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Process and equipment for preparing anisotropic rare-earth permanent-magnet powder and product prepared thereby

A rare earth permanent magnet, anisotropic technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of magnetic powder performance loss, non-involvement, etc.

Active Publication Date: 2011-06-29
GRIREM ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of them involve applying a magnetic field during the preparation process to improve the anisotropy of the magnetic powder and the crystal form of the magnetic powder prepared by this method.
[0011] The phenomenon of strong magnetic field-induced texture structure has been observed in various processing processes of different magnetic materials. In terms of preparation of anisotropic magnetic powder, the anisotropy of magnetic powder prepared by traditional methods is below 0.6. Magnetic powder More performance loss

Method used

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  • Process and equipment for preparing anisotropic rare-earth permanent-magnet powder and product prepared thereby
  • Process and equipment for preparing anisotropic rare-earth permanent-magnet powder and product prepared thereby
  • Process and equipment for preparing anisotropic rare-earth permanent-magnet powder and product prepared thereby

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Embodiment

[0058] (1) Preparation of raw materials

[0059] With the composition shown in Table 1, quantitatively weigh the raw material elements or raw material alloys, and then conduct induction melting or rapid solidification to obtain alloys after the materials are prepared, and then perform annealing treatment at a certain temperature and time under the protection of argon to make the alloy structure Uniform, coarse powder with a particle size of 5-25mm is obtained after coarse crushing and enters the equipment for hydrogen-induced reaction treatment. In Table 1, the component compositions are expressed in atomic percent.

[0060] (2) Preparation of anisotropic magnetic powder

[0061] The alloys according to the composition ratio shown in Table 1 were annealed and crushed, and then treated in the hydrogen-induced reaction process.

[0062] A high-temperature hydrogen absorption process in which the alloy is treated under the condition of maintaining the hydrogen partial pressure ...

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Abstract

The invention relates to a process and equipment for preparing anisotropic rare-earth permanent-magnet powder and a product prepared thereby. The equipment for preparing the magnetic powder comprises three parts, namely a heating and magnetic field orientation system, a flow control system and a vacuum system. The preparation process comprises the following steps of: putting rare earth elements containing Sc and Y and rare earth alloy which takes boron and iron as principal components into the preparation equipment, and performing high-temperature hydrogen treatment at the temperature of between 650 and 900 DEG C under the hydrogen partial pressure of 10 to 90 kPa; and performing multi-step dehydrogenation at the temperature of between 750 and 950 DEG C under a certain magnetic field. Through the method, magnetic powder grains can be refined, and anisotropy and magnetic property are improved.

Description

technical field [0001] The invention relates to a preparation process, device and product of anisotropic rare earth permanent magnet powder, in particular to applying a magnetic field during the preparation process of the magnetic powder to improve related magnetic properties such as anisotropy. technical background [0002] Bonded NdFeB magnets have excellent magnetic properties, mechanical properties, and good processability, and have great application and development prospects. The market demand has increased significantly. At present, they have been widely used in automobiles, computer peripherals, electronics, office automation and other in electronic devices. Bonded rare earth permanent magnets are mainly used in the stator or rotor magnets of various micro motors in the information industry. Information products require micro motors to output higher power while reducing the volume, so the magnets are required to have higher magnetic properties and more Smaller, more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00H01F1/053
Inventor 李红卫于敦波李扩社罗阳李世鹏袁永强王民闫文龙
Owner GRIREM ADVANCED MATERIALS CO LTD
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