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High-performance sintered neodymium-iron-boron (Nd-Fe-B) rare-earth permanent magnet material and manufacturing method thereof

A rare earth permanent magnet and manufacturing method technology, applied in magnetic materials, inductance/transformer/magnet manufacturing, inorganic material magnetism, etc., can solve problems such as failure to meet the design requirements of the main phase

Active Publication Date: 2014-07-23
SHENYANG GENERAL MAGNETIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the rare earth is reduced, it is easy to form α-iron, which cannot meet the main phase requirements of the design

Method used

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  • High-performance sintered neodymium-iron-boron (Nd-Fe-B) rare-earth permanent magnet material and manufacturing method thereof
  • High-performance sintered neodymium-iron-boron (Nd-Fe-B) rare-earth permanent magnet material and manufacturing method thereof
  • High-performance sintered neodymium-iron-boron (Nd-Fe-B) rare-earth permanent magnet material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Ra-Al metal infiltrant, that is, without Co, Cu, Ga, Zr. Compared with the prior art (comparative example), with the increase of the metal infiltrant, the magnetic properties of the magnet increase, especially the coercive force increases significantly; in the metal infiltrant, when Dy is replaced by Tb, the coercive force increases even more obvious. Table 1 shows the composition of the metal infiltrant, the content of the metal infiltrant in the corresponding alloy flakes and the composition of the corresponding alloy flakes. Table 2 is the magnetic properties and corrosion resistance corresponding to the numbers in Table 1. Wherein the number B00 is a comparative example of the prior art.

[0029] Table 1:

[0030]

[0031] Note: wt% means weight percentage

[0032] Table 2

[0033]

Embodiment 2

[0035] When X in the Ra-Al-X metal infiltrant is Co, the magnetic performance of the magnet increases with the increase of the metal infiltrant, but the weight loss decreases obviously. The composition of the metal infiltrant and the alloy sheet, and the infiltration amount parameters of the metal infiltrant in the alloy sheet are listed in Table 3; the corresponding properties are listed in Table 4.

[0036] table 3:

[0037]

[0038] Note: wt% means weight percentage

[0039] Table 4

[0040]

Embodiment 3

[0042] When X in the Ra-Al-X metal infiltrant is Co or Cu, it can be seen from Table 5 and Table 6 that with the increase of the metal infiltrant, the magnetic properties of the magnet are improved, but the weight loss is significantly reduced.

[0043] table 5:

[0044]

[0045]

[0046] Note: wt% means weight percentage

[0047] Table 6

[0048]

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Abstract

The invention discloses a high-performance sintered NdFeB rare-earth permanent magnet material and a manufacturing method. Firstly, the vacuum quick-setting process is adopted to melt and cast the R-Fe-B-Al into quick-setting alloy flakes (where R stands for containing Nd One and / or more of rare earth elements), and then the composition is Ra-Al or Ra-Al-X (where Ra represents Dy and / or Tb; X represents one of Co, Cu, Ga, Zr elements One or more) metal infiltrants are applied to the surface of the alloy flakes, heated to infiltrate into the grain boundaries of the quick-setting alloy flakes. The Ra in the infiltrant that enters the grain boundary of the quick-setting alloy sheet has a substitution reaction with the Nd and / or Pr in the main phase of the alloy sheet to form a Rh2(Fe,Al)14B phase with a high content of Dy and / or Tb ( Here Rh represents that the content of Dy and / or Tb is higher than the content of Dy and / or Tb in R; the position of part Fe atom is replaced by Al atom) surrounds the dual main phase structure of R2Fe14B phase, the present invention can effectively improve coercive force , Significantly reduce the amount of heavy rare earth, but also improve the corrosion resistance of the magnet.

Description

technical field [0001] The invention belongs to the field of permanent magnet materials, in particular to a high-performance sintered NdFeB rare earth permanent magnet material and its manufacturing method Background technique [0002] NdFeB rare earth permanent magnet material, since its inception, has been used more and more for its excellent magnetic properties, and is widely used in medical nuclear magnetic resonance imaging, computer hard drives, audio, mobile phones, etc.; In response to the requirements of the carbon economy, NdFeB rare earth permanent magnet materials have begun to be used in automotive appliances, household appliances, energy-saving motors, hybrid electric vehicle motors, wind power generators and other fields. [0003] In 1982, Japan's Sumitomo Special Metals Corporation first disclosed the Japanese patent 1,622,492 of NdFeB, which first revealed the existence of a new NdFeB compound with extremely high magnetic properties. Its composition is R-Fe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08C23C10/30C23C10/00C23C10/60
CPCC22C38/005H01F1/0577H01F1/0572B22F2998/10C22C38/06C22C38/002C22C2202/02H01F41/0293B22F1/17B22F3/26B22F1/068
Inventor 孙宝玉王兴刚徐孝荣
Owner SHENYANG GENERAL MAGNETIC