A 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 problems such as complex process and expensive equipment

Active Publication Date: 2021-05-04
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • 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

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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...

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Abstract

The invention provides a method for preparing a rare earth permanent magnet material with low weight loss and high corrosion resistance, which comprises dissolving metal alkoxide in ethanol, adding a catalyst dropwise at elevated temperature, and fully stirring after the dropwise addition to obtain a metal oxide thin film spin-coating solution; Dip the micron-sized NdFeB magnet powder into the metal oxide thin film spin-coating solution, mix it evenly, and spin it at high speed with a spin coater to dry it to form a film; solidify, and re-roll the partially agglomerated magnet powder into powder; carry out Orientation pressing, and then oil-cooled isostatic pressing to make compacts; high-temperature sintering and secondary tempering heat treatment to obtain sintered magnets. The invention adopts the spin-coating film-making process to realize the ideal microstructure in which the high-potential metal oxide grain boundary phase evenly wraps the NdFeB main phase grains, and the high-potential metal elements between the main phase grains greatly reduce the contact between the main phase and the NdFeB main phase grains. The electrochemical potential difference of the grain boundary phase reduces the corrosion driving force, 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

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Application Information

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Patent Type & Authority Patents(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
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