Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of high-performance sintered neodymium-iron-boron magnet

A NdFeB, high-performance technology, applied in the direction of magnetic objects, inductors/transformers/magnet manufacturing, magnetic materials, etc., can solve the problems of magnet performance degradation, neodymium-rich phase purge outflow, etc., to improve coercive force, good Economic benefits, effects of enhanced remanence and maximum energy product

Active Publication Date: 2020-06-05
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
View PDF11 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For magnets with lower rare earth content, the content of Nd-rich phase in the grain boundary area is less, and the thermal expansion gas of tens of MPa is sintered at a high sintering temperature for a long time, which will lead to the purge outflow of part of the Nd-rich phase in the grain boundary area of ​​the magnet, resulting in Degradation of magnet performance

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
  • Preparation method of high-performance sintered neodymium-iron-boron magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing a high-performance sintered NdFeB magnet, comprising the following steps:

[0032] NdFeB Alloy Micropowder (PrNd) Prepared by Vacuum Rapid Solidification and Hydrogen Breaking Process 30.1 Cu 0.2 Ga 0.2 co 0.5 al 0.2 Zr 0.2 Nb 0.1 Fe 67.7 B 0.8; Add 1.2wt% lubricant (tributyl borate), 1.2wt% antioxidant (organic esters and aviation gasoline mixture), 0.5wt% dispersant (polyethylene glycol) mixed in the prepared alloy powder Material 2h; Put the mixed raw material into jet mill powder, the average particle size is 3 μm, add 0.2wt% lubricant (tributyl borate) then, mix material 2h; The magnetic powder after the material mixing is in the magnetic field of magnetic field strength 2T Orientation in the middle, and press molding at the same time, the magnetic field direction of the magnetic field is perpendicular to the pressure direction of the press molding, and the blank after pressing is processed by cold isostatic pressing to obtain a green...

Embodiment 2

[0034] The NdFeB alloy micropowder in this Example 2 is the same as in Example 1, and the other preparation process conditions remain the same, the only difference is that the sintering temperature in the high temperature sintering process is 1050 ° C, the sintered NdFeB magnet obtained in this Example 2 Room temperature performance: remanence Br=13.9kGs, maximum energy product (BH)max=47.8MGOe, coercive force Hcj=17.8kOe.

Embodiment 3

[0045] A method for preparing a high-performance sintered NdFeB magnet, comprising the following steps:

[0046] Nd-Fe-B Alloy Micropowder Nd Prepared by Vacuum Rapid Solidification and Hydrogen Breaking Process 23.5 PR 7 Dy 0.5 Ga 0.1 co 1 Al 0.1 Zr 0. 2 Cu 0.1 Fe 66.63 B 0.97 ; Add 0.8wt% lubricant (tributyl borate), 0.75wt% antioxidant (organic esters and aviation gasoline mixture), 1.2wt% dispersant (polyethylene glycol) compound in the prepared alloy powder 3h; put the mixed fine powder into the jet mill to make powder, the average particle size is 3μm, then add 0.2wt% lubricant (tributyl borate), and mix the material for 3h; firstly apply the reverse magnetic field 2T to the magnetic powder, and then apply the positive direction Magnetic field 2T, apply reverse magnetic field 6 times, then press molding, the magnetic field direction of described magnetic field is perpendicular to the pressure direction of press molding, and the billet after pressing molding is ...

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
Remanenceaaaaaaaaaa
Maximum energy productaaaaaaaaaa
Coercivityaaaaaaaaaa
Login to View More

Abstract

A preparation method of a high-performance sintered neodymium-iron-boron magnet belongs to the technical field of rare earth permanent magnet materials and comprises the following steps: preparing single alloy or main alloy and auxiliary alloy micro powder by adopting vacuum rapid hardening melt-spinning and hydrogen decrepitation processes; adding a lubricating agent, an antioxidant and a dispersing agent, and mixing; grinding powder by airflow, adding a lubricant into magnetic powder, mixing, orienting the magnetic powder in a magnetic field, pressing and molding, and carrying out isostaticcool pressing treatment; carrying out heat preservation and deflation treatment in three temperature sections; cooling to 300-500 DEG C, introducing high-purity argon with the pressure intensity of 2-10 MPa, and carrying out hot pressing treatment; sintering at high temperature, naturally cooling to 800-900 DEG C, introducing room-temperature argon or liquid argon, and performing rapid cooling; and then carrying out two-stage heat treatment and argon rapid cooling respectively. According to the invention, the density of the final magnet is improved by improving the density before high-temperature sintering, so that the residual magnetism and the maximum magnetic energy product are enhanced. By reducing the sintering temperature, the coercive force can be obviously improved under the conditions of high residual magnetism and high magnetic energy product. The method has good economic benefits and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and in particular relates to a preparation method of a high-performance sintered NdFeB magnet. Background technique [0002] In the preparation of high-performance sintered NdFeB magnets, it is necessary to obtain high remanence Br or high maximum energy product (BH) max , improving the degree of grain orientation is a key. Generally, an appropriate amount of antioxidant, lubricant and dispersant are added to the powder before magnetic field compression molding. During the magnetic orientation process, the lubricant and dispersant are beneficial to the rotation and fluidity of the powder, and are beneficial to the magnetic powder in the orientation magnetic field. A high degree of orientation is obtained. Increasing the magnetic field intensity of the orientation magnetic field is also conducive to improving the orientation degree of the magnetic micropowder. Duri...

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): H01F1/057H01F41/02B22F3/10B22F3/14
CPCH01F1/0577H01F41/0253H01F41/0266B22F3/1007B22F3/14B22F2003/145B22F2998/10B22F1/10B22F2003/248B22F3/04B22F3/02B22F2009/044B22F9/023
Inventor 胡季帆张敏刚吴铭张克维宗朔通
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com