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

A high-performance sintered NdFeB rare earth permanent magnet material and its preparation method

A rare earth permanent magnet, NdFeB technology, applied in the direction of magnetic materials, inorganic material magnetism, magnetic objects, etc., can solve the problem of failing to meet the design requirements of the main phase, achieve small impact on remanence, improve coercivity, reduce The effect of boundary defects

Active Publication Date: 2017-06-13
NINGBO HUAHUI MAGNETIC IND
View PDF11 Cites 0 Cited by
  • 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

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
  • A high-performance sintered NdFeB rare earth permanent magnet material and its preparation method
  • A high-performance sintered NdFeB rare earth permanent magnet material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The first main phase magnetic powder alloy composition Nd 24 PR 6 co 1.8 Fe 61.1 Nb 0.6 al 0.30 Cu 0.2 B 1.0(mass percentage content), use the SC process to make flakes, use hydrogen explosion treatment to make the average particle size of the powder below 100 μm, and use hydrogen crushing and jet milling to make magnetic powder with an average particle size of 3.0-5.0 μm. Orientation press molding in 2T orientation magnetic field, isostatic pressing under 180MPa pressure. Sintering at 1050°C*2h, secondary heat treatment, 880°C*2h and 550°C*2h to obtain the first main phase sintered NdFeB magnet.

[0031] Alloy composition Dy of the second boundary zone structure 30 Fe 68.2 Nb 0.6 al 0.3 Cu 0.2 B 1.0 (mass percentage content), using the SC process to make flakes, using hydrogen explosion treatment to make the average particle size of the powder below 100 μm, and using hydrogen crushing and jet milling to make magnetic powder with an average particle size of...

Embodiment 2

[0037] The first main phase magnetic powder alloy composition Nd 24 PR 6 Fe 62.9 Nb 0.6 al 0.30 Cu 0.2 B 1.0 (mass percentage content), use the SC process to make flakes, use hydrogen explosion treatment to make the average particle size of the powder below 100 μm, and use hydrogen crushing and jet milling to make magnetic powder with an average particle size of 3.0-5.0 μm. Orientation press molding in 2T orientation magnetic field, isostatic pressing under 180MPa pressure. Sintering at 1050°C*2h, secondary heat treatment, 880°C*2h and 550°C*2h to obtain the first main phase sintered NdFeB magnet.

[0038] Alloy composition Dy of the second boundary zone structure 30 Fe 68.8 al 0.3 Cu 0.2 B 1.0 (mass percentage content), using the SC process to make flakes, using hydrogen explosion treatment to make the average particle size of the powder below 100 μm, and using hydrogen crushing and jet milling to make magnetic powder with an average particle size of 2.5-4.0 μm.

...

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

No PUM Login to View More

Abstract

The invention relates to a high-performance sintered NdFeB rare earth permanent magnet material and a preparation method thereof. The material includes a first magnetic powder forming a main phase, a second magnetic powder forming a boundary region and a third magnetic powder forming a grain boundary phase. The preparation method includes: mixing according to the ratio that the second magnetic powder accounts for 0.1-10% of the total weight of the material, the third magnetic powder accounts for 1-15% of the total weight of the material, and the rest is the main phase alloy magnet prepared from the first magnetic powder, and is pressed. , Isostatic pressing, vacuum sintering and heat treatment, that is. The invention improves the boundary defects formed in the sintering process and makes the heavy rare earth elements as much as the boundary area as much as possible to improve the coercive force while minimizing the influence on the residual magnetism and improving the magnetic properties of the material; when obtaining equal magnetic properties Under the premise of significantly reducing the amount of heavy rare earth, reducing the cost.

Description

technical field [0001] The invention belongs to the field of sintered NdFeB rare earth permanent magnet materials, in particular to a high-performance sintered NdFeB rare earth permanent magnet material and a preparation method thereof. Background technique [0002] Sintered NdFeB permanent magnet materials are promoting computer hard disk technology, nuclear magnetic resonance imaging technology, electric vehicles, wind power generation, industrial permanent magnet motors, consumer electronics (CD, DVD, mobile phones, audio, copiers, scanners, video cameras, cameras, refrigerators) , TV sets, air conditioners, etc.) technology and the rapid development of magnetic machinery, magnetic levitation technology, magnetic transmission technology, etc. [0003] With the continuous expansion and deepening of the application market, the requirements for sintered NdFeB permanent magnet materials are also getting higher and higher. High performance and low cost. For this reason, new ...

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 Patents(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/16
Inventor 钱勇
Owner NINGBO HUAHUI MAGNETIC IND
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