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A method for wet chemical preparation of rare earth permanent magnet re-fe-b powder

A rare earth permanent magnet and wet chemical technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems affecting the coercive force and density of magnets, uneven magnet performance, and the growth of magnet grains, etc., to achieve improved Magnetic properties, oxidation prevention, rare earth saving effect

Active Publication Date: 2015-09-30
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the wide distribution of particle size prepared by physical methods such as ball milling and jet milling, it is easy to have large particles, so that in the subsequent sintering process, these large particles become the nucleation center for grain growth, swallowing fine particles , so that the sintered magnet grain grows abnormally, which affects the coercive force and density of the magnet
At the same time, the magnetic powder with a wide particle size is more likely to cause uneven distribution of mass (density, specific gravity), 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. Boron magnetic coercivity and uniform performance are required to be further improved, so a new powder making method may be the key to improving the performance of magnets

Method used

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  • A method for wet chemical preparation of rare earth permanent magnet re-fe-b powder
  • A method for wet chemical preparation of rare earth permanent magnet re-fe-b powder
  • A method for wet chemical preparation of rare earth permanent magnet re-fe-b powder

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In a glove box with nitrogen protection, prepare 0.2 mmol of NdCl 3 , 0.9mmol of FeCl 2, 0.074 mmol of BCl 3 Put 2mmol of sodium oleate into the reaction kettle, pour 20ml of alcohol, 20ml of distilled water and 40ml of n-hexane into the container, shake the container to dissolve the solvent. The solution was heated to 90°C and kept at this temperature for 4 hours, and the solution separated into two layers. The upper layer is an organic complex suspension containing Nd-Fe-B oleate. Move the upper complex into a heat-resistant closed container, pump out the air in the container, and make the vacuum in the container ≤5×10 -1 Pa. The container was heated to 350°C and kept at this temperature for 6 hours. After the container was cooled to room temperature, the container was opened to obtain a black fluid. This black fluid is the suspension of Nd-Fe-B submicron particles. Clean the Nd-Fe-B particles. The cleaning method is: pour 10ml of n-hexane to disperse the Nd-Fe...

Embodiment 2

[0030] In a glove box with nitrogen protection, prepare 0.2 mmol of NdCl 3 , 1mmol of FeCl 2 , 0.08mmol of BCl 3 Put 3mmol of sodium oleate into the reaction kettle, pour a certain amount of 30ml of alcohol, 30ml of distilled water and 60ml of n-hexane into the container, shake the container to dissolve the solvent. The solution was heated to 70°C and kept at this temperature for 4 hours, and the solution separated into two layers. The upper layer is an organic complex suspension containing Nd-Fe-B oleate. Move the upper complex into a heat-resistant closed container, pump out the air in the container, and make the vacuum in the container ≤5×10 -1 Pa. The container was heated to 350°C and kept at this temperature for 4 hours. After the container was cooled to room temperature, the container was opened to obtain a black fluid. This black fluid is the suspension of Nd-Fe-B submicron particles. Clean the Nd-Fe-B particles. The cleaning method is: pour 15ml of n-hexane to d...

Embodiment 3

[0032] In a glove box with nitrogen protection, prepare 0.2 mmol of NdCl 3 , 1.1mmol of FeSO 4 , 0.085 mmol of BCl 3 Put 4mmol of sodium oleate into the reaction kettle, pour a certain amount of 40ml of alcohol, 40ml of distilled water and 80ml of n-hexane into the container, shake the container to dissolve the solvent. The solution was heated to 60°C and kept at this temperature for 4 hours, and the solution separated into two layers. The upper layer is an organic complex suspension containing Nd-Fe-B oleate. Move the upper complex into a heat-resistant closed container, pump out the air in the container, and make the vacuum in the container ≤5×10 -1 Pa. The container was heated to 350°C and kept at this temperature for 2 hours. After the container was cooled to room temperature, the container was opened to obtain a black fluid. This black fluid is the suspension of Nd-Fe-B submicron particles. Clean the Nd-Fe-B particles. The cleaning method is: disperse the Nd-Fe-B p...

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Abstract

The invention discloses a wet chemistry method for preparing rare-earth permanent-magnet RE-Fe-B powder, which belongs to the field of powder reparation of a rare-earth permanent magnet. The method is carried out under nitrogen or argon protection, and comprises the following steps of: adding precursors RE-Cl3, FeCl2 or FeSO4, BCl3 and sodium oleate into a reaction kettle, heating the precursors to 50-90 DEG C, keeping the temperature of the precursors for 2-6 hours, heating the precursors to 250-450 DEG C in a heat-resistant closed container with a vacuum degree of less than or equal to 5*10<-1>Pa, and keeping the temperature of the precursors for 1-6 hours, thus obtaining RE-Fe-B submicron particle suspension; washing the suspension to obtain clean RE-Fe-B submicron particles; and preparing the RE-Fe-B submicron particles into RE-Fe-B@SiO2 or RE-Fe-B@ surfactant particles with core-shell construction. The method can be used for preparing the rare-earth permanent magnet with ultrahigh magnetic performance and high corrosion resistance, and the rare-earth permanent magnet can be well prevented from being oxidized by virtue of protection of outer layer SiO2 or a surfactant; and the method can be used for preparing the magnetic powder with a smaller submicron size, and thus the magnetic performance of the magnet is further improved.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet powder making, in particular to a method for preparing rare earth permanent magnet RE-Fe-B powder by wet chemistry. 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 rare earth permanent magnet materials with ultra-high magnetic energy density gradually occupy more and more important roles in these fields. status. It has effectively promoted the development of modern science and technology and the information industry, and provided a guarantee of new materials for the emergence of new industries. Sintered rare earth (RE-Fe-B) permanent magnet materials mainly refer to Nd(Pr / Dy)-Fe-B materials. At present, the application fields of sintered rare earth (RE-Fe-B) permanent magnet materials mainly include new fields such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24H01F1/057H01F1/06
Inventor 裴文利
Owner NORTHEASTERN UNIV LIAONING