Nanocrystalline rapid quenching rare-earth permanent magnet material, minishing method of grain size of rare-earth permanent magnet material and bonded permanent magnet

A rare earth permanent magnet and grain size technology, which is applied in the direction of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problem of intrinsic magnetic properties such as coercive force loss and anisotropy that cannot be compensated for exchange coupling. Contribution, unable to compensate for the loss of coercive force, etc., to achieve the effect of increasing the nucleation rate, increasing the residual magnetization, and increasing the remanence and coercive force

Inactive Publication Date: 2017-06-16
BEIJING ZHONG KE SAN HUAN HI TECH +1
View PDF14 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As stated in the Chinese patent application CN1210344A, the NdFeB nanocrystal refinement technology is mainly through the addition of trace high melting point alloy elements such as Ti, Zr, Si, Nb, etc. during the alloy smelting process to precipitate non-magnetic grain boundary phases during the crystallization process Inhibit grain growth, and then achieve the purpose of grain refinement. However, most of the alloying elements added are non-magnetic elements, which not only lead to the consequences of magnetic dilution, but also cannot compensate for the loss of coercive force caused

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Nanocrystalline rapid quenching rare-earth permanent magnet material, minishing method of grain size of rare-earth permanent magnet material and bonded permanent magnet
  • Nanocrystalline rapid quenching rare-earth permanent magnet material, minishing method of grain size of rare-earth permanent magnet material and bonded permanent magnet
  • Nanocrystalline rapid quenching rare-earth permanent magnet material, minishing method of grain size of rare-earth permanent magnet material and bonded permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] The nominal composition (atomic percentage) is Nd prepared by vacuum arc melting 9-x Y x Fe 72 Ti 2 Zr 2 B 15 (x = 0.5, 1.0, 2.0) pre-alloyed ingots. The surface of pre-alloyed ingots of different compositions is polished, and high-frequency remelting is performed in an argon atmosphere, and then the melt is sprayed on the high-speed rotating copper roller by using the pressure difference between the inside and outside of the tube. Surface linear speed of copper roller V s = 4m / s. The rapid quenching process is carried out under the protection of argon negative pressure. Then, the quenched belt is subjected to a vacuum heat treatment at 600° C.-800° C. for 10 min, and then water quenched and rapidly cooled to obtain a nanocrystalline permanent magnet material.

[0028] The effect of adding alloying elements on remanence: by Figure 2a , Figure 2b , Figure 2c , Figure 2d It can be seen that with the increase of Y content, the fracture microstructure is...

Example Embodiment

[0031] Example 2

[0032] The nominal composition (atomic percentage) is Nd prepared by vacuum arc melting 9-x Y x Fe 72 Ti 2 Zr 2 B 15 (x = 0.5, 1.0, 2.0) pre-alloyed ingots. The surface of the pre-alloyed ingots of different compositions is polished, and high-frequency remelting is performed in an argon atmosphere. Then, the melt is sprayed on the high-speed rotating copper roller by using the pressure difference between the inside and outside of the tube. Surface linear speed of copper roller V s = 6m / s. The rapid quenching process is carried out under the protection of argon negative pressure. Then, the quenched alloy is subjected to a vacuum heat treatment at 600°C-800°C for 10 minutes, and then water quenched and rapidly cooled to obtain a nanocrystalline permanent magnet material.

[0033] The effect of adding alloying elements on remanence: by Figure 3b , Figure 3c It can be seen that with the increase of Y content, the remanence of the heat-treated samples all show the...

Example Embodiment

[0037] Example 3

[0038] The nominal composition (atomic percentage) is Nd prepared by vacuum arc melting 11.8-x Ho x Fe 81.2 Nb 0.5 Cu 0.5 B 6.0 (x = 0.5, 1.0, 1.5, 2.0, 2.5) pre-alloyed ingots, the reverse side is smelted four times, and the protective gas during smelting is argon. Polish the surface of the pre-alloyed ingot, then put it into a quartz tube, perform high-frequency remelting in an argon atmosphere, and then use the pressure difference between the inside and outside of the tube to spray the molten liquid on the high-speed rotating copper roller. Speed ​​V s =28m / s, the quenched alloy is obtained. Then, the quenched belt is subjected to a vacuum heat treatment at 600° C.-800° C. for 10 min, and then water quenched and rapidly cooled to obtain a nanocrystalline permanent magnet material.

[0039] The effect of adding alloying elements on remanence: Figure 4a , Figure 4b , Figure 4c It also illustrates a similar problem. For different heavy rare earth elements, su...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Average grain sizeaaaaaaaaaa
Login to view more

Abstract

The invention relates to an nanocrystalline rapid quenching rare-earth permanent magnet material, a minishing method of the grain size of the rare-earth permanent magnet material and a bonded permanent magnet. According to the method, a proper amount of Y, Ho or Gd and the like is added in the alloy smelting process, the feature that the enthalpy generated by (Y, Ho, Gd)-Fe is lower than that generated by Nd-Fe14 is made used of, the grain size of the nanocrystalline rapid quenching rare-earth permanent magnet material is effectively minished, the grain size distribution is more uniform, and the exchange coupling enhancement effect brought by grain size minishing achieves the improvement of residual magnetization; at the same time, since the magnetocrystalline anisotropy field of (Y, Ho, Gd)2Fe14B is larger than 0, coercive force losses caused by the exchange coupling effect can be compensated to a certain extent. Moreover, the uniform grain size distribution and the optimized grain boundary state also contribute to the increase of coercivity.

Description

technical field [0001] The invention relates to a nano-crystal quick-quenching rare-earth permanent magnet material, a method for refining its grain size, and a bonded magnet. Background technique [0002] During the application of ferromagnets, due to the existence of its magnetic poles, the demagnetization field is inevitable, and in most cases, the demagnetization field is unevenly distributed. For each grain, if the shape is irregular, there are sharp edges or protruding parts, a large demagnetization field may appear in these parts, making the local magnetic moment distribution uneven, and even making the magnetic moment reverse. turn, resulting in reverse magnetization domains. It is very difficult to numerically calculate the demagnetization field and the resulting inhomogeneous magnetization or the formation of reverse magnetization domains due to the sharp edges or protrusions of NdFeB crystal grains with arbitrary shapes. In 1989, Gronefeld and Kronmuller studied...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01F1/057H01F41/02
Inventor 陈治安郭晓燕饶晓雷胡伯平
Owner BEIJING ZHONG KE SAN HUAN HI TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap