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Magnetically anisotropic rare earth iron boron permanent magnet alloy submicron particles and preparation method thereof

A magnetic anisotropy, sub-micron particle technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of low particle yield, difficult to control the morphology, and reduce to less than one micron, etc. Achieve the effect of low cost and good application value

Active Publication Date: 2018-07-24
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process mostly uses ingots with a grain size of tens of microns as the raw material. Nano-submicron particles are mainly obtained through mechanical crushing with transgranular fracture as the main mechanism. The particle size distribution is very wide, and the particle output in the specified size range Low, the shape is difficult to get better control
In addition, the jet milling process widely used in the traditional sintered NdFeB field can obtain rare earth-iron-boron particles whose particle size is evenly distributed around several microns, but it is difficult to further reduce it to less than one micron

Method used

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  • Magnetically anisotropic rare earth iron boron permanent magnet alloy submicron particles and preparation method thereof
  • Magnetically anisotropic rare earth iron boron permanent magnet alloy submicron particles and preparation method thereof

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preparation example Construction

[0033] A method for preparing rare earth-iron-boron permanent magnet alloy submicron particles with magnetic anisotropy, comprising the following steps:

[0034] 1) Heat-treat the isotropic rare earth-iron-boron fast-quenching strip in an oxygen-free environment at 500°C to 900°C until the average grain size grows to 0.1-1 μm; the heat treatment time is 0.5h-10h ;

[0035] 2) Under the hydrogen pressure of 250℃~350℃ and 50kPa~500kPa, hydrogen absorption treatment is carried out; then dehydrogenation treatment is carried out at 250℃~350℃; the dehydrogenation treatment is mainly carried out by vacuuming, and the dehydrogenation treatment can remove the main phase, hydrogen in the rare earth-rich phase at the grain boundaries remains in it;

[0036] 3) Place the quenched strips obtained in step 2) in a ball milling jar with balls, add a surfactant and an organic solvent, seal the ball milling jar under the protection of an inert gas, put the ball milling jar into a ball mill for...

Embodiment 1

[0045] A method for preparing neodymium-iron-boron permanent magnet alloy submicron particles with magnetic anisotropy, comprising the following steps:

[0046] 1) Annealing the isotropic Nd-Fe-B quenched strip in an oxygen-free environment at 750°C for 1 h;

[0047] 2) At 320°C, under a hydrogen pressure of 300kPa, perform hydrogen absorption treatment; then at 320°C, vacuumize for dehydrogenation treatment;

[0048] 3) Get 10 grams of neodymium-iron-boron quick-quenching strips through the above-mentioned treatment and put them into a ball mill jar with grinding balls. The mass ratio of the strips is 10:1; add 10 grams of oleylamine and n-heptane to fill up the ball mill jar, seal the ball mill jar and put it into a planetary ball mill for ball milling. The rotation rate of the planetary ball mill is 300 rpm.

[0049] 4) After ball milling for 4h, 16h, and 24h, part of the products were taken out and ultrasonically cleaned in n-hexane for 20min, dried in a vacuum environme...

Embodiment 2

[0053] A method for preparing neodymium-iron-boron permanent magnet alloy submicron particles with magnetic anisotropy, comprising the following steps:

[0054] 1) Annealing the isotropic Nd-Fe-B quenched strip in an oxygen-free environment at 900°C for 0.5h;

[0055] 2) At 300°C, under a hydrogen pressure of 200kPa, perform hydrogen absorption treatment; then at 300°C, vacuumize for dehydrogenation treatment;

[0056] 3) Get 10 grams of neodymium-iron-boron quick-quenching strips through the above-mentioned treatment and put them into a ball mill jar with grinding balls. The mass ratio of the strips is 5:1; add 20 grams of oleic acid and absolute ethanol to fill up the ball mill jar, seal the ball mill jar and put it into a planetary ball mill for ball milling. The rotation rate of the rolling ball mill is 300 rpm.

[0057] 4) After ball milling for 8 hours, some products were taken out and ultrasonically cleaned in n-hexane for 20 minutes, dried in a vacuum environment, an...

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Abstract

The present invention relates to a rare earth-iron-boron permanent magnetic alloy submicron particle with magnetic anisotropy and a preparation method thereof. The molecular formula of the rare earth-iron-boron permanent magnetic alloy described in the present invention is: RExFey1My2Bz; wherein RE is Ce , at least one of Pr, Nd, Dy, Tb; M is at least one of Co, Cu, Al, Ga, Zr; and 26≤x≤34, 0≤y2≤10, 0.95≤z≤1.10, y1 = 100‑x‑y2‑z. Compared with the prior art, the preparation method of the present invention can effectively control the average particle size; and the manufacturing cost is low, simple and easy, and is suitable for mass production of submicron rare earth-iron-boron permanent magnets with magnetic anisotropy Alloy particles have good application value.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and in particular relates to a rare earth-iron-boron permanent magnet alloy submicron particle with magnetic anisotropy and a preparation method thereof. Background technique [0002] Magnetic energy product is one of the key technical indicators to characterize the magnetic properties of permanent magnet materials. The enhancement of magnetic energy product is crucial to the miniaturization of related devices. Anisotropic exchange-coupled nano-two-phase composite permanent magnets have the potential to be the next generation of high-performance permanent magnets due to their theoretically high magnetic energy product. Nano-two-phase composite permanent magnets have strict restrictions on the size of the soft magnetic phase, which cannot be greater than twice the thickness of the permanent magnetic phase domain wall in at least one dimension. The size of the permanent magnetic phase determines...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/06B22F9/16B22F9/04
Inventor 孟辉杜娟刘平闫阿儒刘剑陈仁杰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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