Application of nano material in ferrite

A nanomaterial and ferrite technology, applied in the field of nanomaterials, can solve the problems of reducing the cost of ferrite, uneven distribution of additive ions, increasing costs, etc., to improve magnetic properties, prevent excessive growth, and increase the effect. Effect

Active Publication Date: 2008-04-02
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is aimed at the existing ferrite, because most of the micron-scale components existing in the addition of micron-scale components are solid-dissolved on the grain boundaries during sintering, resulting in uneven distribution of additive ions. If a higher magnetic performance is achieved,

Method used

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  • Application of nano material in ferrite
  • Application of nano material in ferrite
  • Application of nano material in ferrite

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1:

[0022] Use the following formula:

[0023] Use SrO·6Fe 2 O 3 The pre-fired material is processed by dry vibration grinding into powder with a particle size of about 3.5μm, and the following nano materials are used as additives:

[0024] CaCO 3 Powder (purity≥99.0wt%, original particle size of particles: 100~300nm) 1.1wt%;

[0025] SiO 2 Powder (purity≥99.0wt%, original particle size of particles: 100~300nm) 0.7wt%;

[0026] Al 2 O 3 Powder (purity≥99.0wt%, original particle size of particles: 100~300nm) 0.8wt%;

[0027] The nano-scale additives are first vibrated and dispersed in an ultrasonic vibration container for 10-20 minutes, and then added to a small ball mill together with the above-mentioned ferrite pre-fired powder for wet grinding for 26 hours. After grinding, the particle size of the discharged material is about It is 0.75μm. After wet grinding, the slurry is dewatered by precipitation and then shaped.

[0028] Sintering is carried out in air at a t...

Example Embodiment

[0038] Example 2

[0039] Use the following formula:

[0040] Use SrO·6Fe 2 O 3 The pre-fired material is processed by dry vibration grinding into powder with a particle size of about 3.5μm.

[0041] The following nano materials are used as additives:

[0042] CaO powder (purity ≥99.0wt%, original particle size of particles: 1~3μm) 0.6wt%

[0043] Co 2 O 3 Powder (purity ≥99.0wt%, original particle size of particles: 1~300nm) 0.3wt%

[0044] La 2 O 3 Powder (purity ≥99.0wt%, original particle size of particles: 1~300nm) 0.5wt%

[0045] SiO 2 Powder (purity ≥99.0wt%, original particle size of particles: 1~3μm) 0.5wt%

[0046] The nano-scale additives are first vibrated and dispersed in an ultrasonic vibration container for 10-20 minutes, and then added to a small ball mill together with the above-mentioned ferrite pre-fired powder for wet grinding for 26 hours. After grinding, the particle size of the discharged material is about It is 0.75μm. After wet grinding, the slurry is dewa...

Example Embodiment

[0059] Example 3:

[0060] The rest of ZnO (20.5-25.5 mol%) and MnO (21.5-26.5 mol%) are Fe 2 O 3 As the main ingredients, the mixture is mixed with vibrating ball mill, and the obtained mixture is put into a rotary kiln at 850°C to 950°C for 1 to 3 hours. The obtained calcined body is added with the nano materials in Table 4 as additives. The particle size of these nano materials is between 1 and 300 nm: the nano materials are first dispersed by ultrasonic wave and then put into a sand mill for sand grinding together with the main components. Then, PVA and dispersant are added to it and spray-dried to granulate, and an automatic molding machine is used to form a blank with a certain shape; by heating, holding at 1350 to 1390°C for 3 to 8 hours, and then cooling to sinter the The obtained compacts obtained toroidal cores (samples 1 to 6) having an outer diameter of 10 mm, an inner diameter of 6 mm, and a height of 4 mm. Sintering is performed in an atmosphere with strictly control...

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Abstract

The present invention relates to the application of nano-material in ferrite. The nano-material is an ideal crystal micro-structure 'control agent', and can be partly dissolved on a grain boundary in a solid way; thus the nano-material can effectively reduce the sintering temperature, prevent the excessive growth of ferrite, maintain the ferrite of single domain, and improve the function of density of sintered ferrite at the same time so as to improve the magnetic properties. Besides, the nano-material is a good ''replacement agent of ion''.In the solid-phase reaction, some elements enter the crystallite structure to perfect the crystal structure, so as to further improve saturated magnetic field strength of ferrite and improve the anisotropic constant and other functions of magnetic crystal.

Description

technical field [0001] The invention relates to the use of nanometer materials, in particular to the application of nanometer materials as additives in ferrite. Background technique [0002] Nano material (nano material), also known as ultrafine particle material, is composed of nano particles (nano particle). Nanoparticles, also known as ultrafine particles, generally refer to particles with a size between 1 and 300nm, whose size is in the transition zone between atomic clusters and macroscopic objects. The type microscopic system is also not a typical macroscopic system, but a typical mesoscopic system, so nanomaterials are the category of mesoscopic physics research. Due to the surface effect, small size effect and macroscopic quantum tunneling effect of nanomaterials, it will show many strange characteristics, that is, its optical, thermal, electrical, magnetic, mechanical and chemical properties are compared with those of bulk solids. will be significantly different. ...

Claims

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Application Information

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IPC IPC(8): C04B35/63C04B35/26
Inventor 何震宇何军义包大新何时金
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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