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Preparation method of high-performance neodymium-iron-boron permanent magnet

A NdFeB, permanent magnet technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of easy falling off, poor performance, and poor coating adhesion.

Active Publication Date: 2017-06-27
TIANJIN SANHUAN LUCKY NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned technology is difficult to solve the poor bonding force of the coating formed by the ethanol solution, which is easy to fall off and introduces other metal impurities.
In addition, it uses fluoride or oxide, which has poor performance in material preparation

Method used

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  • Preparation method of high-performance neodymium-iron-boron permanent magnet
  • Preparation method of high-performance neodymium-iron-boron permanent magnet
  • Preparation method of high-performance neodymium-iron-boron permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Firstly, D50 900μm terbium powder and absolute ethanol are mixed according to the weight ratio of 1:5, and rod milling is carried out according to the conventional rod milling process. Filtration is carried out using a 15-micron sieve, and the filtration pressure is lower than 0.2MPA. Then the particle size is tested, and the particle size testing equipment uses Malvern 2000 wet particle size tester. Its D50 is 2.12 microns, see figure 2 , and its microstructure is shown in figure 1 , The powder is distributed in flake form. Get 1wt.% dispersant Sima Chemical CE64, add 1wt.% acrylic resin and absolute ethanol to it and mix, then add the D50 prepared above to be 2.12 micron terbium powder, after mixing by the disperser speed 2000 rev / min, under pressure Spray the sample with a specification of 35*5.2*2 under the air pressure of 0.15-0.4MPA, let it dry naturally, and the thickness of the sprayed layer is 10 microns. Then spray the other side. Among them, the samples ...

Embodiment 2

[0025] First mix D50 in 1000 micron dysprosium powder and anhydrous methanol according to the weight ratio of 1:10, and carry out rod milling according to the conventional rod milling process. Filtration is carried out using a 20-micron sieve, and the filtration pressure is lower than 0.2MPA. Then the particle size is tested, and the particle size test equipment uses Malvern 2000 wet particle size tester. Its D50 is 5.12 microns, and it is flaky. Get 15wt.% dispersant citric acid and anti-settling agent glycerin, add 1wt.% epoxy resin and anhydrous methanol to it and mix, then add D50 to be 6.2 microns terbium Powder, mixed by a disperser at a speed of 2000 rpm, sprayed on a sample with a specification of 35*5.2*2 at a pressure of 0.15-0.4MPA, dried naturally, and the thickness of the sprayed layer was 10 microns. Then spray the other side. Among them, the samples were subjected to conventional chemical degreasing and pickling and rust removal before spraying, and the sprayin...

Embodiment 3

[0031] First mix D50 dysprosium powder of 900 microns and anhydrous isopropanol according to the weight ratio of 1:8, and then carry out rod milling according to the conventional rod milling process, the speed of rod milling is 300 rpm, and then pass through a 300 mesh screen , and then filter, using a 5-micron sieve for filtration, and the filter pressure is lower than 0.2MPA. Then test the particle size, and the particle size test equipment uses Malvern 2000 wet particle size tester. Its D50 is 1.3 microns, and it is flake. Get 0.8wt.% dispersant polyethylene glycol and anti-sedimentation agent hydroxymethyl cellulose, add 0.8wt.% epoxy resin and anhydrous methanol to it and mix, Then add terbium powder with a D50 of 6.2 microns, mix through a disperser at a speed of 2000 rpm, spray a sample with a specification of 35*5.2*2 under a pressure of 0.15-0.4MPA, and let it dry naturally. The thickness of the sprayed layer is 20 microns. Then spray the other side. Among them, the ...

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Abstract

The invention provides a preparation method of a high-performance neodymium-iron-boron permanent magnet. The preparation method comprises the following steps that firstly, rare-earth metal powder and an organic solvent are mixed according to a weight ratio of 1:5 and subjected to rod milling and filtration to obtain filtered rare-earth metal powder, wherein the organic solvent is C1-C4 monohydric alcohol and / or resin, and the weight percentage of the rare-earth metal powder to the organic solvent is larger than 80%; secondly, after filtration, the filtered rare-earth metal powder is sprayed on a neodymium-iron-boron permanent magnet sample through a spraying device under the air pressure of 0.15-0.4 MPA, and the neodymium-iron-boron permanent magnet with a rare-earth metal is obtained after natural drying.

Description

technical field [0001] The invention relates to a new coating technology for improving the bonding force of the coating, and a preparation method for directly using rare earth metals to improve the performance of the NdFeB permanent magnet. Background technique [0002] In recent years, the application and development of neodymium iron boron (NdFeB) permanent magnet materials is very rapid, and the success of the protection of NdFeB permanent magnet materials is related to one of the key technologies whether the material can be popularized and applied. The material is mainly made of rare earth metals such as neodymium Nd, iron and boron through powder metallurgy process. As the strongest magnetic material at present, it has been widely used in electroplating devices, machinery, medical treatment, automobiles and other fields, and its application prospects are very broad. However, with the further increase in the price of heavy rare earth dysprosium and terbium, foreign NdFe...

Claims

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Application Information

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IPC IPC(8): H01F41/02
CPCH01F41/0253H01F41/0293
Inventor 陈风华白晓刚杜春泉
Owner TIANJIN SANHUAN LUCKY NEW MATERIAL CO LTD
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