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Preparation method of corrosion-resistant NdFeB magnet

A NdFeB, corrosion-resistant technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as intergranular corrosion, limited application, and large electrode potential difference

Active Publication Date: 2018-08-21
京磁材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, due to the large electrode potential difference between the main phase and the grain boundary phase, intergranular corrosion is prone to occur.
The poor corrosion resistance of sintered NdFeB magnets seriously limits its application in important fields

Method used

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  • Preparation method of corrosion-resistant NdFeB magnet
  • Preparation method of corrosion-resistant NdFeB magnet
  • Preparation method of corrosion-resistant NdFeB magnet

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Embodiment Construction

[0086] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0087] It should be understood that terms such as "having", "comprising" and "including" as used herein do not entail the presence or addition of one or more other elements or combinations thereof.

[0088] The strong magnetism of sintered NdFeB magnets comes from Nd 2 Fe 14 Phase B. Nd 2 Fe 14 B has a tetragonal structure, and the unit cell space structure is as figure 1 shown. Sintered NdFeB is a polycrystalline composite material, mainly composed of Nd 2 Fe 14 B main phase, Nd-rich grain boundary phase, there may also be a small amount of B-rich phase, Nd 2 o 3 、Nd 2 Fe 17 or a-Fe soft magnetic phase; in addition, Nd may appear in the grain boundary region of the alloyed magnet 6 Fe 13 Cu, Nd 6 Fe 13 Ga, NdCu and other alloy phases. The Nd-rich phase is a n...

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Abstract

The invention provides a method for preparing a corrosion-resistant NdFeB magnet, which includes: preparing NdFeB magnet sintered raw materials into NdFeB hydrogen explosive powder; performing jet milling on the prepared NdFeB hydrogen explosive powder The magnetic powder is obtained, and the magnetic powder is made into an NdFeB magnet, wherein the oxygen content in the airflow during the jet milling treatment is 800-900ppm, and the particle size of the NdFeB-hydrogen explosive powder is 2.9-3.1 μm. By adjusting the existing mass-produced 35K process parameters, that is, increasing the oxygen content and reducing the powder particle size, the purpose of significantly reducing the weight loss of the magnet has been achieved, and the mass loss of the magnet has been reduced from 51.56mg / cm2 to 1.77‑2.04mg / cm2. Through the exploration of different sample preparation methods, the weight loss of the magnet tends to 0mg / cm2.

Description

technical field [0001] The invention belongs to the field of neodymium-iron-boron magnets, and in particular relates to a preparation method of a corrosion-resistant neodymium-iron-boron magnet. Background technique [0002] NdFeB permanent magnet materials are divided into sintered and bonded permanent magnets according to the preparation method. The former accounts for about 85% of the total output, according to the dominant position. Sintered NdFeB is an energy storage device with high energy density, which can meet the requirements of high coercive force and high magnetic energy product, and is especially suitable for the preparation of high-performance, miniaturized and light-weight devices. Sintered NdFeB is widely used in military equipment, electroacoustic devices, motors, generators, computer hard disk drives (HDD), voice coil motors (VCM), human magnetic resonance imaging (MRI), microwave communication technology, controllers, instruments, magnetic In separation e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057B22F1/02B22F9/04C23C18/18C23C18/32
CPCH01F1/0573H01F1/0576H01F1/0577H01F41/0266C23C18/1844C23C18/32B22F9/04B22F2009/045B22F1/17
Inventor 赵媛媛杨晓霞
Owner 京磁材料科技股份有限公司