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Preparation method of high-performance Nd2Fe14B magnet material

A nd2fe14b, high-performance technology, applied in the manufacture of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of high cost, small maximum energy product, complex preparation process, etc., and achieve low cost and large coercive force , The effect of simple process

Pending Publication Date: 2022-05-31
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The preparation process of NdFeB magnets in the prior art is complicated, the cost

Method used

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  • Preparation method of high-performance Nd2Fe14B magnet material
  • Preparation method of high-performance Nd2Fe14B magnet material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: as figure 1 Shown, the preparation method of a kind of high-performance Nd2Fe14B magnet material of the present invention, concrete steps are as follows:

[0027] S1, batching stage: according to the mass ratio: Nd:Fe:B=30:69:1, weigh the permanent magnet raw material powder, add the BiI3 powder with a mass fraction of 1% of the magnet powder, after fully grinding and mixing, put the powder in the Under the pressure of 16Mpa, it is pressed into a NdFeB green body with a diameter of 20mm and a thickness of 4mm;

[0028] S2. Pre-burning stage: Pre-fire the NdFeB green body at a vacuum degree of 10-4Pa. The first stage temperature is 600°C for 3 hours. The second stage pre-fires at 1080°C for 5 hours to form an internal A magnet with a network channel structure;

[0029] S3. Coating stage: add a certain amount of Dy powder into the ethanol solvent to form a mixed solution, immerse the pre-fired NdFeB magnet into the mixed solution, take it out and put it in...

Embodiment 2

[0032] Embodiment 2: as figure 1 Shown, the preparation method of a kind of high-performance Nd2Fe14B magnet material of the present invention, concrete steps are as follows:

[0033] S1, batching stage: according to the mass ratio: Nd:Fe:B=29:70:1, weigh the permanent magnet raw material powder, add the BiI3 powder with a mass fraction of 1.5% of the magnet powder, after fully grinding and mixing, put the powder in the Under the pressure of 18Mpa, it is pressed into a NdFeB green body with a diameter of 18mm and a thickness of 5mm;

[0034] S2. Pre-burning stage: The NdFeB body is pre-fired at a vacuum of 10-4Pa. The first stage temperature is 590°C for 4 hours. The second stage pre-fires at 1050°C for 6 hours to form an internal A magnet with a network channel structure;

[0035] S3. Coating stage: add a certain amount of Tb powder into the ethanol solvent to form a mixed solution, immerse the pre-fired NdFeB magnet into the mixed solution, take it out and put it in a vacu...

Embodiment 3

[0038] Embodiment 3: as figure 1 Shown, the preparation method of a kind of high-performance Nd2Fe14B magnet material of the present invention, concrete steps are as follows:

[0039] S1, batching stage: according to the mass ratio: Nd:Fe:B=32:67:1, weigh the raw material powder of the permanent magnet, add the BiI3 powder whose mass fraction is 2% of the magnet powder, after fully grinding and mixing, put the powder in the Under the pressure of 20Mpa, it is pressed into a NdFeB green body with a diameter of 20mm and a thickness of 4mm;

[0040] S2. Pre-burning stage: Pre-fire the NdFeB green body at a vacuum degree of 2*10-4Pa. The first stage temperature is 595°C for 3 hours. The second stage pre-fires at 1080°C for 6 hours. Form a magnet with a network channel structure inside;

[0041] S3. Coating stage: add a certain amount of CaF2 into the acetone solvent to form a mixed solution, immerse the pre-fired NdFeB magnet into the mixed solution, take it out and put it in a v...

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Abstract

The invention discloses a preparation method of a high-performance Nd2Fe14B magnet material. The preparation method comprises the following steps: S1, a burdening stage; s2, a pre-sintering stage; s3, a coating stage; s4, a sintering diffusion stage; the preparation method comprises the following steps: weighing raw material powder of a permanent magnet material according to a certain stoichiometric ratio, adding a proper amount of BiI3, fully grinding and mixing, pressing the raw material powder into a neodymium iron boron green body, and pre-sintering under a certain condition to form a magnet with a net-shaped channel structure inside. Dy and Tb elements or metal fluoride are added and dissolved in an organic solvent to form a diffusion solution, neodymium iron boron is immersed in the mixed solution to form a neodymium iron boron magnet coated with the Dy, Tb and metal fluoride, and the permanent magnet material with excellent performance is obtained through sintering and heat preservation treatment. The preparation method is simple in process and low in cost, the coercive force of the obtained magnet is larger, the maximum magnetic energy product is larger, and the magnetic performance is remarkably improved.

Description

technical field [0001] The invention relates to the field of permanent magnet materials, in particular to a preparation method of a high-performance Nd2Fe14B magnet material. Background technique [0002] NdFeB magnets are the most magnetic materials so far, widely used in various fields, such as energy, transportation, machinery, aerospace, etc. NdFeB magnets have good market prospects; [0003] The preparation process of the NdFeB magnets in the prior art is complicated, the cost is high, and the obtained magnets have low coercive force and small maximum energy product. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a method for preparing a high-performance Nd2Fe14B magnet material, so as to solve the technical problems mentioned in the above-mentioned background technology. [0005] The preparation method of the high-performance Nd2Fe14B magnet material of the present invention is realized through the follow...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057
CPCH01F41/0253H01F41/0266H01F41/0293H01F1/0576H01F1/0577
Inventor 杨杭福李凌峰申屠航张方远黄开敏李宇航吴琼葛洪良
Owner CHINA JILIANG UNIV
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