Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Partial pressure sintering method for sintering neodymium-iron-boron magnet

A sintering method, neodymium-iron-boron technology, applied in the direction of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve problems such as poor consistency of blank magnetic properties, poor sintering temperature uniformity, and fast outgassing speed. Achieve the effect of saving sintering time, good temperature consistency and reducing easy bending

Active Publication Date: 2013-03-27
宁波永久磁业有限公司
View PDF2 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. The temperature range is 500-600°C. In the medium temperature pre-burning stage, the hydrogen remaining in the hydrogen scrap is mainly removed. During this process, there is more gas release, and the gas pressure inside the blank is higher than the pressure in the external furnace, so the gas release speed is faster. Fast, easy to cause micro-cracks, internal cracks and other phenomena in the blank
This kind of conventional vacuum sintering atmosphere is not good, it is easy to cause oxidation of the blank; and the uniformity of the sintering temperature is also poor, resulting in poor consistency of the magnetic properties of the blank; in addition, the entire sintering process is time-consuming and energy-consuming

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
  • Partial pressure sintering method for sintering neodymium-iron-boron magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] According to the tempering method of the comparative example, the NdFeB blank was obtained.

[0029] Example 2

Embodiment 2

[0031] According to the tempering method of the comparative example, the NdFeB blank was obtained.

[0032] Example 3

Embodiment 3

[0034] According to the tempering method of the comparative example, the NdFeB blank was obtained.

[0035] The products obtained in the above-mentioned comparative examples and examples are tested for performance, wherein oxidation, internal cracking, and sintering bending are mainly judged by the appearance, and visual inspection is carried out for statistics; Magnetic performance tester measurement.

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 partial pressure sintering method for sintering a neodymium-iron-boron magnet. Certain inert gases Ar are filled into various deflation sections in the sintering process, the pressure of the Ar gases inside a furnace is regulated according to blank deflation velocity and vacuum pump system exhaust velocity through vacuum degree control, so that heating sintering is carried out by uniformly deflating under different partial pressures of the Ar gases, and negative pressure is still kept. The partial pressure sintering method disclosed by the invention ensures the consistency and uniformity of magnetic property and saves the sintering time.

Description

technical field [0001] The invention relates to a sintering method of a sintered NdFeB magnet. technical background [0002] Sintered NdFeB magnets have excellent magnetic properties at room temperature and are used in a wide range of fields, including electronic computers, motors and wind generators, nuclear magnetic resonance imaging devices, audio equipment, precision instruments, mineral processing, automation, aerospace and other aspects. With the application and development of high-tech fields, the requirements for the consistency of NdFeB magnets are getting higher and higher. Therefore, it is of great practical significance to develop high-consistency NdFeB magnets. Sintered NdFeB permanent magnet materials are basically used in vacuum sintering furnaces. The sintering process is carried out in a vacuum, and the heating is conducted in the form of heat radiation. Consistency is poor. [0003] Generally, there are three outgassing peaks in the process of sintering...

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): H01F41/02H01F1/057B22F3/16
Inventor 宋小明周鸿波金伟洋任荷芬任春德张伟南李建忠
Owner 宁波永久磁业有限公司
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
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