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

Cerium-containing NdFeB magnet and its heat treatment process and application

A NdFeB heat treatment technology, which is applied to the manufacture of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of the decline in the comprehensive performance of cerium-containing NdFeB magnets, so as to ensure the comprehensive magnetic properties of the magnets and reduce the cost effect

Active Publication Date: 2021-03-26
SHANGHAI JIAOTONG UNIV +2
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a cerium-containing NdFeB magnet and its heat treatment process and application, which are used to solve the problem of the decline in the comprehensive performance of the cerium-containing NdFeB magnet in the prior art

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
  • Cerium-containing NdFeB magnet and its heat treatment process and application
  • Cerium-containing NdFeB magnet and its heat treatment process and application
  • Cerium-containing NdFeB magnet and its heat treatment process and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A low-cost NdFeB magnet with high cerium content, which is prepared by sintering process with components: praseodymium neodymium (Pr-Nd): 29kg, cerium (Ce): 3kg, niobium (Nb): 0.2kg , boron (B): 1kg, aluminum (Al): 0.8kg, copper (Cu): 0.12kg, cobalt (Co): 0.2kg, iron (Fe): 65.68kg.

[0048]In the vacuum sintering furnace, firstly, the sintered NdFeB magnet is subjected to the primary tempering process, the heating rate is first 8°C / min, the temperature is raised to 590°C, the heating rate is reduced to 2°C / min, and the temperature is raised to the first-stage tempering The temperature is 645°C, the temperature is kept for 3 hours, and the vacuum degree is 0.8 Pa. After the end, the vacuum degree is filled with nitrogen and air-cooled to room temperature. Then perform secondary tempering, the heating rate is first 8°C / min, the temperature is raised to 485°C, the heating rate is reduced to 2°C / min, the temperature is raised to the secondary tempering temperature of 535°C,...

Embodiment 2

[0054] A low-cost NdFeB magnet with high cerium content, which is prepared by sintering the following components: praseodymium neodymium (Pr-Nd): 22.2kg, cerium (Ce): 8kg, dysprosium (Dy): 1.2 kg, holmium (Ho): 0.4kg, gallium (Ga): 0.2kg, niobium (Nb): 0.2kg, boron (B): 1kg, aluminum (Al): 0.4kg, copper (Cu): 0.15kg, cobalt (Co): 0.2 kg, zirconium (Zr): 0.1 kg, iron (Fe): 65.95 kg.

[0055] In the vacuum sintering furnace, firstly, the sintered NdFeB magnet is subjected to the primary tempering process, the heating rate is first 8°C / min, the temperature is raised to 590°C, the heating rate is reduced to 2°C / min, and the temperature is raised to the first-stage tempering The temperature is 640°C, the temperature is kept for 3 hours, and the vacuum degree is 0.8 Pa. After the end, the vacuum degree is filled with nitrogen and air-cooled to room temperature. Then perform secondary tempering, the heating rate is first 8°C / min, the temperature is raised to 485°C, the heating rate ...

Embodiment 3

[0061] A low-cost NdFeB magnet with high cerium content, which is prepared by sintering process from the following components: praseodymium neodymium (Pr-Nd): 21kg, cerium (Ce): 11kg, niobium (Nb): 0.2kg , boron (B): 1kg, aluminum (Al): 0.8kg, copper (Cu): 0.12kg, cobalt (Co): 0.2kg, iron (Fe): 65.68kg.

[0062] In the vacuum sintering furnace, firstly, the sintered NdFeB magnet is subjected to the primary tempering process, the heating rate is first 8°C / min, the temperature is raised to 590°C, the heating rate is reduced to 2°C / min, and the temperature is raised to the first-stage tempering The temperature is 645°C, the temperature is kept for 3 hours, and the vacuum degree is 0.8 Pa. After the end, the vacuum degree is filled with nitrogen and air-cooled to room temperature. Then perform secondary tempering, the heating rate is first 8°C / min, the temperature is raised to 485°C, the heating rate is reduced to 2°C / min, the temperature is raised to the secondary tempering tempe...

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 provides a cerium-containing neodymium-iron-boron magnet and a heat treatment processs and application thereof. The cerium-containing neodymium-iron-boron magnet comprises that followingcomponent in parts by weight: 20-32 parts by weight of praseodymium-neodymium alloy (Pr-Nd), 3-11 parts by weight of cerium (Ce), 40.65 to 76.06 parts by weight of iron (Fe), wherein the percentage content of heavy rare earth elements in the cerium-containing neodymium-iron-boron magnet is low than 3 percent, and the cerium-containing neodymium-iron-boron magnet does not contain low melting pointrare earth liquid phase alloy. The heat treatment process comprises a three-stage tempering treatment. The cerium-containing neodymium-iron-boron magnet can be used for preparing motors, the cerium-containing NdFeB magnet has excellent performance.

Description

technical field [0001] The invention relates to a cerium-containing neodymium-iron-boron magnet and its heat treatment process and application. Background technique [0002] Compared with ordinary magnets, NdFeB magnets have a very large magnetic energy product and coercive force, and are widely used in high-tech fields such as communications, medical treatment, and electronics. With the increasing market demand, the demand for NdFeB magnet raw materials has also increased sharply, so the price of praseodymium-Nd alloy is getting more and more expensive, which leads to the higher cost of sintered NdFeB. In order to reduce the cost of sintered NdFeB magnets, cerium with large reserves and low price is currently used to replace NdPr in sintered NdFeB magnets. However, the saturation magnetization and anisotropy field of the cerium-iron-boron phase are lower than those of the NdFeB phase. If a large amount of cerium is added to the NdFeB magnet, the comprehensive magnetic prop...

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): H01F1/057H01F41/02C22C38/12C22C38/06C22C38/16C22C38/10C22C38/14
CPCC22C38/002C22C38/005C22C38/06C22C38/10C22C38/12C22C38/14C22C38/16H01F1/0577H01F41/0253
Inventor 刘梅张澜庭赵文强张孙云夏贤爽
Owner SHANGHAI JIAOTONG 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