A kind of preparation method of ferrite and ferrite prepared by the same

A technology of ferrite and permanent magnet ferrite, which is applied in the field of sintered ferrite and ferrite, can solve the problems of limited performance improvement of ferrite, and achieve the effects of improving magnetic performance, reducing adhesion, and enhancing the degree of arrangement

Active Publication Date: 2017-07-18
BGRIMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this approach has limited performance improvements for ferrite

Method used

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  • A kind of preparation method of ferrite and ferrite prepared by the same
  • A kind of preparation method of ferrite and ferrite prepared by the same
  • A kind of preparation method of ferrite and ferrite prepared by the same

Examples

Experimental program
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Effect test

preparation example Construction

[0034] A kind of ferrite preparation method, it specifically can comprise the following steps:

[0035] Step A, preparing ferrite pre-sintered material, and performing wet crushing treatment on ferrite pre-sintered material until the average particle size of ferrite pre-sintered material reaches 0.8-0.9 microns, thereby obtaining ferrite pre-sintered material pulp.

[0036] Wherein, the ferrite calcined material contains A, R, M, Ti and Fe hexagonal ferrite main phase, and conforms to the following general formula: (1-x)AO(x / 2)R 2 o 3 (n-z-y / 2)Fe 2 o 3 Z 2 o 3 wxya 2 ; In the formula, A is at least one of Sr elements or Ba elements; R is a combination of Y elements or rare earth elements and La elements, or R is only La elements; M is at least one of Mn elements or Zn elements A combination with Co element, or M is only Co element; x, y, z are calculated according to the amount of substance, and satisfy the following conditions: 0.04≤x≤0.5, 0.04≤z≤0.4, 0.005≤y≤0.15, An...

Embodiment 1

[0055] A ferrite is prepared by the following ferrite preparation method, and its specific steps include:

[0056] Step A1', prepare ferrite calcined material according to the following composition ratio of ferrite calcined material.

[0057] Among them, the ferrite calcined material contains the main phase of hexagonal ferrite of A, R, M, Ti and Fe, and conforms to the following general formula: (1-x)AO(x / 2)R 2 o 3 (n-z-y / 2)Fe 2 o 3 Z 2 o 3 wxya 2 ; In the formula, A adopts Sr element; R adopts La element; M adopts Co element; n=5.87.

[0058] In step A2', the pre-sintered ferrite is coarsely crushed by a dry mill until the average particle size of the pre-sintered ferrite reaches 3.0-5.0 microns, that is, the pre-sintered ferrite is obtained after crushing.

[0059] Step A3', taking 300g of the above coarsely crushed ferrite calcined material, and adding 0.2% of SiO to the coarsely crushed ferrite calcined material, which accounts for 0.2% of the total weight of the ...

Embodiment 2

[0079] A group of ferrites, all adopted the same ferrite calcined material as in Example 1, and its preparation steps are basically the same as in Example 1, and its special feature is: in step A3', wet in a horizontal ball mill The crushing time of the crushing method is 4.5 hours, 7 hours, 9.5 hours, 12 hours, and 16.5 hours, so that the average particle size of the ferrite calcined material after crushing corresponds to 1.2 microns, 0.95 microns, 0.82 microns, 0.7 microns, and 0.6 microns .

[0080] Specifically, the upper and lower surfaces of the dry-formed sintered permanent magnet ferrite finally obtained in the implementation 2 are ground, and the residual magnetic induction (Br), coercive force (Hcb), and intrinsic coercivity of the ferrite are analyzed. Coercivity (Hcj), maximum energy product (BH)max, magnet density (ρ) and other performance parameters were measured, as well as the yield of molded body. The specific performance data are shown in Table 3; in Table 3,...

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Abstract

The invention discloses a ferrite preparation method and the prepared ferrite thereby. The method comprises the following steps: preparing a ferrite pre-sintering material and performing wet crushing treatment, thereby obtaining ferrite pre-sintering material slurry; drying the ferrite pre-sintering material slurry; performing vibro-milling treatment on the dried ferrite pre-sintering material powder for 20-40 minutes by adopting a vibration mill; performing high speed dispersion treatment on the vibro-milled powder; uniformly mixing the ferrite pre-sintering material powder subjected to high speed dispersion with an adhesive, performing dry pressing in a magnetic field, thereby obtaining the formed ferrite; sintering the formed ferrite, thereby obtaining the high-performance dry pressed and sintered permanent magnetic ferrite. According to the method disclosed by the invention, the density of the formed ferrite can be improved, adhesion among the ferrite particles can be reduced, and the dispersity of the ferrite particles is improved, so that the arrangement degree of the ferrite particles along the easy magnetization direction is improved, and the orientation degree of the particles is greatly improved. Therefore, the magnetic performance of the dry pressed and sintered permanent magnetic ferrite can be greatly improved.

Description

technical field [0001] The invention relates to the field of sintered ferrite, in particular to a ferrite preparation method and the prepared ferrite. Background technique [0002] At present, the forming methods of anisotropic sintered permanent magnet ferrite can be mainly divided into wet forming and dry forming. [0003] In wet forming, due to the presence of dispersion media such as water or ethanol, the ferrite particles are easy to rotate, and the ferrite particles are easy to arrange along the direction of easy magnetization in the magnetic field, which will make the formed ferrite obtain higher The degree of orientation, so wet-formed ferrite can obtain higher magnetic properties. However, wet molding needs to discharge the dispersion medium out of the mold cavity during press molding, so the productivity is low; in addition, wet molding has higher requirements for production equipment and higher production costs. [0004] In the existing dry molding, dry ferrite ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 刘辉李炳山滕阳民徐文生魏汉中王颖泉全小康
Owner BGRIMM TECH CO LTD
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