A preparation method of sintered rare earth iron boron permanent magnet material with controlled grain boundary

A permanent magnet material, rare earth iron boron technology, applied in the direction of magnetic materials, inductors/transformers/magnet manufacturing, magnetic objects, etc., can solve the problem of reducing remanence, magnet coercive force and force improvement limited, grain boundary composition or structure Influence and regulation are limited, to achieve the effect of increasing the adsorption strength, reducing the distribution range, and eliminating the possibility of oxidation

Active Publication Date: 2022-05-17
JIANGXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when doping elements are added from the smelting stage, most of the doping elements inevitably enter the main phase grains, and only a small part enters the grain boundary. Although it can improve its coercive force and mechanical properties, there are two problems: on the one hand, it reduces remanence; on the other hand, the impact and regulation on the grain boundary composition or structure is limited
Therefore, the coercive force and force of the magnet can be limited by doping certain metal elements.

Method used

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  • A preparation method of sintered rare earth iron boron permanent magnet material with controlled grain boundary
  • A preparation method of sintered rare earth iron boron permanent magnet material with controlled grain boundary
  • A preparation method of sintered rare earth iron boron permanent magnet material with controlled grain boundary

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Convert the nominal component to Nd 18.5 PR 5.5 Gd 2 Ce 5 Nb 0.1 Zr 0.1 Fe 67.8 B 1 Alloy thick strips are processed by hydrogen explosion and jet milling to produce magnetic powder with an average particle size of about 3 microns; Al nano-powder is prepared by high-voltage arc evaporation-condensation technology; nano-suspension is prepared by absolute ethanol, and the magnetic powder is added to the suspension The liquid is mixed and stirred, the excess liquid is poured off, vacuum-dried and treated with an ultrasonic vibrator to restore the air-dried powder to its flow properties. The doping Al concentration is 0.49wt%, and the sintering and heat treatment processes are: temperature 1050°C, time 2.5hr; temperature 900°C, time 2hr; temperature 500°C, time 2hr. The product obtained in this embodiment is called sample 1.

Embodiment 2

[0044]The doping process is the same as in Example 1, the doping Al concentration is 0.86wt%, the sintering and heat treatment processes are: temperature 1050°C, time 2.5hr; temperature 900°C, time 2hr; temperature 500°C, time 2hr. The product made in this embodiment is called sample 2.

Embodiment 3

[0046] The doping process is the same as in Example 1, the doping Al concentration is 1.15wt%, the sintering and heat treatment processes are: temperature 1050°C, time 2.5hr; temperature 900°C, time 2hr; temperature 500°C, time 2hr. The product made in this embodiment is called sample 3.

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Abstract

The invention provides a preparation method of a sintered rare earth iron boron permanent magnet material which regulates grain boundaries, and belongs to the field of magnetic materials. The main steps of the method are as follows: 1. Utilize the conventional method of sintering NdFeB to prepare magnetic powder, and the doping metal is not added at this stage; 2. Prepare metal fine powder (nano powder or micron powder) doped with metal (or alloy); 3. Under an inert atmosphere, use metal fine powder and volatile organic solvent to prepare a suspension, add magnetic powder to this solution, immerse, stir, stand still, vacuumize and evaporate, and use ultrasonic vibration to restore the fluidity of the coated magnetic powder; 4. Orient the coated magnetic powder, sinter and heat treat it.

Description

technical field [0001] The invention relates to a preparation method of a sintered rare earth iron boron permanent magnet material, belonging to the technical field of magnetic materials. Background technique [0002] Sintered NdFeB permanent magnet material is the strongest permanent magnet material today, widely used in computer, electronics, communication, automobile, electromechanical and other fields. Sintered NdFeB material has excellent intrinsic magnetism, but as a magnet, there are some limitations, which require technical innovation to improve and optimize its performance. [0003] There are some typical problems in the existing sintered NdFeB permanent magnet materials, which affect the realization of its excellent performance and better use, such as: 1. The coercive force is much lower than its theoretical value, which affects the magnetic properties and the use at higher temperatures ; 2. Poor mechanical properties, easy to be brittle, affecting the service lif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266
Inventor 王公平吴双
Owner JIANGXI NORMAL UNIV
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