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Sintered neodymium-iron-boron magnet and preparation method thereof

A technology of neodymium iron boron and magnets, which is applied in the fields of magnetic objects, inductors/transformers/magnets, and magnetic materials. Low cost, cost saving, and the effect of improving the intrinsic coercive force

Active Publication Date: 2013-01-30
NINGBO YUNSHENG +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reserves of heavy rare earth elements dysprosium Dy and terbium Tb are relatively small, and their prices are expensive, resulting in high production costs of sintered NdFeB magnets with high coercive force, which limits the development of related industries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: A sintered NdFeB magnet consists of the following components:

[0043] R: 29.5% (weight percentage);

[0044] Fe: 67.54% (weight percentage);

[0045] B: 0.96% (weight percentage);

[0046] TM: 2.0% (weight percentage);

[0047] Among them, R is composed of neodymium Nd, praseodymium Pr and gadolinium Gd, B represents boron, Fe represents iron, TM is composed of aluminum Al, niobium Nb, copper Cu, cobalt Co, gallium Ga and zirconium Zr; neodymium Nd and praseodymium Pr The content of Gd accounts for 85% (weight percent) of R, and the content of gadolinium Gd accounts for 15% (weight percent) of R.

Embodiment 2

[0048] Embodiment 2: A sintered NdFeB magnet consists of the following components:

[0049] R: 32.5% (weight percentage);

[0050] Fe: 64.25% (weight percentage);

[0051] B: 1.05% (weight percentage);

[0052] TM: 2.2% (weight percentage);

[0053] Among them, R is composed of neodymium Nd, praseodymium Pr and holmium Ho, B represents boron, Fe represents iron, TM is composed of aluminum Al, niobium Nb, copper Cu, cobalt Co, gallium Ga and zirconium Zr, neodymium Nd and praseodymium Pr The content of R is 85% (weight percent), and the content of holmium Ho is 15% (weight percent) of R.

Embodiment 3

[0054] Embodiment 3: A sintered NdFeB magnet consists of the following components:

[0055] R: 31% (weight percentage);

[0056] Fe: 64.9% (weight percentage);

[0057] B: 1.1% (weight percentage);

[0058] TM: 3% (weight percentage);

[0059] Among them, R consists of neodymium Nd and praseodymium Pr, B represents boron, Fe represents iron, TM consists of aluminum Al, niobium Nb, copper Cu, cobalt Co, gallium Ga and zirconium Zr.

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Abstract

The invention discloses a sintered neodymium-iron-boron magnet, comprising the following components in percent by weight: 29.5%-32.5% of R, 62.85%-67.54% of Fe, 0.96%-1.15% of B and 2.0%-3.5% of TM, wherein R consists of Nd, Pr and Gd or consists of Nd, Pr and Ho; B represents boron, Fe represents iron, and Tm is one or more in Al, Nb, Cu, Co, Ga and Zr. In addition, the invention also discloses a preparation method of the sintered neodymium-iron-boron magnet, and the sintered neodymium-iron-boron magnet is prepared by adopting a quick-curing piece technology and a forming and pre-pressing process. The invention has the advantages that the largest magnetic energy product and intrinsic coercive force of the sintered neodymium-iron-boron magnet can be furthest improved, and the produced sintered neodymium-iron-boron magnet has high residual magnetism and high coercive force and is lower in cost.

Description

technical field [0001] The invention relates to an NdFeB magnetic material, in particular to a sintered NdFeB magnet and a preparation method thereof. Background technique [0002] As the third generation rare earth permanent magnet material, NdFeB has high remanence B r , high coercive force H cJ and high maximum energy product (BH) max Features. Sintered NdFeB magnets prepared with neodymium, iron and boron as the main raw materials have been used more and more for their excellent magnetic properties, and are widely used in nuclear magnetic resonance, computers, hybrid vehicles, various motors and wind power generators and other fields. Under normal circumstances, sintered NdFeB magnets made of rare earth praseodymium Pr and neodymium Nd have low coercive force, poor resistance to reverse magnetic field and high temperature, and are easy to lose magnetism, so they can only be used in low reverse magnetic fields. and in an environment where the temperature is not too h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F7/02H01F41/02C22C38/00C22C33/02B22F3/16
Inventor 杨平达王云龙唐国才曹海良王维
Owner NINGBO YUNSHENG