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A kind of high coercive force sintered NdFeB magnet and its preparation method

A high coercive force, neodymium iron boron technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of increased strength requirements, inability to meet high strength, high corrosion, etc., to achieve improved Coercive force, the effect of improving the coercive force of magnets and improving wettability

Active Publication Date: 2018-08-17
宁波元辰新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] NdFeB permanent magnet is a kind of NdFeB magnetic material, also known as the latest result of the development of rare earth permanent magnet materials. It is called "Magnetic King" because of its excellent magnetic properties. With the rapid development of industry, it is The strength requirements of some materials are increased, and the traditional NdFeB manufacturing process can no longer meet the required effects in high-strength, highly corrosive environments.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing a high-coercivity sintered NdFeB magnet, comprising the steps of:

[0027] (1) Silane coupling agent Si-69 and nano silicon dioxide were mixed in ethanol solution with a ratio of 1:5 for 60 min, and the heating temperature was 60° C. to obtain modified nano silicon dioxide;

[0028] (2) Use a 10kg vacuum induction furnace to melt NdFeB alloy, and simultaneously melt Mg and Al metal (accounting for 1% of NdFeB alloy), then break the ingot, and soak the broken NdFeB alloy in the modified After 24 hours in the nano-silica solution, dry it. Then, under the protection of argon, the melt overflow method was used to prepare the rapidly quenched strip sample;

[0029] (3) Add the crushed Mg and Al to the NdFeB alloy sample under the protection of argon, and after uniform mixing, go through hydrogen crushing and jet milling to make magnetic powder with an average particle size of 3-5 μm;

[0030] (4) Crystallize the magnetic powder sample in a vacuum dyn...

Embodiment 2

[0033] A method for preparing a high-coercivity sintered NdFeB magnet, comprising the steps of:

[0034] (1) Silane coupling agent Si-69 and nano silicon dioxide were mixed in ethanol solution with a ratio of 1:10 for 60min, and the heating temperature was 60°C to obtain modified nano silicon dioxide;

[0035] (2) Use a 10kg vacuum induction furnace to melt NdFeB alloy, and simultaneously melt Mg and Al metal (accounting for 1% of NdFeB alloy), then break the ingot, and soak the broken NdFeB alloy in the modified After 24 hours in the nano-silica solution, dry it. Then, under the protection of argon, the melt overflow method was used to prepare the rapidly quenched strip sample;

[0036] (3) Add the crushed Mg and Al to the NdFeB alloy sample under the protection of argon, and after uniform mixing, go through hydrogen crushing and jet milling to make magnetic powder with an average particle size of 3-5 μm;

[0037] (4) Crystallize the magnetic powder sample in a vacuum dynam...

Embodiment 3

[0040] A method for preparing a high-coercivity sintered NdFeB magnet, comprising the steps of:

[0041] (1) Silane coupling agent Si-69 and nano silicon dioxide were mixed in ethanol solution with a ratio of 1:20 for 60min, and the heating temperature was 60°C to obtain modified nano silicon dioxide;

[0042] (2) Use a 10kg vacuum induction furnace to smelt NdFeB alloy, and simultaneously smelt Mg and Al metals (accounting for 0.1% of the NdFeB alloy), then break the ingot, and soak the broken NdFeB alloy in the modified After 24 hours in the nano-silica solution, dry it. Then, under the protection of argon, the melt overflow method was used to prepare the rapidly quenched strip sample;

[0043] (3) Add the crushed Mg and Al to the NdFeB alloy sample under the protection of argon, and after uniform mixing, go through hydrogen crushing and jet milling to make magnetic powder with an average particle size of 3-5 μm;

[0044] (4) Crystallize the magnetic powder sample in a hea...

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Abstract

The invention provides a high-coercivity sintered neodymium-iron-boron magnet and a preparation method thereof. The magnet comprises following raw materials: neodymium-iron-boron alloy, magnesium, aluminum, silane coupling agent and nanosilicon dioxide. The magnesium and aluminum make up 1% of the neodymium-iron-boron alloy; the mass ratio of silane coupling agent and nanosilicon dioxide is 1:5 to 20; by means of the dynamic crystallization manufacture technology, samples can be heated quickly to the phase transition point and insulated for short time and cooled quickly; under the premise that the samples are uniformly heated, the crystal grains are finer and the coercive force of magnet is increased.

Description

technical field [0001] The invention relates to the field of permanent magnet materials, in particular to a sintered NdFeB magnet with high coercive force and a preparation method thereof. Background technique [0002] As the third-generation permanent magnet material, NdFeB has been widely used in microwave technology, audio-visual technology, electrical engineering, instrument technology, computer technology, magnetic separation technology, automobile industry and other fields due to its excellent magnetic properties and low price. With the thawing of sintered NdFeB patented technologies in Japan, Germany, and the European Union, and the concerted efforts of major sintering manufacturers in my country, the grade of sintered NdFeB products has also been greatly improved. At the same time, with the further promotion of NdFeB as a high-tech application field, the comprehensive performance requirements of its products are also continuously increasing, especially its strength r...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0573H01F1/0576H01F41/0266
Inventor 贝振军
Owner 宁波元辰新材料有限公司
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