Preparation method of self-orientation Z-type hexaferrite substrate

A hexagonal ferrite and orientation technology, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve complex problems such as inability to obtain orientation degrees, and achieve improved orientation degrees, excellent magnetic properties, and magnetoelectric coupling Performance, the effect of a large diameter-to-thickness ratio

Active Publication Date: 2018-07-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the existing methods for improving the orientation degree of ferrite materials are relatively complicated, and cannot obtain an ideal orientation degree.

Method used

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  • Preparation method of self-orientation Z-type hexaferrite substrate
  • Preparation method of self-orientation Z-type hexaferrite substrate
  • Preparation method of self-orientation Z-type hexaferrite substrate

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preparation example Construction

[0024] A method for preparing a self-oriented Z-type hexagonal ferrite substrate, including precursor preparation and molding sintering, the specific steps are as follows:

[0025] Step 1, preparation of precursor:

[0026] 1.1 Add ferric nitrate, strontium nitrate, and cobalt nitrate into deionized water, and mix evenly to obtain mixed liquid A; wherein, the concentration of ferric nitrate in mixed liquid A is 0.8-1.2mol / L, and the concentration of ferric nitrate, strontium nitrate, and cobalt nitrate The molar ratio is 24:(6~9):2;

[0027] 1.2 Prepare a strong alkali solution with a concentration of 6.5-13.5mol / L;

[0028] 1.3 Mix the mixed solution A obtained in step 1.1 with the strong alkali solution obtained in step 1.2 to obtain a mixed solution B, wherein the volume ratio of the mixed solution A to the strong alkali solution is 1:1;

[0029] 1.4 Transfer the mixed liquid B obtained in step 1.3 to the reaction kettle, seal it and fill it with nitrogen gas so that the ...

Embodiment 1

[0034] A method for preparing a self-oriented Z-type hexagonal ferrite substrate, including precursor preparation and molding sintering, the specific steps are as follows:

[0035] Step 1, preparation of precursor:

[0036] 1.1 Weigh 61.526g ferric nitrate (Fe(NO 3 ) 3 9H 2 O), 7.98g strontium nitrate (Sr(NO 3 ) 2 ), 3.6746g cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) add 150mL deionized water, stir and mix evenly to obtain mixed solution A;

[0037] 1.2 Weigh 55g NaOH and add it into 150mL deionized water, stir and dissolve to obtain a strong alkali solution;

[0038] 1.3 Mix the mixed solution A obtained in step 1.1 with the strong alkali solution obtained in step 1.2 to obtain mixed solution B;

[0039]1.4 Transfer the mixed liquid B obtained in step 1.3 to the reaction kettle, seal it and fill it with nitrogen, so that the initial pressure in the reaction kettle is 1.5MPa, run the reaction kettle, and hydrothermally heat it at a stirring rate of 100r / min and a temperatur...

Embodiment 2

[0044] Compared with embodiment 1, this embodiment differs in that: in step 2, the sintering temperature is 1200° C., and the sintering time is 6 h; other steps are the same as in embodiment 1.

[0045] Table 1 is the performance and evaluation result of the ferrite substrate material that embodiment 1 and embodiment 2 obtain; As can be seen from table 1, the Z-type hexagonal ferrite substrate material that the present invention obtains has higher degree of orientation, adopts the present invention The method can realize the preparation of a self-aligned substrate material.

[0046] The performance of the substrate material that the embodiment of table 1 obtains

[0047]

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Abstract

The invention relates to a preparation method of a self-orientation Z-type hexaferrite substrate and belongs to the technical field of magnetic materials. The method includes: using a hydrothermal method to acquire precursor powder using M phase as the main crystal phase, wherein the M-phase precursor is large in diameter-thickness ratio, even in particle size distribution, free of agglomeration and the like, is a quite ideal texturing growth template and does not need an extra grain template. The Z-type hexaferrite substrate obtained by the method has a self-orientation feature, the orientation of the Z-type hexaferrite substrate does not need a complex casting process and an additional magnetic field, the specific saturation magnetization of the obtained Z-type hexaferrite substrate canreach 51.3emu/g after self-orientation, and the orientation degree of the Z-type hexaferrite substrate in the (001) direction is increased to 66.2%.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, in particular to a self-oriented Z-type hexagonal ferrite (Sr 3 co 2 Fe 24 o 41 ) method for preparing the substrate. Background technique [0002] Anisotropic magnetic materials can effectively improve the magnetic permeability without sacrificing other properties, which is of great significance to the performance improvement and miniaturization of devices. Single crystal material is a very ideal material. It has uniform composition, basically no gaps, and has extremely good magnetic anisotropy. However, the manufacturing process of single crystal ferrite is complicated and the cost is high. Therefore, the most widely used one is still polycrystalline ferrite material. The grain orientation of polycrystalline ferrite material is chaotic, which is closer to isotropic material, and its performance is far inferior to that of single crystal ferrite. In order to effectively utilize t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622H01F41/02
CPCC04B35/2675C04B35/622C04B2235/3213C04B2235/3275H01F41/0266
Inventor 贾利军李俊龙胡邦文张怀武李元勋
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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