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

Preparation process of neodymium-iron-boron magnet

A preparation process, NdFeB technology, applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve problems such as poor reliability of product surface coatings, improve performance and use methods, and achieve the effect of wide application

Active Publication Date: 2020-12-11
宁波四环磁业有限公司
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NdFeB magnets are called "magnet kings". They have the highest remanence and magnetic energy product among all kinds of permanent magnet materials, and also have high coercive force. With the improvement of the performance of commercial NdFeB magnets, NdFeB magnets Boron devices are developing towards small size, ultra-thin, and special-shaped. The existing NdFeB cannot solve the problem of poor reliability of the surface coating of the product caused by glue coating, curing, and water glue non-conductivity in the production process. Therefore, a neodymium Iron boron process processing procedure

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 process of neodymium-iron-boron magnet
  • Preparation process of neodymium-iron-boron magnet
  • Preparation process of neodymium-iron-boron magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A preparation process of neodymium iron boron magnets, comprising:

[0052] a. Melting: After weighing the raw materials according to the ratio, put NdFeB powder, Fe3O4, calcium carbonate powder, sodium benzoate, stearic acid and iron into the melting furnace, heat up to 1500 °C, and then add carbon black and propionic acid in sequence Calcium, SiO2 and single crystal magnesium oxide, continue to heat up until all raw materials melt into liquid state, then adjust the temperature to be 2750 ℃:, keep 3-5h, obtain permanent magnet crude product solution;

[0053] b. Milling: Cool and solidify the permanent magnet rough product solution to obtain a solid rough product permanent magnet, send it into a tube mill for continuous grinding for 3 hours, and obtain a permanent magnet powder with a particle size of 0.5 microns;

[0054] c. Pressing: put the obtained permanent magnet powder into a magnetic field with a magnetic field strength of 20000Gs under the action of argon prot...

Embodiment 2

[0087] A preparation process of neodymium iron boron magnets, comprising:

[0088] a. Melting: After weighing the raw materials according to the proportion, put NdFeB powder, Fe3O4, calcium carbonate powder, sodium benzoate, stearic acid and iron into the melting furnace, raise the temperature to 1600 ° C, and then add carbon black and propionic acid in sequence Calcium, SiO2 and single crystal magnesium oxide, continue to heat up until all raw materials melt into liquid state, then adjust the temperature to 2860 ° C, keep for 5 hours, and obtain the permanent magnet crude product solution;

[0089] b. Milling: Cool and solidify the permanent magnet rough product solution to obtain a solid rough product permanent magnet, send it into a tube mill for continuous grinding for 5 hours, and obtain a permanent magnet powder with a particle size of 1 micron;

[0090] c. Pressing: put the obtained permanent magnet powder into a magnetic field with a magnetic field strength of 25000Gs un...

Embodiment 3

[0105] A preparation process of neodymium iron boron magnets, comprising:

[0106] a. Melting: After weighing the raw materials according to the ratio, put NdFeB powder, Fe3O4, calcium carbonate powder, sodium benzoate, stearic acid and iron into the melting furnace, heat up to 1550 °C, and then add carbon black and propionic acid in sequence Calcium, SiO2 and single crystal magnesium oxide, continue to heat up until all raw materials are melted into liquid, then adjust the temperature to 2800 ° C, keep for 4 hours, and obtain the permanent magnet crude product solution;

[0107] b. Milling: cooling and solidifying the permanent magnet rough product solution to obtain a solid rough product permanent magnet, and sending it into a tube mill for continuous grinding for 4 hours to obtain a permanent magnet powder with a particle size of 1 micron;

[0108] c. Pressing: put the obtained permanent magnet powder into a magnetic field with a magnetic field strength of 24000Gs under the...

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 diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation process of a neodymium-iron-boron magnet. The preparation process comprises the following steps: a, smelting: weighing raw materials in proportion, putting neodymium-iron-boron powder, Fe3O4, calcium carbonate powder, sodium benzoate, stearic acid and iron into a smelting furnace, carrying out heating to 1,500 DEG C and 1,600 DEG C, sequentially adding carbonblack, calcium propionate, SiO2 and single crystal magnesium oxide, continuing heating until all the raw materials are molten into a liquid state, adjusting a temperature to 2,750 DEG C and 2,860 DEGC, and keeping the temperature for 3-5 hours to obtain a crude permanent magnet product solution; b, powder preparation: cooling and curing the crude permanent magnet product solution to obtain a solid crude permanent magnet product, and feeding the solid crude permanent magnet product into a tube mill for continuous grinding for 3-5 hours to obtain permanent magnet powder with a particle size of0.5-1 [mu]m; c, pressing: placing the obtained permanent magnet powder in a magnetic field with a magnetic field intensity of 20,000-25,000 Gs for orientation and shaping under the action of argon shielding gas, and then carrying out pressing under a static pressure of 400 MPa to obtain a blank; d, cutting: cutting an inclined surface on the blank, and polishing the inclined surface; and e, tempering: placing the blank in a vacuum environment with a temperature of 800 DEG C to 900 DEG C for primary tempering to obtain the permanent magnet.

Description

technical field [0001] The invention belongs to the technical field of magnet preparation, and in particular relates to a preparation process of an NdFeB magnet. Background technique [0002] As the third generation of rare earth permanent magnet materials, NdFeB rare earth permanent magnet materials have been commercialized and developed by Japan's Sumitomo Metal and American GM Corporation in 1983. Due to the characteristics of high remanence, high coercive force and high magnetic energy product , are widely used in power electronics, communications, information, motors, transportation, office automation, medical equipment, military and other fields, and make the application of some small, highly integrated high-tech products possible. To meet the above market needs, we need NdFeB magnets with both high remanence and high coercivity are prepared at a lower cost. NdFeB magnets are called "magnet kings". They have the highest remanence and magnetic energy product among all ...

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): H01F41/02H01F1/057
CPCH01F1/057H01F41/0266
Inventor 吴爱军叶丽娜张基伟吴为正
Owner 宁波四环磁业有限公司
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