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

Oxygen-bearing Re-(Fe, TM)-B based sintering magnetic body and manufacturing method thereof

A technology of sintered magnets and oxygen content, which is applied in the manufacture of inductors/transformers/magnets, magnets, magnetic objects, etc., and can solve the problems of reduced corrosion resistance of magnets

Active Publication Date: 2014-05-07
SINO MAGNETICS TECH
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the oxygen content in the magnet is controlled below 2000ppm, a magnet with high magnetic performance can be obtained, but the corrosion resistance of the magnet will be reduced

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
  • Oxygen-bearing Re-(Fe, TM)-B based sintering magnetic body and manufacturing method thereof
  • Oxygen-bearing Re-(Fe, TM)-B based sintering magnetic body and manufacturing method thereof
  • Oxygen-bearing Re-(Fe, TM)-B based sintering magnetic body and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The design composition is (NdPr) 30 Fe 66.03 Al 0.1 Ga 0.5 Cu 0.1 co 1.0 Zr 0.25 B 1.02 (mass percentage, the total amount of rare earth is 31%), in order to improve the coercive force, there are two methods, one is to add 1% of pure metal Dy in the smelting process, called magnet 1; the other is Add 1% Dy2O3 powder less than 325 mesh before the jet mill after medium crushing, called magnet 2. The magnetic properties of the two alloys were measured after smelting, coarse crushing, medium crushing, jet milling, mixing, magnetic field forming, vacuum sintering, and aging treatment (test method: measure the blank with a magnetization characteristic automatic measuring instrument, standard: China National Standard of the People's Republic of China (GB / T 13650-2000) - Sintered NdFeB Permanent Magnets), Weight Loss Experimental Test and Oxygen Content Analysis. The test results are shown in Table 1:

[0020] Table 1: Magnetic properties, weight loss, and oxygen conte...

Embodiment 2

[0025] The composition is designed as (NdPr) 25.5 Dy 4.0 Fe 65.99 Al 0.2 Nb 0.5 Ga 0.4 Cu 0.15 co 1.0 Zr 0.25 B 1.01 (mass percentage) formula, in order to improve the coercive force, there are two methods, one is to add 1.0% pure metal Tb in the smelting process, called magnet 3; Add 1.0% Tb4O7 powder less than 325 meshes, lower the content of metal Nb from 0.5% to 0.1%, and increase the content of metal Fe from 65.99% to 66.34%, which is called magnet 4. The two alloys were smelted, roughly crushed, medium crushed, jet milled, mixed, formed in a magnetic field, vacuum sintered, aged, and then subjected to magnetic property measurement, weight loss test and oxygen content analysis. The test results are shown in Table 2:

[0026] Table 2: Magnetic properties, weight loss, and oxygen content tests of magnets

[0027]

[0028] Weight loss test conditions: 120 ℃, 100% humidity, 2 atmospheres of continuous storage for 96 hours; sample size: φ10*10 cylinder.

[0029]...

Embodiment 3

[0031] The composition is designed as (NdPr) 30.5 Fe 64.43 Al 0.85 Nb 0.5 Cu 0.2 co 0.75 Zr 0.25 B 1.02 (mass percentage, the total amount of rare earth is 32%), in order to improve the coercive force, there are two methods, one is to add 1.5% pure metal Nd in the smelting process, called magnet 5; the other is Add 1.5% Nd less than 325 mesh before jet mill after intermediate crushing 2 o 3 Powder, called magnet 6. The two alloys were smelted, roughly crushed, medium crushed, jet milled, mixed, formed in a magnetic field, vacuum sintered, aged, and then subjected to magnetic property measurement, weight loss test and oxygen content analysis. The test results are shown in Table 3:

[0032] Table 3: Magnetic properties, weight loss, and oxygen content tests of magnets

[0033]

[0034] Weight loss test conditions: 120 ℃, 100% humidity, 2 atmospheres of continuous storage for 96 hours; sample size: φ10*10 cylinder.

[0035] It can be seen from Table 2 that: with 1....

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 discloses a manufacturing method of an oxygen-bearing Re-(Fe, TM)-B based sintering magnetic body. The manufacturing method comprises the steps of 1 smelting and then coarsely crushing the Re-(Fe, TM)-B based magnetic body, performing secondary crushing to obtain a powder material with 0.5mm average grain diameter, wherein the Re is one or more of Pr-Nd, Nd, Dy, Tb, Gd and Ho, the TM is one or more of Al, Nb, Cu, Ga, Co and Zr; 2 adopting air-flow milling to further grind the powder material obtained in the step 1 till the grain diameter of the powder material is smaller than 5mum; 3 performing magnetic field forming, vacuum sintering and aging treatment on the powder material obtained in the step 2 to obtain a product with 2100-2900ppm oxygen content, wherein the powder material obtained in the steps 1 and 2 are mixed evenly before the next treatment, and rare earth oxide e with average grain diameter smaller than 45mum is added into the powder material when one or more of the secondary crushing, the grinding and mixing treatment is performed. The invention further provides the oxygen-bearing Re-(Fe, TM)-B based sintering magnetic body manufactured by the manufacturing method.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials. The invention mainly relates to a sintered Re-(Fe,TM)-B magnet containing oxygen, having high magnetic properties and good corrosion resistance and a manufacturing method thereof. Background technique [0002] Sintered Re-(Fe,TM)-B magnets with high magnetic properties can make magnet devices miniaturized, lightweight, and high-performance. In recent years, with the increasing demand for high-performance magnets, other properties of high-performance magnets have also attracted more and more attention, such as the corrosion resistance of magnets. Generally, uncoated magnets are usually placed continuously for a long time under high temperature, high pressure, and high humidity environmental conditions, and the weight loss per unit surface area quantitatively reflects the corrosion resistance of the magnet. [0003] At present, the dry process of manufacturing sintered Re-(Fe,...

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
IPC IPC(8): H01F41/02H01F1/057H01F1/08C22C38/00C22C33/02
CPCC22C33/02B22F2998/00C22C38/002C22C38/005C22C38/06C22C38/10C22C38/14C22C2202/00H01F1/0577H01F7/0273
Inventor 孙绪新孙斌
Owner SINO MAGNETICS TECH
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