which are mainly due to two points: 1) how to prepare nano-sized anisotropic particles; 2) ...

Claims

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Application Information

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IPC IPC(8): H01F1/01B22F3/02
Inventor 王会杰李卫朱明刚郭朝晖潘伟李安华
Owner CENT IRON & STEEL RES INST
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