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Efficient rare earth modified neodymium-iron-boron magnet and preparation method thereof

A technology of rare earth modification and neodymium iron boron, which is applied in the fields of magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., and can solve the problems of increasing production costs and wasting resources

Inactive Publication Date: 2021-09-10
王凯
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the production process of NdFeB, heavy rare earths are added to ensure the addition of dysprosium or terbium; however, the current process adds a large amount of heavy rare earths, which not only wastes resources, but also increases production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A high-efficiency rare earth modified NdFeB magnet, which is composed of the following raw materials in parts by weight:

[0024] Neodymium 31, Iron 80, Boron 6, Copper powder 0.1, Rare Earth Titanium Nickel Alloy 2, Adhesive 2.

[0025] The preparation method of the rare earth titanium-nickel alloy comprises the following steps:

[0026] (1) Mix triethylamine and tetrabutyl titanate, add to deionized water 20 times the weight of the mixture, and stir evenly to obtain a precursor dispersion;

[0027] (2) Mix nickel nitrate and lanthanum nitrate, add it to deionized water 30 times the weight of the mixture, stir evenly, send it into the reaction kettle, feed carbon dioxide, raise the temperature of the reaction kettle to 76°C, keep stirring for 3 hours , discharged and cooled, mixed with the above precursor dispersion, stirred and reacted for 4 hours, filtered with suction, washed with water, dried in vacuum, and calcined to obtain the product.

[0028] The vacuum dryi...

Embodiment 2

[0039] A high-efficiency rare earth modified NdFeB magnet is composed of the following raw materials in parts by weight:

[0040] 40 neodymium, 100 iron, 10 boron, 0.3 copper powder, 3 rare earth titanium-nickel alloy, 3 binder.

[0041] The preparation method of the rare earth titanium-nickel alloy comprises the following steps:

[0042] (1) Mix triethylamine and tetrabutyl titanate, add to deionized water 30 times the weight of the mixture, and stir evenly to obtain a precursor dispersion;

[0043] (2) Mix nickel nitrate and lanthanum nitrate, add it to deionized water 40 times the weight of the mixture, stir evenly, put it into the reaction kettle, feed carbon dioxide, raise the temperature of the reaction kettle to 80°C, keep stirring for 4 hours , discharged and cooled, mixed with the above precursor dispersion, stirred and reacted for 6 hours, filtered with suction, washed with water, dried in vacuum, and calcined to obtain the product.

[0044] The vacuum drying tempe...

Embodiment 3

[0055] A high-efficiency rare earth modified NdFeB magnet is composed of the following raw materials in parts by weight:

[0056] Neodymium 35, iron 87, boron 8, copper powder 0.2, rare earth titanium-nickel alloy 2.4, adhesive 2.7.

[0057] The preparation method of the rare earth titanium-nickel alloy comprises the following steps:

[0058] (1) Mix triethylamine and tetrabutyl titanate, add to deionized water 27 times the weight of the mixture, and stir evenly to obtain a precursor dispersion;

[0059](2) Mix nickel nitrate and lanthanum nitrate, add it to deionized water 36 times the weight of the mixture, stir evenly, send it into the reaction kettle, feed carbon dioxide, raise the temperature of the reaction kettle to 77°C, keep stirring for 3 hours , discharged and cooled, mixed with the above precursor dispersion, stirred and reacted for 5 hours, filtered with suction, washed with water, dried in vacuum, and calcined to obtain the product.

[0060] The vacuum drying t...

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PUM

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Abstract

The invention discloses an efficient rare earth modified neodymium-iron-boron magnet which is composed of the following raw materials in parts by weight: 31-40 parts of neodymium, 80-100 parts of iron, 6-10 parts of boron, 0.1-0.3 part of copper powder, 2-3 parts of rare earth titanium-nickel alloy and 2-3 parts of an adhesive. According to the rare earth titanium-nickel alloy added into the magnet, lanthanum nitrate and tetrabutyl titanate are adopted as a mixed precursor, the rare earth doped titanium-nickel alloy is obtained through hydrolysis, blending reaction with carbon dioxide and calcination, the alloy prepared through the method serves as an additive, the stability of rare earth can be effectively improved, and the doping stability of the rare earth in the finished magnet is enhanced.

Description

technical field [0001] The invention belongs to the field of magnets, and in particular relates to a high-efficiency rare earth modified NdFeB magnet and a preparation method thereof. Background technique [0002] NdFeB magnets have strong magnetocrystalline anisotropy and high saturation magnetization. Among permanent magnet materials, sintered Nd-Fe-B magnets have the highest performance, and the maximum magnetic energy product (BH) max=360kJ / m3 of commercial products, but the Curie temperature of this magnet is low (314 ° C), temperature stability and durability Corrosion is poor, which limits the use at higher temperatures, and in most cases requires a protective coating. The manufacturing process of NdFeB magnets includes powder metallurgy and melt rapid quenching. Due to its excellent magnetic properties, Nd-Fe-B magnets have been widely used, mainly for motors, generators, acoustic transducers, various sensors, medical equipment and magnetic machinery. At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F7/02H01F41/02
CPCH01F1/057H01F7/02H01F41/02
Inventor 王凯
Owner 王凯