Preparation method of magnetic powder

A magnetic powder and magnetic material technology, which is applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problems of material crystal structure damage, etc., and achieve the effect of strong texture, simple steps and wide application

Active Publication Date: 2015-05-27
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, even if the surfactant-assisted ball milling process (including low-temperature assisted ball milling) is used, the crystal structure of the material after ball milling is still destroyed to a large extent. For materials that need to maintain a complete crystal structure as much as possible, especially permanent magnets For materials (high magnetocrystalline anisotropy), strict heat treatment in the later stage is required to eliminate the negative effects of this crystal structure defect.

Method used

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  • Preparation method of magnetic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Weigh the coarsely crushed SmCo 5 Put 5g of material (particle size less than 400μm) into a stainless steel ball mill jar, then add 100g of stainless steel balls (20g for 8mm, 80g for 5mm), and 1ml oleic acid and 1ml oleylamine as surfactants, and finally add 100ml n-heptyl alkanes as organic solvents.

[0029] 2. Seal the ball mill tank containing magnetic material, grinding balls, surfactant and organic solvent in a glove box. Put the sealed ball mill jar on the GN-2 type high-energy ball mill, and ball mill for 5 hours at a voltage of 30v (about 150 rpm); then ball mill for 10 hours at a voltage of 40v (about 200 rpm); then Ball milled for 15 hours at a voltage of 50v (about 250 rpm).

[0030] 3. Take out the balls, pour the milled product into a centrifuge tube, wash it with n-heptane for 5 times, and then dry it to obtain the magnetic powder of the present invention.

[0031] product characterization

[0032] 1. Put the magnetic powder prepared in this emb...

Embodiment 2

[0045] 1. Weigh the coarsely crushed SmCo 5 5g of material (particle size less than 400μm) was put into a stainless steel ball mill jar, then 100g of stainless steel balls (20g of 8mm, 80g of 5mm) were added, and finally 100ml of n-heptane was added as an organic solvent.

[0046] 2. Seal the ball mill jar with magnetic material, grinding balls and organic solvent in the glove box. Put the sealed ball mill jar on the GN-2 high-energy ball mill, ball mill for 1 hour at a voltage of 30v (about 150 rpm), then ball mill for 2 hours at a voltage of 40v (about 200 rpm), and then Ball milled for 4 hours at a voltage of 50v (about 250 rpm).

[0047] 3. Take out the balls, pour the ball-milled product into a centrifuge tube, rinse with n-heptane for 5 times, and then dry to obtain the magnetic powder of the present invention.

[0048] The measurement results of the magnetic powder prepared in this embodiment are shown in Table 1.

Embodiment 3

[0056] 1. Weigh the coarsely crushed Pr 2 Fe 14 5g of material B (particle size less than 400μm), put it into a stainless steel ball mill tank, then add 100g stainless steel grinding balls (20g for 8mm, 80g for 5mm), and 1ml oleic acid and 1ml oleylamine as surfactants, and finally add 100ml n-heptyl alkanes as organic solvents.

[0057] 2. Seal the ball mill tank containing magnetic material, grinding balls, surfactant and organic solvent in a glove box. Put the sealed ball milling tank on the GN-2 high-energy ball mill, ball mill for 1 hour at 30v (about 150 rpm), 1 hour at 40v (about 200 rpm), and 1 hour at 50v (about 250 rev / min) voltage ball milled for 2 hours, then ball milled for 2 hours under 60v (about 300 rev / min) voltage.

[0058] 3. Take out the balls, pour the ball-milled product into a centrifuge tube, rinse with n-heptane for 5 times, and then dry to obtain the magnetic powder of the present invention.

[0059] The measurement results of the magnetic powder ...

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Abstract

The invention provides a preparation method of magnetic powder. The method comprises the following steps: (a) adding a magnetic material, milling balls, an organic solvent and a selectively added surfactant into a ball milling tank; (b) sealing the ball milling tank, and then, carrying out ball milling, wherein a ball milling process is of speed-gradually-increased staged ball milling and at least comprises two ball milling stages, and the time of ball milling of each stage is 0.5-24 hours; (c) taking out the milling balls, pouring a ball-milled product into a vessel, flushing and drying, thereby obtaining the magnetic powder. Compared with the traditional single-speed-adopted ball milling manner, the preparation method has the advantages that the magnetic powder with higher texture degree and more-complete crystal structure can be obtained due to a multistage different-speed ball milling method; the preparation method of the magnetic powder, provided by the invention, is simple in steps, new equipment is not required to be added, and implementation can be achieved by only changing ball milling speed during ball milling and controlling corresponding ball milling time, so that the application is very extensive.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a preparation method of small-sized magnetic powder. Background technique [0002] With the continuous development of modernization, many new fields require the size of raw materials to be as small as possible, even as small as nanometer size and below. For example, the field of magnetic refrigeration that needs small size to increase heat exchange, the field of permanent magnet that needs small size to obtain high coercive force, and the field of electromagnetic that needs small size to reduce eddy current loss, etc. Although materials as small as nanometers can be synthesized chemically, the output is very small, and chemical reagents will also cause certain pollution to the materials. Therefore, at present, the method of producing small-scale particles in large quantities is mainly physical crushing, such as ball milling, jet milling, etc. Since the final particle size of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04H01F1/053H01F1/06
Inventor 左文亮沈保根孙继荣胡凤霞
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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