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Preparation method of sintered neodymium-iron-boron magnet surface diffusion layer

A surface diffusion layer, neodymium iron boron technology, applied in the direction of magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of being unable to get rid of the dependence of rare earth elements, so as to improve the coercivity, ensure the diffusion effect, reduce the The effect of usage

Inactive Publication Date: 2017-02-08
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After more than ten years of research and development, although the grain boundary diffusion technology has made significant progress, it still cannot get rid of the dependence on rare earth elements. The current process requires the use of rare earth compounds or rare earth alloys to prepare the diffusion layer without exception.

Method used

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  • Preparation method of sintered neodymium-iron-boron magnet surface diffusion layer

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Cut the sintered NdFeB magnet with the brand name N35 and 33% rare earth mass percentage into a cylindrical sheet of Φ20mm×4mm; use the magnetron sputtering method to sputter the Cu-Al target with 50% Al mass percentage The power is 50W, the working pressure is 0.8Pa, the Ar gas flow is 20sccm, the time is 4.5h, and the temperature is room temperature; the surface deposition thickness is about 1 μm; -3 Pa, 1000°C for 3h, 700°C for 2h; then at 450°C, vacuum 10 -3 The surface diffusion layer of the sintered NdFeB magnet was obtained by treating for 5 hours under the condition of Pa.

[0018] From figure 1 It can be seen that the coercive force (Hcj) of the Cu-Al surface diffusion layer of the sintered NdFeB magnet has been greatly improved compared with the original sintered NdFeB magnet, from 1085kA / m to 1370kA / m (300K) , and the reduction in remanence is not obvious, from 1.20T to 1.12T (300K).

Embodiment 2

[0020] Cut the sintered NdFeB magnet with the brand name N35 and 33% rare earth mass percentage into a cylindrical sheet of Φ20mm×4mm; use the magnetron sputtering method to sputter the Cu-Zn target with 30% Zn mass percentage The power is 100W, the working pressure is 0.5Pa, the Ar gas flow is 25sccm, the time is 2h, and the temperature is room temperature; -4 Pa, 900°C for 5h, 650°C for 3h; then at 500°C, vacuum 10 -3 Treat for 2 hours under Pa condition to get the surface diffusion layer of sintered NdFeB magnet. From figure 2 It can be seen that the coercive force (Hcj) of the Cu-Zn surface diffusion layer of the sintered NdFeB magnet has been greatly improved compared with the original sintered NdFeB magnet, from 1085kA / m to 1264kA / m (300K) , and the reduction in remanence is not obvious, from 1.20T to 1.15T (300K).

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Abstract

The invention discloses a preparation method of a sintered neodymium-iron-boron magnet surface diffusion layer. The preparation method comprises the following steps: depositing a Cu-M alloy with thickness of 1-5mu m on the sintered neodymium-iron-boron magnet surface with thickness of 1-8mm by magnetron sputtering; performing heat treatment for 1-10 hours at a vacuum degree of 10<-2>-10<-4>Pa and a temperature of 800-1,100 DEG C; performing heat treatment for 1-10 hours at 550-750 DEG C; and finally, performing heat treatment for 1-5 hours at a temperature of 400-500 DEG C to obtain the sintered neodymium-iron-boron magnet surface diffusion layer. In the method disclosed by the invention, the prepared diffusion layer does not contain expensive rare earth elements, and thus the use of rare earth elements is reduced while the diffusion effect is guaranteed; and the method is simple and effective and remarkably improves the magnet coercivity on the premise of guaranteeing the remanence of the sintered neodymium-iron-boron magnet. The method disclosed by the invention is applicable to the sintered neodymium-iron-boron magnet containing 30-35% of rare earth by mass.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, and in particular relates to a method for preparing a surface diffusion layer of a sintered NdFeB magnet. Background technique [0002] Sintered neodymium iron boron (NdFeB) permanent magnet material has excellent room temperature permanent magnet properties, and has become an important basic material for the national economy and national defense industry. In the 21st century, the rapid development of electronic information, medical equipment, hybrid vehicles, wind power and other industries has put forward higher requirements for the coercivity thermal stability of sintered NdFeB magnets. More and more researchers have carried out a lot of research work to improve the permanent magnetic properties and thermal stability of sintered NdFeB. [0003] The performance of sintered NdFeB permanent magnet materials is not only the same as that of the main phase Nd 2 Fe 14 It is rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0536H01F1/057H01F41/0253
Inventor 周庆肖方明唐仁衡王英孙泰彭能刘金刚
Owner GUANGDONG INST OF RARE METALS
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