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

Preparation method of rare-earth permanent magnet material with low weight loss and high corrosion resistance

A rare-earth permanent magnet and high corrosion-resistant technology, which is applied in the fields of magnetic materials, permanent magnet manufacturing, inductor/transformer/magnet manufacturing, etc., can solve the problems of expensive equipment and complicated process, achieve improved corrosion resistance, and realize popularization and application , reducing the effect of corrosion channels

Active Publication Date: 2018-10-16
EARTH PANDA ADVANCE MAGNETIC MATERIAL
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires high-vacuum equipment, the process is complex, and the equipment is expensive, so it is difficult to achieve large-scale promotion

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Using vacuum induction quick-setting casting technology to prepare quick-setting sheets of NdFeB master alloy, the composition of which is Nd 14.8 Dy 1.0 Fe 77.95 B 6 co 0.1 Ga 0.15 (at%).

[0037] (2) The quick-setting flakes of the master alloy are subjected to hydrogen crushing to obtain a coarse powder, which is further crushed by a jet mill to obtain a magnet powder with an average particle size of 4 μm.

[0038] (3) With metal alkoxide Al(OR) 3As a precursor, it was dissolved in ethanol solvent at a mass ratio of 4:6, and when heated to 90°C, the catalyst polyethylene glycol 600 (PEG600) was added dropwise and stirred thoroughly for 60 minutes to obtain a metal oxide thin film spin-coating solution. The catalyst and The metal alkoxide molar ratio is 3×10 -3 .

[0039] (4) Immerse the prepared magnetic powder into the film spin-coating liquid, and control the mass fraction of the magnetic powder at 40%. Then ultrasonic vibration for 90s to mix evenly, ...

Embodiment 2

[0048] (1) Using vacuum induction quick-setting casting technology to prepare quick-setting sheets of NdFeB master alloy, the composition of which is Nd 14.8 Dy 1.0 Fe 78.05 B 6 Nb 0.1 Ga 0.05 (at%).

[0049] (2) The quick-setting flakes of the master alloy are subjected to hydrogen crushing to obtain a coarse powder, which is further crushed by a jet mill to obtain a magnet powder with an average particle size of 3 μm.

[0050] (3) Metal alkoxide Ti(OR) 4 As a precursor, it was dissolved in ethanol solvent at a mass ratio of 6:4, and when heated to 85°C, the catalyst polyethylene glycol 600 (PEG600) was added dropwise and stirred thoroughly for 60 minutes to obtain a metal oxide thin film spin-coating solution. The catalyst and The metal alkoxide molar ratio is 4×10 -3 .

[0051] (4) Immerse the prepared magnetic powder into the film spin-coating liquid, and control the mass fraction of the magnetic powder at 60%. Then ultrasonically vibrate for 120s to mix evenly, a...

Embodiment 3

[0060] (1) Using vacuum induction quick-setting casting technology to prepare quick-setting sheets of NdFeB master alloy, the composition of which is Nd 14.8 Dy 1.0 Fe 77.95 B 6 Al 0.15 Ga 0.1 (at%).

[0061] (2) The quick-setting flakes of the master alloy are subjected to hydrogen crushing to obtain a coarse powder, which is further crushed by a jet mill to obtain a magnet powder with an average particle size of 4 μm.

[0062] (3) With metal alkoxide Zr(OR) 4 As a precursor, it was dissolved in ethanol solvent at a mass ratio of 3:7, and when heated to 95°C, the catalyst polyethylene glycol 600 (PEG600) was added dropwise and stirred thoroughly for 50 minutes to obtain a metal oxide thin film spin-coating solution. The catalyst and The metal alkoxide molar ratio is 6×10 -3 .

[0063] (4) Immerse the prepared magnetic powder into the film spin-coating liquid, and control the mass fraction of the magnetic powder at 30%. Then ultrasonically vibrate for 150s to mix even...

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 sizeaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of a rare-earth permanent magnet material with a low weight loss and high corrosion resistance. The method comprises the steps of dissolving a metal alkoxide into ethanol, carrying out heating, dropwise adding a catalyst, and after dropwise adding is completed, fully stirring to prepare a metal oxide film spin-coating liquid; immersing micron-scale neodymium-iron-boron magnet powder into the metal oxide film spin-coating liquid, mixing evenly and then drying to form a film by using high-speed rotation of a spin-coating machine; curing and grinding one part of agglomerated magnet powder into powder again; carrying out orientation compression and then carrying out cold isostatic pressing of oil to prepare a green compact; and carrying out high-temperature sintering and secondary tempering heat treatment to prepare a sintered magnet. According to the preparation method, an ideal microscopic structure of uniformly wrapping neodymium-iron-boron main phase grains with a high-potential metal oxide grain boundary phase is achieved by adopting a spin-coating film preparation process, an electrochemical potential difference between a main phase andthe grain boundary phase is greatly reduced through high-potential metal elements between the main phase grains, and the corrosion prime power is reduced, thereby greatly improving the corrosion resistance of the magnet.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to a preparation method of a rare earth permanent magnet material with low weight loss and high corrosion resistance. Background technique [0002] After years of development, sintered Nd-Fe-B magnet has become an indispensable material in social and economic construction and people's daily life. Its remanence and maximum energy product have reached 97% and 93% of the theoretical value respectively. However, poor corrosion resistance is still the most important limiting factor for the wide application of sintered Nd-Fe-B magnets. The sintered NdFeB magnet prepared by the powder metallurgy process has a multiphase structure. The active chemical properties of the Nd-rich phase at the grain boundary cause the magnet to be prone to chemical corrosion in a corrosive environment, and the huge potential difference between it and the main phase intensifies the magnet ele...

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): H01F41/02H01F1/057C22C33/02
CPCC22C33/0278H01F1/0577H01F41/0253H01F41/026H01F41/0266
Inventor 张浩曹玉杰吴玉程黄秀莲陈静武刘家琴衣晓飞熊永飞
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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