Rare earth permanent magnetic powder and bonded magnet

一种稀土永磁、稀土元素的技术，应用在磁性物体、磁性材料、无机材料磁性等方向，能够解决粘度过大、非晶形成能力不强等问题，达到利于平衡运用的效果

Active Publication Date: 2011-10-05
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The inventors of this patent found that by optimizing the composition of the material and reducing the viscosity of the alloy liquid, the problems of excessive viscosity and weak amorphous formation ability encountered in the preparation process can be improved

Method used

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  • Rare earth permanent magnetic powder and bonded magnet
  • Rare earth permanent magnetic powder and bonded magnet
  • Rare earth permanent magnetic powder and bonded magnet

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Embodiment Construction

[0040] The main preparation process is as follows:

[0041] (1) First, a certain composition of samarium-iron alloy ingredients is smelted through intermediate frequency, electric arc, etc. to obtain alloy ingots, and the ingots are initially crushed to obtain alloy blocks of several mm;

[0042] (2) After the alloy block is melted by induction, the alloy liquid passes through the nozzle to the rotating water-cooled copper wheel, and the samarium-iron alloy powder obtained after quenching;

[0043] (3) The prepared flaky samarium-iron alloy powder is crushed and sieved to remove the superfine powder to obtain a powder with a particle size of 10-100 μm;

[0044] (4) Anneal the obtained samarium-iron alloy powder at 750°C for 5-30 minutes to homogenize the grain structure, and then nitriding at about 450°C for 30 minutes, the nitrogen source is industrial pure nitrogen, a mixture of hydrogen and ammonia, etc.;

[0045] (5) Through the above preparation, the magnetic powder show...

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Abstract

The invention discloses a rare earth permanent magnetic powder which takes Sm, Fe, M, N and Si as main components, and takes a TbCU7 structure as a main phase, the M is at least one of the Be, Cr, Al, Ti, Ga, Nb, Zr, Ta, Mo and V. The Si element is added in the rare earth permanent magnetic powder to add the glass forming ability of a samarium-ferro alloy, and the M element with a certain amount is compounded and added to increase the wetting property of an alloy solution; and therefore, the alloy solution is more convenient to be ejected from a smelting device. The samarium element content in the rare earth permanent magnetic powder is in a 1-12 at% range, the content of the M is in a 0.1-1.5 at% range, the content of N is in a 10-15 at% range, the content of Si is in a 0.1-1.5 at% range, and the rest is ferrum. An average grain size of the rare earth permanent magnetic powder is 10-100 microns; and the rare earth permanent magnetic powder is composed of a nano-crystal with an average size of 10-120 nm and amorphous structure.

Description

technical field [0001] The invention relates to a rare earth permanent magnet powder and a bonded magnet, belonging to the field of rare earth permanent magnet materials. Background technique [0002] Rare earth bonded permanent magnets have been widely used in various electronic equipment, office automation, automobiles and other fields due to their good formability, high dimensional accuracy and high magnetic properties, especially in micro motors. In order to meet the requirements of technological development for miniaturization and miniaturization of equipment, it is necessary to further optimize the performance of the bonded magnetic powder used in the material. [0003] At present, the widely used magnetic powder is NdFeB magnetic powder prepared by rapid quenching method. Due to the reason of NdFeB material itself, its corrosion resistance and temperature resistance are poor, and it is not suitable for the requirements of material performance in harsh environments. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053H01F1/08
CPCC22C45/02C22C33/0278C22C38/10H01F1/0596C22C38/12C22C38/02C22C38/005C22C38/002C22C38/001Y10T428/2982
Inventor 李红卫于敦波罗阳李扩社李世鹏王民袁永强
Owner GRIREM ADVANCED MATERIALS CO LTD
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