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

Permeation method for improving coercive force of sintered neodymium iron boron

A neodymium-iron-boron, coercive force technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of low utilization rate of heavy rare earths, difficult to penetrate magnets, poor consistency of magnets, etc., to achieve the use of heavy rare earths The effect of reducing the amount of rare earth, continuous rare earth-rich phase at the grain boundary, and increasing the coercivity

Active Publication Date: 2021-06-04
廊坊京磁精密材料有限公司
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the utilization rate of heavy rare earths attached to the surface is low, and there is a large waste
Moreover, the penetration distance is limited, the magnet consistency is poor, and it is difficult to penetrate larger magnets

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
  • Permeation method for improving coercive force of sintered neodymium iron boron
  • Permeation method for improving coercive force of sintered neodymium iron boron
  • Permeation method for improving coercive force of sintered neodymium iron boron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Step 1. Select 42H neodymium iron boron as the base material, and cast the raw material into flakes;

[0054] Step 2, the flakes in step 1 are prepared into NdFeB powder by hydrogen crushing, intermediate crushing and jet milling, the average particle size of the powder is 3.2-33 μm, and then terbium fluoride powder with an average particle size of 0.5 μm is added to make Terbium fluoride powder: the weight ratio of NdFeB powder is 0.5wt%, mixed for 4 hours using a V-type powder mixer;

[0055] Step 3. The mixed powder is oriented and pressed in a magnetic field of 1.5T, and the compacted density after pressing is 3.8g / cm 3 , sintering the pressed blank at 1030°C for 5 hours under vacuum conditions to obtain a NdFeB blank;

[0056] Step 4, ultrasonically dispersing 100 g of boron oxide powder and 1 g of polyvinylpyrrolidone in ethanol, wherein the size of the boron oxide powder is 1.2 μm;

[0057] Step 5. Process the NdFeB blank into a 50*30*4mm magnet substrate, then...

Embodiment 2

[0063] Step 1. Select 42H neodymium iron boron as the base material, and cast the raw material into flakes;

[0064] Step 2, the flakes in step 1 are prepared into NdFeB powder by hydrogen crushing, medium crushing and jet milling, the average particle size of the powder is 3.2-33 μm, and then dysprosium fluoride powder with an average particle size of 0.5 μm is added to make Dysprosium fluoride powder: the weight ratio of neodymium iron boron powder is 0.5wt%, mixed for 4 hours using a V-type powder mixer;

[0065] Step 3. The mixed powder is oriented and pressed in a magnetic field of 1.5T, and the compacted density after pressing is 3.8g / cm 3 , sintering the pressed blank at 1030°C for 5 hours under vacuum conditions to obtain a NdFeB blank;

[0066] Step 4, ultrasonically dispersing 100 g of boron oxide powder and 1 g of polyvinylpyrrolidone in propanol, wherein the size of the boron oxide powder is 2 μm;

[0067] Step 5. Process the NdFeB blank into a 50*30*4mm magnet s...

Embodiment 3

[0073] Step 1. Select NdFeB with the brand name of 52H as the base material, and pour the raw material into flakes;

[0074] Step 2, the flakes in step 1 are prepared into NdFeB powder by hydrogen crushing, intermediate crushing and jet milling, the average particle size of the powder is 3.2-33 μm, and then terbium fluoride powder with an average particle size of 0.5 μm is added to make Terbium fluoride powder: the weight ratio of NdFeB powder is 0.5wt%, mixed for 4 hours using a V-type powder mixer;

[0075] Step 3. The mixed powder is oriented and pressed in a magnetic field of 1.5T, and the compacted density after pressing is 3.8g / cm 3 , sintering the pressed blank at 1070°C for 5 hours under vacuum conditions to obtain a NdFeB blank;

[0076] Step 4, ultrasonic dispersion of 100g of lithium carbonate powder and 1g of polyvinylpyrrolidone in ethanol, wherein the size of lithium carbonate powder is 1.2 μm;

[0077] Step 5. Process the NdFeB blank into a 50*30*4mm magnet su...

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
densityaaaaaaaaaa
sizeaaaaaaaaaa
sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a permeation method for improving the coercive force of sintered neodymium iron boron, and the method comprises the following steps: 1, uniformly mixing neodymium iron boron powder with heavy rare earth powder, and preparing the mixed powder into a neodymium iron boron blank magnet; 2, processing the obtained neodymium-iron-boron blank magnet into a magnet base material with a preset size; 3, coating the surface of the magnet base material obtained in the step 2 with a fluxing agent dispersion liquid; 4, carrying out secondary tempering treatment on the magnet base material coated with the fluxing agent dispersion liquid in a vacuum sintering furnace. According to the method, the infiltration capacity of the heavy rare earth can be improved, so the coercive force of the magnet is improved, and the influence on residual magnetism is very small.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials. More specifically, the present invention relates to an infiltration method for increasing the coercive force of sintered NdFeB. Background technique [0002] Sintered NdFeB magnets have been widely used in consumer electronics, medical equipment, aerospace, information and other fields due to their high remanence and coercive force. Their high magnetic energy products make some small, highly integrated The application of high-tech products becomes possible. With the development of clean energy technology, especially in the field of new energy vehicles and permanent magnet motors, the demand for NdFeB has increased dramatically. However, in these fields, NdFeB magnets need to work at higher temperatures. However, NdFeB magnets have poor thermal stability, which puts forward higher requirements for the coercive force of the magnets. [0003] Improving the coercive f...

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): H01F41/02
CPCH01F41/0266H01F41/0293
Inventor 马明国姜华刘永广
Owner 廊坊京磁精密材料有限公司
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