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

A technology of rare earth permanent magnets and manufacturing methods, which is applied in the fields of magnetic materials, inductance/transformer/magnet manufacturing, and the magnetism of inorganic materials, and can solve problems such as failure to meet the requirements of the main phase of the design

Active Publication Date: 2012-02-08
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 sheet and the composition of the corresponding alloy sheet. 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 significantly. 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 neodymium-iron-boron (Nd-Fe-B) rare-earth permanent magnet material and a manufacturing method thereof. The manufacturing method comprises the following steps: firstly, casting R-iron-boron-aluminum (R-Fe-B-Al) into a rapidly solidified alloy plate (R represents one and/or several of rare-earth elements containing Nd) by adopting a vacuum rapid solidifying process, then, coating a metal penetrant comprising the component Ra-Al or Ra-Al-X [the Ra represents dysprosium (Dy) and/or terbium (Tb), and the X represents one or several of cobalt, copper, gallium and zirconium (Co, Cu, Ga and Zr) elements] to the surface of the alloy plate, and heating to enable the metal penetrant to penetrate into the crystal boundary of the rapidly solidified alloy plate. A replacement reaction happens between the Ra in the penetrant entering the crystal boundary of the rapidly solidified alloy plate and the Nd and/or praseodymium (Pr) in the main phase of the alloy plate to form an Rh2(Fe, Al)14B phase with high content of the Dy and/or the Tb (the Rh represents that the content of the Dy and/or the Tb is higher than that of the Dy and/or the Tb in the R), and the positions of part of Fe atoms are replaced by Al atoms to encircle the double-main phase structure of an R2Fe14B phase. The high-performance sintered neodymium-iron-boron (Nd-Fe-B) rare-earth permanent magnet material disclosed by the invention is capable of effectively improving a coercive force and obviously reducing the use level of rare earth, and simultaneously, is also capable of improving the corrosion resistance of a 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 Applications(China)
IPC IPC(8): H01F1/057H01F1/08C23C10/30C23C10/00C23C10/60
CPCB22F2998/10C22C38/002C22C38/005C22C38/06C22C2202/02H01F1/0572H01F1/0577H01F41/0293B22F1/17B22F3/26B22F1/068
Inventor 孙宝玉王兴刚徐孝荣
Owner SHENYANG GENERAL MAGNETIC
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