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Method for preparing neodymium-iron-boron (Nd-Fe-B) permanent magnet

A nd-fe-b, permanent magnet technology, applied in the direction of magnetic objects, permanent magnets, inductors/transformers/magnets, etc., can solve the problems of uneven performance and uneven quality of magnets

Active Publication Date: 2012-06-13
SHENYANG GENERAL MAGNETIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the magnetic powder with a wide particle size is more likely to cause uneven mass (density, specific gravity) distribution, resulting in uneven magnet performance. The solution to the uniformity of the grain should start with the powder making process. The traditional powder making method has been unable to meet the requirements of neodymium iron. The further improvement of boron magnetic properties is required, so the development of new powder making methods is the key to continue to improve the performance of magnets

Method used

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  • Method for preparing neodymium-iron-boron (Nd-Fe-B) permanent magnet
  • Method for preparing neodymium-iron-boron (Nd-Fe-B) permanent magnet

Examples

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Embodiment 1

[0028] (1) NdCl 3 , FeCl 2 、BCl 3 Sodium oleate and sodium oleate are dissolved in a solvent at a molar ratio of 1:7:1:5. The solvent is composed of alcohol, distilled water and n-ethane in a volume ratio of 4:3:7. The solvent dosage ratio is 1 mmol NdCl 3 : 200ml of alcohol is added to make a solution, and then the solution is heated to 50°C and reacted for 2 hours. The reacted solution is divided into two layers, and the upper layer is an organic complex suspension containing Nd-Fe-B oleate ;

[0029] (2) Move the above-mentioned organic complex suspension containing Nd-Fe-B oleate into the container and then vacuumize, so that the vacuum degree in the container is 5×10 -1 Pa, heat the container to 300°C for 3 hours, air-cool to room temperature to obtain Nd-Fe-B submicron particle suspension, the submicron particle size is 80 nm;

[0030] (3) Add chloroform to the Nd-Fe-B submicron particle suspension, pour it into a centrifuge tube, then add alcohol three times the vol...

Embodiment 2

[0035] (1) NdCl 3 , FeCl2 、BCl 3 Sodium oleate is dissolved in a solvent at a molar ratio of 1:7:5:8. The solvent is composed of alcohol, distilled water and n-ethane in a volume ratio of 4:3:7. The solvent dosage ratio is 1 mmol NdCl 3 : 800ml of alcohol is added to make a solution, and then the solution is heated to 90°C and reacted for 6 hours. The reacted solution is divided into two layers, and the upper layer is an organic complex suspension containing Nd-Fe-B oleate ;

[0036] (2) Move the above-mentioned organic complex suspension containing Nd-Fe-B oleate into the container and then vacuumize, so that the vacuum degree in the container is 4×10 -1 Pa, heat the container to 400°C for 6 hours, air-cool to room temperature to obtain Nd-Fe-B submicron particle suspension, the submicron particle size is 500 nm;

[0037] (3) Add n-hexane to the Nd-Fe-B submicron particle suspension, pour it into a centrifuge tube, then add alcohol 10 times the volume of n-hexane, and cent...

Embodiment 3

[0041] (1) NdCl 3 , FeCl 2 、BCl 3 Sodium oleate is dissolved in a solvent with a molar ratio of 1:7:3:6. The solvent is composed of alcohol, distilled water and n-ethane in a volume ratio of 4:3:7. The solvent dosage ratio is 1 mmol NdCl 3 : 500ml of alcohol is added to make a solution, and then the solution is heated to 70°C and reacted for 4 hours. The reacted solution is divided into two layers, and the upper layer is an organic complex suspension containing Nd-Fe-B oleate ;

[0042] (2) Move the above-mentioned organic complex suspension containing Nd-Fe-B oleate into the container and then vacuumize, so that the vacuum degree in the container is 5×10 -1 Pa, heat the container to 350°C for 4 hours, and air-cool to room temperature to obtain a suspension of Nd-Fe-B submicron particles, the particle size of which is 200 nm;

[0043] (3) Add chloroform to the Nd-Fe-B submicron particle suspension, pour it into a centrifuge tube, then add alcohol five times the volume of c...

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Abstract

The invention relates to the technical field of permanent magnet materials, in particular to a method for preparing a neodymium-iron-boron (Nd-Fe-B) permanent magnet. The method comprises the following steps of: heating neodymium trichloride (NdCl3), iron chloride (FeCl2), boron trichloride (BCl3) and a sodium oleate solution, wherein a solution obtained after reaction has two layers, and the upper layer is an organic complex suspension of Nd-Fe-B oleate; adding chloroform or normal hexane into the suspension to make Nd-Fe-B submicron particles precipitated from liquid; adding the particles into a cyclohexane or normal hexane solution which contains Igepal-C0520 to obtain a transparent micro-emulsion; adding tetraethoxysilane and ammonia water into the micro-emulsion to obtain magnetic powder which takes Nd-Fe-B as a shell and silicon dioxide (SiO2) as a core; and sintering the magnetic powder which takes Nd-Fe-B as the shell and SiO2 as the core to obtain the Nd-Fe-B permanent magnet. A test shows that: residual magnetization (Br) is equal to 1.3 to 1.45 T, intrinsic coercive force (Hci) is equal to 12,000 to 30,000 Oe, and maximum magnetic energy product ((BH)max) is equal to 40to 50 MGOe.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to a preparation method of a Nd-Fe-B permanent magnet. Background technique [0002] With the development of modern science and technology and information industry in the direction of integration, miniaturization, ultra-miniaturization, lightweight, and intelligence, sintered Nd-Fe-B permanent magnet materials with ultra-high magnetic energy density gradually occupy more and more in these fields. increasingly important position. It effectively promotes the development of modern science and technology and information industry, and provides a material guarantee for the emergence of new industries. At present, the application fields of sintered Nd-Fe-B permanent magnet materials mainly include new fields such as electronic information, automobile industry, medical equipment, energy transportation, industrial power-saving energy motors, energy-saving and environmenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F1/057H01F41/02B22F3/16
Inventor 裴文利孙宝玉
Owner SHENYANG GENERAL MAGNETIC