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Preparation method of sintered neodymium-iron-boron magnet with high magnetic energy product and high coercivity

A technology with high coercive force and high magnetic energy product, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc. It can solve the problems of poor consistency of magnetic properties of magnets, unfavorable production efficiency, and low utilization of heavy rare earth elements. , to achieve the effect of high consistency of magnetic properties of products, solution to poor product consistency, and easy commercial application

Inactive Publication Date: 2019-12-03
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these processes have various disadvantages to varying degrees.
After coating, there are phenomena such as uneven surface coating, falling and large spots, poor coating uniformity and different thickness, resulting in poor consistency of magnetic properties of the magnet; the method of evaporation / electrophoresis is difficult to control the weight The evaporation rate and electrophoretic mobility of rare earth elements cannot guarantee poor product consistency, and the utilization rate of heavy rare earth elements is low; the investment in magnetron sputtering equipment is large, and the production capacity is low
In addition, in the diffusion stage, resistance heating is often used. This heating mechanism is mainly based on radiation and conduction, and the heating efficiency is low. It is not conducive to improving production efficiency, causing waste of resources and energy, and may also adversely affect the structure and properties of sintered NdFeB

Method used

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  • Preparation method of sintered neodymium-iron-boron magnet with high magnetic energy product and high coercivity
  • Preparation method of sintered neodymium-iron-boron magnet with high magnetic energy product and high coercivity
  • Preparation method of sintered neodymium-iron-boron magnet with high magnetic energy product and high coercivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for preparing a high energy product, high coercive force sintered NdFeB magnet, the process is as follows:

[0053] A. Preparation of sintered NdFeB blank magnets: Through batching - smelting and stripping - hydrogen explosion - jet milling - magnetic field forming - sintering - machining and other processes, a blank magnet with a size of 8mm in the minimum thickness direction is prepared, marked as 1# .

[0054] B. Pretreatment of the sintered NdFeB blank: use sandpaper to polish the six sides of the blank magnet in turn to remove the surface oxide layer. Then use deionized water to ultrasonically clean the rough magnet to remove surface oil, and the cleaning time is 1 min. Then pickle the blank magnet in nitric alcohol solution to better absorb the heavy rare earth particles, the concentration of nitric acid in the nitric alcohol solution is 3wt.%, and the pickling time is 1min. Finally, the magnet after pickling is cleaned in absolute ethanol to remove the...

Embodiment 2

[0072] A method for preparing a high energy product, high coercive force sintered NdFeB magnet, the process is as follows:

[0073] A. Preparation of sintered NdFeB blank magnets: Through batching - smelting and stripping - hydrogen explosion - jet milling - magnetic field forming - sintering - machining and other processes, a blank magnet with a minimum thickness direction of 7.5 mm is prepared, marked as 1 #.

[0074] B. Pretreatment of the sintered NdFeB blank: use sandpaper to polish the six sides of the blank magnet in turn to remove the surface oxide layer. Then use deionized water to ultrasonically clean the rough magnet to remove surface oil, and the cleaning time is 1 min. Then pickle the rough magnet in nitric alcohol solution, in order to better absorb the heavy rare earth particles, the concentration of nitric acid in the nitric alcohol solution is 3.5wt.%, and the pickling time is 1.5min. Finally, wash the magnet after pickling in absolute ethanol to remove the ...

Embodiment 3

[0084] A method for preparing a high energy product, high coercive force sintered NdFeB magnet, the process is as follows:

[0085] A. Preparation of sintered NdFeB blank magnets: Through batching - smelting and stripping - hydrogen explosion - jet milling - magnetic field forming - sintering - machining and other processes, a blank magnet with a size of 7mm in the minimum thickness direction is prepared, marked as 1# .

[0086] B. Pretreatment of the sintered NdFeB blank: use sandpaper to polish the six sides of the blank magnet in turn to remove the surface oxide layer. Then use deionized water to ultrasonically clean the rough magnet to remove surface oil, and the cleaning time is 2 minutes. Then pickle the rough magnet in nitric alcohol solution to better absorb the heavy rare earth particles, the concentration of nitric acid in the nitric alcohol solution is 4wt.%, and the pickling time is 1.5min. Finally, wash the magnet after pickling in absolute ethanol to remove the...

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Abstract

The invention discloses a preparation method of a sintered neodymium-iron-boron magnet with high magnetic energy product and high coercivity. The method comprises the steps that firstly, a sintered neodymium-iron-boron rough magnet is prepared through the processes of batching, melting stripping, hydrogen explosion, air milling, magnetic field molding, sintering and machining; then pretreatment steps including derusting, degreasing, pickling and cleaning are carried out on the rough magnet; the rough magnet is sprayed and coated with a prepared heavy rare earth suspension; and finally spark plasma diffusion treatment (SPS) and tempering heat treatment are carried out on the magnet sprayed with the heavy rare earth adhesion layer to acquire the sintered neodymium-iron-boron magnet. Compared with the prior art, the preparation method provided by the invention has the advantages of excellent utilization of heavy rare earth, high processing efficiency, low production cost, high magneticproperty consistency and the like, is easy to realize commercial applications, can well meet customer needs, and is suitable for preparing the low-costed sintered neodymium-iron-boron magnet with highmagnetic energy product and high coercivity.

Description

technical field [0001] The invention relates to a preparation method of a sintered NdFeB magnet with high magnetic energy product and high coercive force, and belongs to the technical field of rare earth permanent magnet material preparation. Background technique [0002] Since its invention in 1983, sintered NdFeB magnet has developed into an indispensable key material in high-tech fields such as information, energy, transportation and national defense because of its advantages such as high magnetic energy product, high coercive force and high cost performance. As the world vigorously advocates energy saving, emission reduction and green energy, the new energy industry represented by electric vehicles, wind power, and energy-saving home appliances has developed rapidly. These fields require sintered NdFeB magnets to have a high magnetic energy product BHmax to provide Sufficiently large magnetic energy storage and high enough intrinsic coercivity (Hcj≥30KOe) to ensure norma...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0577H01F41/0293
Inventor 刘晨李益民王霄余勇何浩曾纪术
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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