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Preparation method for rare earth and cobalt permanent magnetic particles with high remanence ratio

A high remanence, rare earth technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problem of not considering the remanence ratio of alloy particles, destroying crystallographic anisotropy, and low remanence ratio of alloy particles, etc. Achieve excellent comprehensive performance, reduce oxygen content and high coercivity

Active Publication Date: 2014-08-27
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method does not take into account the remanence ratio of the alloy particles
[0005] However, during the formation process of the rare earth-cobalt permanent magnet alloy particles, due to the severe deformation caused by the high-energy and severe impact of the grinding balls, the crystallographic anisotropy inside the particles is destroyed, resulting in the remanence of the obtained alloy particles. Low

Method used

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  • Preparation method for rare earth and cobalt permanent magnetic particles with high remanence ratio
  • Preparation method for rare earth and cobalt permanent magnetic particles with high remanence ratio

Examples

Experimental program
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Effect test

Embodiment 1

[0032] In this embodiment, the raw materials, selected ball mill, ball milling tank, organic solvent and dosage, ball size and ball-to-material ratio, and the sealing method of the ball milling tank are exactly the same as those of Comparative Example 1 above. The difference is that SmCo is prepared by low temperature ball milling. 5 Granules, prepared as follows:

[0033] After the ball mill jar is sealed well, perform the following operations to achieve low-temperature ball milling:

[0034] (1) is identical with the step (1) in the comparative example;

[0035] (2) Place the ball milling tank with raw materials, balls and organic solvents in liquid nitrogen for low-temperature cooling, take it out after the temperature of the ball milling tank is lower than -150°C, and install it on a ball mill for 5 minutes at normal temperature;

[0036] (3) Set the ball milling time, repeat step (2), until the total ball milling time reaches the set ball milling time, take off the ball...

Embodiment 2

[0049] In this embodiment, the raw material is exactly the same as that of Comparative Example 2.

[0050] The raw material was prepared as SmCo by wet ball milling 5 The preparation method of the particles is basically the same as that in Example 1, except that in step (1), the ball-to-material ratio used is 8:1, and in step (2), the ball milling time is 4 minutes.

[0051] The ball milling product obtained in above-mentioned comparative example 2 and embodiment 2 is tested as follows:

[0052] (1) The ball milling product samples obtained in the above comparative example 2 and embodiment 2 are compared, the ball milling products are all suspended particles, and the lower particles are SmCo 5 Micron level, dense and precipitated at the bottom of the bottle, while the upper layer of particles is SmCo 5 Nanometer level, suspended in an organic solvent, the yield of nanoparticles milled at low temperature in Example 2 is significantly higher than that of nanoparticles milled a...

Embodiment 3

[0064] In this embodiment, the raw materials, the selected ball mill, the ball milling tank, the organic solvent and its dosage, the surfactant and its dosage, the ball size and the ball-to-material ratio, and the sealing method of the ball milling tank are exactly the same as those of Comparative Example 3 above. The difference is that PrCo is prepared by low temperature ball milling. 5 Granules, prepared as follows:

[0065] After the ball mill jar is sealed well, perform the following operations to achieve low-temperature ball milling:

[0066] (1) is identical with the step (1) in the comparative example;

[0067] (2) Place the ball mill tank containing raw materials, grinding balls, surfactants, and organic solvents in liquid nitrogen for low-temperature cooling, take it out after the temperature of the ball mill tank is kept below -90°C, and install it on the ball mill at room temperature Ball mill for 3 minutes;

[0068] (3) Set the ball milling time, repeat step (2)...

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Abstract

The invention provides a preparation method for rare earth and cobalt permanent magnetic particles with the high remanence ratio. According to the method, the low-temperature wet type ball milling technology is adopted; the melting point temperature of organic solvents is controlled to be under minus 50 DEG C; the ball milling temperature is higher than the melting point temperature of the organic solvents and lower than 0 DEG C; in the ball milling process, the mass ratio of ball materials is controlled to be 8:1-9.5:1; the ball milling time of every time is controlled to be within 1.5 minutes to 5 minutes, and the total ball milling time is controlled to be within one hour to ten hours; finally, the rare earth and cobalt permanent magnetic particles with the high nanoscale particle content, the high coercivity and the high remanence ratio are obtained. As a result, the overall performance of the rare earth and cobalt permanent magnetic particles is improved, and the practical application area of the rare earth and cobalt permanent magnetic particles is greatly expanded. In addition, the preparation method has the advantages of being low in cost and easy and convenient to operate and having good application prospects.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and in particular relates to a method for preparing rare earth-cobalt permanent magnet particles with high remanence ratio by adopting low-temperature wet ball milling. Background technique [0002] Rare earth-cobalt alloys, such as samarium-cobalt, praseodymium-cobalt, and permanent magnetic alloy particles containing other doping elements, are used in the preparation of high-temperature high-coercivity magnets, nanocomposite permanent magnets, high-storage magnetic recording materials, and ferrofluids. etc. have an important research and application background. [0003] At present, the methods for preparing rare earth-cobalt permanent magnetic alloy granular materials mainly include chemical synthesis, physical deposition, and ball milling. Among them, the wet ball milling method has become an important and most commonly used method for preparing rare earth-cobalt permane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04H01F1/053H01F1/06
Inventor 刘立东张健王芳夏卫星杜娟闫阿儒刘平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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