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
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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 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

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Application Information

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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
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