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Ferrite permanent magnet material with core-shell structure and preparation method of ferrite permanent magnet material

A technology of ferrite permanent magnet and core-shell structure, which is applied in the direction of inorganic material magnetism, can solve the problems of rising costs, achieve good magnetic properties, high coercive force, and reduce costs

Active Publication Date: 2019-09-06
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, although the magnetic properties of the material have been greatly improved, the performance is essentially improved by increasing the addition of La and Co elements, and the cost has also increased significantly.

Method used

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  • Ferrite permanent magnet material with core-shell structure and preparation method of ferrite permanent magnet material
  • Ferrite permanent magnet material with core-shell structure and preparation method of ferrite permanent magnet material
  • Ferrite permanent magnet material with core-shell structure and preparation method of ferrite permanent magnet material

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preparation example Construction

[0046] A preparation method of ferrite permanent magnet material, comprising the following steps:

[0047] 1) Weigh each initial raw material (Fe 2 o 3 Powder, SrCO 3 Powder, La 2 o 3 Powder, Co 2 o 3 Powder and CaCO 3 powder), and mixed uniformly by wet ball milling; wherein the ball milling solvent is deionized water or tap water, and the ball milling time is 4-6h;

[0048] 2) pre-calcining the material obtained in step 1) at 1200-1300° C. for 1.5-2.5 hours to obtain pre-fired material;

[0049] 3) Coarsely crush the calcined material, and wet ball mill for 15-25 hours until the particle size of the powder is 0.6-1 μm to obtain the slurry M1;

[0050] 4) According to the method of steps 1) to 3), the slurry M2 is obtained, the difference is that the ingredients are mixed according to the proportion of the shell components, and the pre-calcination temperature is changed to 900-1100 ° C, after pre-calcination, the ball mill is 50-100h until the powder particle size is ...

Embodiment 1

[0055] 1) Prepare the following initial materials: Fe 2 o 3 Powder, SrCO 3 Powder, La 2 o 3 Powder, Co 2 o 3 Powder, CaCO 3 powder.

[0056] 2) Weighing, according to Sr 1-x La x Fe 12-y co y o 19 (x=0.02; y=0-0.02) ingredients were distributed and mixed evenly by means of wet ball milling. The solvent during ball milling was deionized water, and the ball milling time was 5 hours.

[0057] 3) Pre-fire the mixed material at 1250° C. for 2 hours to obtain a calcined material.

[0058] 4) Coarsely crush the calcined material, and wet ball mill for 20 hours to obtain powder D 50 Slurry M1 with a particle size of about 0.6 μm.

[0059] 5) Repeat steps 2)-4) to obtain slurry M2, the difference is that the composition of the material in step 2) becomes Sr 1-w- v La w Ca v Fe 12-z co z o 19 (w=0.45; v=0.45; z=0.25), the calcining temperature becomes 1000 ℃ in the step 2, the ball milling time becomes 100 hours in the step 3, and the powder particle size D 50 beco...

Embodiment 2

[0065] The differences between this embodiment and Embodiment 1 are: x=0; y=0.

[0066] The magnetic performance of the magnet that present embodiment obtains is as follows: the thickness of shell layer is 0.3-0.5 μ m, remanence B r =4407Gs, coercivity H cj =4328Oe, maximum energy product (BH) max = 4.63 MGOe.

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Abstract

The invention relates to the field of ferrite materials, and discloses a ferrite permanent magnet material with a core-shell structure and a preparation method of the ferrite permanent magnet material. The ferrite permanent magnet material is formed by mixing, magnetizing, molding and sintering a core component and a shell component; the mass content of elements in the core component is Sr1-xLaxFe12-yCoyO19, wherein x equals 0-0.08, and y equals 0-0.05; the mass content of elements in the shell component is Sr1-w-vLawCavFe12-zCozO19, wherein w equals 0.2-0.45, v equals 0.2-0.45 and z equals 0.15-0.35; the grain of the obtained ferrite permanent magnet material is of a core-shell structure, and the contents of La element and Co element in the grain increase from the inside to the outside with a non-uniform gradient. The ferrite permanent magnet material still can maintain higher magnetic properties under the condition that the use quantity of La-Co elements is reduced.

Description

technical field [0001] The invention relates to the field of ferrite materials, in particular to a ferrite permanent magnet material with a core-shell structure and a preparation method thereof. Background technique [0002] Strontium ferrite permanent magnet material (SrFe 12 o 19 ) has been widely used in the field of motors and sensors due to its good chemical stability, environmental friendliness, high magnetic properties and low price. In recent years, with the development of miniaturization and light weight of magnetic devices, the market has put forward higher requirements for the magnetic properties of ferrite permanent magnet materials. On the other hand, in order to control the production cost of magnetic devices, people hope that the price of ferrite materials will not increase greatly due to the improvement of performance. [0003] The traditional method of improving ferrite permanent magnet materials is generally to use ion substitution, such as using La 3+ ...

Claims

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Application Information

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IPC IPC(8): C04B35/40C04B35/628H01F1/11
CPCC04B35/2633C04B35/2641C04B35/62826C04B2235/3213C04B2235/3227C04B2235/3275C04B2235/442C04B2235/96H01F1/11
Inventor 李玉平包大新何震宇李军华吴云飞
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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