A kind of sintered NdFeB magnet and its preparation method

A technology of NdFeB and magnets, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of low maximum usable temperature, high production cost of magnets, uneven magnetic field, etc., and achieve low cost, The effect of reducing manufacturing costs

Active Publication Date: 2022-01-04
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, it is necessary for the present invention to provide a sintered NdFeB magnet and its preparation method. The sintered NdFeB magnet has a temperature resistance distribution, has a higher maximum usable temperature in the high temperature region, and has a higher maximum usable temperature in the low temperature region. Low maximum usable temperature, which solves the technical problems of uneven magnetic field caused by the influence of uneven temperature field on existing magnets and high production cost of magnets with good temperature resistance

Method used

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  • A kind of sintered NdFeB magnet and its preparation method
  • A kind of sintered NdFeB magnet and its preparation method
  • A kind of sintered NdFeB magnet and its preparation method

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preparation example Construction

[0028] The first aspect of the present invention discloses a preparation method of a sintered NdFeB magnet, comprising the following steps:

[0029] Prepare n kinds of NdFeB powders, n≥2, the remanence of the NdFeB powders is the same, and the maximum usable temperature is different;

[0030] Establishing a three-dimensional distribution model of the internal temperature resistance of the sintered NdFeB magnet to be prepared, and decomposing the sintered NdFeB magnet to be prepared into micro-magnets with different maximum usable temperatures in three-dimensional space according to the three-dimensional distribution model;

[0031] According to the three-dimensional distribution model, after introducing the NdFeB powder into the three-dimensional space, press molding to obtain a magnetic green body;

[0032] The magnetic green body is sintered and aged to produce a sintered NdFeB magnet with temperature resistance distribution.

[0033] Specifically, the preparation method ro...

Embodiment 1

[0044] Prepared in this example is a sintered NdFeB magnet suitable for one-dimensional gradient temperature field and one-dimensional distribution of temperature resistance. The three-dimensional size of the magnet prepared in this example is 12mm×16mm×14mm, and the 14mm side is easy Magnetization direction, the 12mm side is the direction of temperature resistance change.

[0045] Concrete preparation comprises the following steps:

[0046]Prepare NdFeB powders A, B, and C with Br= 12.0 kGs, and the highest usable temperatures are 80°C, 100°C, and 120°C respectively;

[0047] According to the characteristics of the one-dimensional gradient temperature field, a three-dimensional model of the maximum usable temperature distribution of the magnet to be prepared is established, and the magnet to be prepared is decomposed into 6×8×7=336 pieces (the three-dimensional size is 2mm×2mm×2mm) with the highest usable temperature Different micro-magnet models establish the correspondence...

Embodiment 2

[0057] According to the use environment, when the sintered NdFeB magnet is in the process of injection molding, it will be affected by the high temperature of the injection material, which will lead to a higher external temperature and a lower core temperature, showing the characteristics of "low temperature in the core and high temperature in the periphery". Therefore, In this embodiment, a temperature-resistant distributed magnet suitable for injection molding packaging is produced, and the three-dimensional size in this embodiment is 24mm×24mm×24mm.

[0058] Concrete preparation comprises the following steps:

[0059] Prepare NdFeB powders D, E, and F with Br=13.0kGs, and the highest usable temperatures are 120°C, 150°C, and 180°C respectively;

[0060] According to the characteristics of the temperature field of the magnet in the injection molding process, a three-dimensional model of the temperature resistance distribution of the magnet to be prepared is established, and ...

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Abstract

The invention discloses a sintered NdFeB magnet and a preparation method thereof. Through the three-dimensional distribution model of the internal temperature resistance of the sintered NdFeB magnet, the sintered NdFeB magnet is decomposed in a three-dimensional space, and at the same time, the same remanence, NdFeB powders with different maximum usable temperatures are directed into the three-dimensional space and pressed into shape to produce a sintered NdFeB magnet with temperature resistance distribution. The magnet has a higher maximum usable temperature in the high temperature area and a higher maximum usable temperature in the low temperature area It has a lower maximum usable temperature, and the manufacturing cost is lower than that of existing magnets with good temperature resistance.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and in particular relates to a sintered NdFeB magnet and a preparation method thereof. Background technique [0002] Magnetism is one of the basic properties of matter. Magnetic materials are ancient and widely used functional materials, including permanent magnetic materials, soft magnetic materials, magnetostrictive materials, and magnetic refrigeration materials. Among them, permanent magnet materials have been widely used in aerospace, national defense and military, magnetic transmission devices, electronic instruments, medical equipment, household appliances and many other fields, and have become the material basis for the development of machinery, power, electronic information and other industries. Its degree of development, production and application is one of the symbols of the degree of economic development of a modern country, and plays an important role in national economic and social...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F41/0266H01F1/0577
Inventor 刘友好查善顺冯泉妤陈静武衣晓飞
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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