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

Preparation method of sintered rare-earth iron-boron permanent magnet material for regulating and controlling grain boundary

A technology of rare earth iron boron and permanent magnet materials, which is applied in the direction of magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve the problem of reducing remanence, grain boundary composition or tissue influence and limited regulation, and magnet coercive force Solve problems such as limited improvement of force and strength, achieve the effect of increasing adsorption strength, eliminating the possibility of oxidation, and reducing the distribution range

Active Publication Date: 2020-04-17
JIANGXI NORMAL UNIV
View PDF11 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when doping elements are added from the smelting stage, most of the doping elements inevitably enter the main phase grains, and only a small part enters the grain boundary. Although it can improve its coercive force and mechanical properties, there are two problems: on the one hand, it reduces remanence; on the other hand, the impact and regulation on the grain boundary composition or structure is limited
Therefore, the coercive force and force of the magnet can be limited by doping certain metal elements.

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 sintered rare-earth iron-boron permanent magnet material for regulating and controlling grain boundary
  • Preparation method of sintered rare-earth iron-boron permanent magnet material for regulating and controlling grain boundary
  • Preparation method of sintered rare-earth iron-boron permanent magnet material for regulating and controlling grain boundary

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Change the nominal component to Nd 18.5 Pr 5.5 Gd 2 Ce 5 Nb 0.1 Zr 0.1 Fe 67.8 B 1 After hydrogen explosion and jet milling process, the alloy thick belt is made into magnetic powder with an average particle size of about 3 microns; Al nano-powder is prepared by high-voltage arc evaporation-condensation technology; nano-suspension is prepared using absolute ethanol, and the magnetic powder is added to the suspension Mix the liquid and stir, pour out the excess liquid, vacuum and air dry, and use an ultrasonic vibrator to process the air-dried powder to restore its flow properties. The doped Al concentration is 0.49wt%, and the sintering and heat treatment processes are respectively: temperature 1050°C, time 2.5hr; temperature 900°C, time 2hr; temperature 500°C, time 2hr. The product prepared in this example is called sample 1.

Embodiment 2

[0044] The doping process is the same as in Example 1, the doped Al concentration is 0.86 wt%, and the sintering and heat treatment processes are respectively: temperature 1050°C, time 2.5hr; temperature 900°C, time 2hr; temperature 500°C, time 2hr. The product prepared in this example is called sample 2.

Embodiment 3

[0046] The doping process is the same as in Example 1, the doped Al concentration is 1.15 wt%, and the sintering and heat treatment processes are respectively: temperature 1050°C, time 2.5hr; temperature 900°C, time 2hr; temperature 500°C, time 2hr. The product prepared in this example is called sample 3.

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
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of a sintered rare-earth iron-boron permanent magnet material for regulating and controlling a grain boundary, and belongs to the field of magnetic materials. The method comprises the following main steps: 1, preparing magnetic powder by using a conventional method for sintering neodymium iron boron, wherein doped metal is not added at the stage; 2, preparing metal (or alloy)-doped metal fine powder (nano powder or micro powder); 3, preparing turbid liquid by utilizing metal fine powder and a volatile organic solvent in an inert atmosphere, adding magnetic powder into the solution, immersing, stirring, standing, vacuumizing and evaporating, and recovering the flowability of the coated magnetic powder by utilizing ultrasonic vibration; and 4, carrying out orientation, sintering and heat treatment on the coated magnetic powder.

Description

Technical field [0001] The invention relates to a method for preparing a sintered rare earth iron boron permanent magnet material, and belongs to the technical field of magnetic materials. Background technique [0002] Sintered NdFeB permanent magnet materials are the strongest permanent magnet materials available today, and are widely used in computer, electronics, communications, automobiles, electromechanical and other fields. Sintered NdFeB material has excellent intrinsic magnetic properties, but as a magnet, there are some limitations, and technological innovation is needed to improve and optimize its performance. [0003] The existing sintered NdFeB permanent magnet materials have some typical problems, which affect the realization and better use of their excellent performance, such as: 1. The coercivity is much lower than its theoretical value, which affects the magnetic performance and uses at higher temperatures. ; 2. Poor mechanical properties, easy to brittle, affect t...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266
Inventor 王公平吴双
Owner JIANGXI NORMAL UNIV
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