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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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, a large amount of ferrite needs to be added Micron-scale components, which increase the cost of the product, provide the application of nano-materials in ferrite. Through the addition of nano-materials, only need to add less nano-materials to achieve higher magnetic properties, greatly reducing the ferrite body cost

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take the following recipe:

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

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

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

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

[0027] Vibrate and disperse the nano-scale additives in an ultrasonic vibration container for 10-20 minutes, and add the above-mentioned ferrite calcined powder into a small ball mill for wet grinding for 26 hours. After grinding, the particle size fineness of the discharged material is about It is 0.75μm. After wet grinding, the slurry is precipitated and dehydrated, and then shaped.

[0028] Sintering is carried out in the air, the heating rate is 1...

Embodiment 2

[0039] Take the following recipe:

[0040] Select SrO·6Fe 2 o 3 The calcined material is processed into a powder with a particle size of about 3.5 μm by dry vibration grinding.

[0041] The following nanomaterials are used as additives:

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

[0043] co 2 o 3 Powder (purity ≥ 99.0wt%, primary particle size of particles: 1-300nm) 0.3wt%

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

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

[0046] Vibrate and disperse the nano-scale additives in an ultrasonic vibration container for 10-20 minutes, and add the above-mentioned ferrite calcined powder into a small ball mill for wet grinding for 26 hours. After grinding, the particle size fineness of the discharged material is about It is 0.75μm. After wet grinding, the slurry is precipitated and dehydrated...

Embodiment 3

[0060] ZnO (20.5-25.5 mol%), MnO (21.5-26.5 mol%) and the rest are Fe 2 o 3 It is used as the main component for batching, vibrating ball milling and dry mixing, and the obtained mixture is put into a rotary kiln at 850° C. to 950° C. for 1 to 3 hours of pre-calcination. The obtained calcined body is added with the nanomaterials in Table 4 as additives, and the particle size of these nanomaterials is between 1 and 300 nm: the nanomaterials are first dispersed by ultrasonic waves and then put into a sand mill together with the main components for sand milling. Then, add PVA and dispersant to it and granulate it by spray drying, and use an automatic molding machine to shape it into a blank with a certain shape; heat it, keep it at 1350-1390°C for 3-8 hours, and then lower the temperature to sinter it. From the obtained compact, toroidal magnetic cores (samples 1 to 6) having an outer diameter of 10 mm, an inner diameter of 6 mm, and a height of 4 mm were obtained. Sintering is...

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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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