Preparation method of a sintered NdFeB magnet

A NdFeB magnet technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems that it is impossible to prepare large magnets, it is difficult to ensure the magnetic properties of NdFeB magnets, and it is difficult to grind. Achieve excellent comprehensive magnetic properties, suppress magnetization reversal process, and high intrinsic coercive force

Inactive Publication Date: 2019-04-05
NINGBO YUNSHENG +2
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the powder added by this method is relatively coarse, has good toughness, is difficult to grind, and cannot be fully and uniformly mixed with NdFeB powder, and it is difficult to ensure the magnetic properties of the final sintered NdFeB magnet, and the consistency is poor.
The Chinese patent with the application number CN201610715923 discloses a modified NdFeB magnet and its manufacturing method. In this method, one or more suspensions of light rare earth, Al, Cu and Ga are coated on the surface of the magnet, and the Diffusion of grain boundaries to prepare magnets, but this method has low efficiency and high cost, and cannot prepare large magnets; during heat treatment, these elements coated on the surface are easy to evaporate, and it is difficult to achieve good results

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  • Preparation method of a sintered NdFeB magnet
  • Preparation method of a sintered NdFeB magnet
  • Preparation method of a sintered NdFeB magnet

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Embodiment 1

[0018] Embodiment one: a kind of preparation method of sintered NdFeB magnet, comprises the following steps:

[0019] (1) According to the composition (PrNd) 30.5 Fe bal Al 0.2 Zr 0.1 Cu 0.1 B 1 (percentage by weight) is proportioned, using Pr-Nd, Fe, Co, Al, Zr, Cu and B-Fe alloys with a purity greater than 99% (percentage by weight), and intermediate frequency melting the above materials in an argon atmosphere to obtain a solution , and then the solution is cast on a water-cooled copper roller with a linear speed of 1.5m / s to prepare a neodymium-iron-boron alloy material, which is a quick-setting sheet with an average thickness of 0.28mm;

[0020] (2) Mix quick-setting flakes with low-melting-point metal materials and carry out hydrogen crushing. During the hydrogen crushing process, rotate and stir. The dehydrogenation temperature is 500-700 ° C, and the dehydrogenation time is 4 hours. The mixed alloy is coarsely crushed into a particle size of 0.5 Coarse powder part...

Embodiment 2

[0024] Embodiment 2: This embodiment is basically the same as Embodiment 1, except that in this embodiment, the low melting point metal material is 2 wt.% Ga.

Embodiment 3

[0025] Embodiment 3: This embodiment is basically the same as Embodiment 1, except that in this embodiment, the low melting point metal material is 0.5 wt.% In.

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Abstract

The invention discloses a preparation method of sintered NdFeB magnet. The method comprises the steps of: mixing a NdFeB alloy with a low melting point metal material to perform hydrogen crushing, andobtaining a sintered NdFeB magnet by powdering, forming, sintering and low temperature heat treatment. The sintered NdFeB magnet prepared by employing the method is high in coercive force and high inthe maximum magnetic energy product and excellent in the comprehensive magnetic properties, can save the amount of heavy rare earth and can reduce the cost.

Description

technical field [0001] The invention relates to a preparation technology of a sintered NdFeB magnet, in particular to a preparation method of a sintered NdFeB magnet. Background technique [0002] Sintered NdFeB magnets not only have outstanding magnetic properties, but also have the characteristics of high efficiency and energy saving, light weight, small size and good control and speed regulation. They have been widely used since they came out in 1983. At present, the NdFeB industry has become an important part of the national economic development. With the development of science and technology and the improvement of the quality of life, people have put forward higher requirements for the comprehensive performance of sintered NdFeB magnets. [0003] Coercivity and remanence are two important indicators to measure the performance of sintered NdFeB magnets. The traditional method of improving the coercive force of sintered NdFeB magnets is usually achieved by adding heavy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253H01F41/0266
Inventor 张民吕向科唐国团王昭丁勇
Owner NINGBO YUNSHENG
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