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Powder for sintered NdFeB permanent magnet material and its preparation method and application

A permanent magnet material, NdFeB technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of easy aggregation of rare earth materials, high production or purchase costs of nano-scale rare earth materials, and the improvement of NdFeB permanent magnet materials. production cost etc.

Active Publication Date: 2019-11-26
HUNAN RARE EARTH METAL MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the suspension or slurry is added to the NdFeB powder, the organic solvent in it will be quickly absorbed by the NdFeB powder, causing the rare earth substances to easily agglomerate, and the distribution of rare earth elements on the surface of the NdFeB powder is still uneven , the coercive force of the final magnet is limited
At the same time, due to the high production or purchase cost of nano-scale rare earth materials, the production cost of the above-mentioned NdFeB permanent magnet materials has also been increased.

Method used

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  • Powder for sintered NdFeB permanent magnet material and its preparation method and application
  • Powder for sintered NdFeB permanent magnet material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Take 42.03g of 6H 2 O·Dy(NO 3 ) 3 , heated in a vacuum environment at 300°C to remove the water of crystallization and obtain 32.19g of Dy(NO 3 ) 3 . To 10.8g of Dy(NO 3 ) 3 Add anhydrous acetone to Dy(NO 3 ) 3 completely dissolved.

[0058] The raw material powder of sintered NdFeB permanent magnet material is composed of the following elements by weight percentage: 2% Re, 29% A, 0.98% B, 1.2% Co, 0.15% Cu, 0.5% Al, and The amount is Fe; among them, Re is Dy, and A is PrNd. According to this, the raw materials are prepared, among which PrNd is provided by praseodymium neodymium, Fe element is provided by pure iron and boron iron, B element is provided by boron iron and so on. The raw materials are derusted and descaled. It is planned to prepare 5kg of sintered NdFeB permanent magnet material raw material powder, calculate the amount of each raw material according to the mass, and weigh each raw material separately. The weight error should be less than 1‰, a...

Embodiment 2

[0079] It is basically the same as Example 1, the difference is:

[0080] Get 1073g of Dy(NO 3 ) 3 , completely soluble in absolute ethanol. The raw material powder of sintered NdFeB permanent magnet material is composed of the following elements by weight percentage: 30.5% of A, 0.95% of B, 1% of Co, 0.1% of Ga, 0.1% of Al, 0.1% of Cu, 0.1% % of M, the balance is Fe; wherein, A is Nd, M is Cr. The raw material powder of sintered NdFeB permanent magnet material is directly obtained by hydrogen crushing of strip sheets. Immerse 5kg of sintered NdFeB permanent magnet material raw material powder in the solution, the mass ratio of sintered NdFeB permanent magnet material raw material powder to the rare earth element in the rare earth salt solution is 10:1, mix well and let stand 1.5 hours. Put the mixture of sintered NdFeB permanent magnet material raw material powder and rare earth salt solution in a vacuum drying oven, and keep the vacuum degree below 10 -1 Drying is carr...

Embodiment 3

[0084] It is basically the same as Example 1, the difference is:

[0085] Take 93.69g of Ho 2 (SO 4 ) 3 , completely soluble in absolute ethanol. The raw material powder of sintered NdFeB permanent magnet material is composed of the following elements by weight percentage: 3% Re, 28% A, 0.99% B, 2% Co, 0.2% Cu, 0.5% Al, and The amount is Fe; among them, Re is Tb, A is PrNd. Immerse 5kg of raw material powder of sintered NdFeB permanent magnet material in the solution, the mass ratio of raw material powder of sintered NdFeB permanent magnet material to the rare earth element in the rare earth salt solution is 100:1, mix well and let stand 3 hours. Put the mixture of sintered NdFeB permanent magnet material raw material powder and rare earth salt solution in a vacuum drying oven, and keep the vacuum degree below 10 -1 Drying is carried out under the conditions of Pa and temperature of 40° C. to obtain powder for sintered NdFeB permanent magnet material.

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Abstract

The invention relates to powder for a sintered neodymium-iron-boron permanent magnet material and a preparation method and application of the powder. The preparation method comprises the following steps that anhydrous rare earth salt is dissolved into an anhydrous organic solvent, and an anhydrous rare earth salt solution is obtained; the raw material powder of the sintered neodymium-iron-boron permanent magnet material is subjected to dipping treatment in the rare earth salt solution, and after drying is conducted under the vacuum condition, the powder for the sintered neodymium-iron-boron permanent magnet material is obtained. The preparation method is easy to implement, the production cost is low, rare earth elements are uniformly loaded on the surface of the powder, obtained through the preparation method, for the sintered neodymium-iron-boron permanent magnet material, the sintered neodymium-iron-boron permanent magnet material prepared from the powder for the sintered neodymium-iron-boron permanent magnet material is more uniform, higher coercive force is achieved, and residual magnetism cannot be obviously lowered.

Description

technical field [0001] The invention relates to the field of sintered NdFeB permanent magnet materials, in particular to a powder for sintered NdFeB permanent magnet materials and a preparation method and application thereof. Background technique [0002] As the third-generation rare earth permanent magnet material, NdFeB permanent magnet material was first commercialized by Sumitomo Metal of Japan and GM of the United States in 1983. Because of its characteristics of high remanence, high coercive force and high magnetic energy product, Widely used in power electronics, communications, information, transportation office automation, medical equipment and military and other fields. NdFeB permanent magnet materials are mainly composed of Nd 2 Fe 14 Composition of B main phase and Nd-rich phase, Nd 2 Fe 14 The contact interface between the grains of the B main phase is called the grain boundary, and the Nd-rich phase is distributed in a thin layer along the grain boundary, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C22C38/10C22C38/16C22C38/12C22C38/14C22C38/06C22C38/02C22C38/04C22C38/32C22C38/30C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28H01F1/057
Inventor 陈云志王志坚樊玉川刘宇晖朱望伟彭雁王川俞珺罗勉
Owner HUNAN RARE EARTH METAL MATERIAL RES INST