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Hexagonal ferrite material with high magnetic loss in L wave band and preparation method thereof

A hexagonal ferrite, L-band technology, applied in the field of materials, can solve the problems of mismatch between wave-absorbing coating and free space impedance, inability to absorb electromagnetic waves well, poor magnetic loss performance, etc., and achieve excellent high-frequency soft magnetic properties high performance, easy mass production, and high magnetic loss

Inactive Publication Date: 2015-07-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the materials with large magnetic loss are mainly magnetic alloy powder, but the imaginary part of the magnetic permeability of the alloy powder in the L-band is very low, the magnetic loss performance is poor, and it cannot absorb electromagnetic waves well.
In addition, the alloy powder has a high dielectric constant in the microwave frequency band (such as the L band), which will cause a serious mismatch between the impedance of the absorbing coating and the free space, and then cause the electromagnetic waves to not effectively enter the absorbing coating and be lost , so that this type of alloy powder is mainly used at low frequencies (such as 1Hz ~ 1MHz)

Method used

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  • Hexagonal ferrite material with high magnetic loss in L wave band and preparation method thereof
  • Hexagonal ferrite material with high magnetic loss in L wave band and preparation method thereof
  • Hexagonal ferrite material with high magnetic loss in L wave band and preparation method thereof

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preparation example Construction

[0028] The preparation method comprises the following steps:

[0029] 1. Mixed raw materials: the main components and content (mass percentage) of the present invention are calculated as: BaCO 3 : 0.00~23.55wt%, SrCO 3 :0.00~18.75wt%, CoO: 6.68~7.09wt%, Fe 2 o 3 : 69.76~74.15wt%.

[0030] Weigh the raw materials as required, and put them into a ball mill for ball milling. The mass ratio of the ball milled material, zirconia balls, and deionized water is 1:3:1.2, and the mass ratio of large-sized balls (radius about 4.4mm) and small-sized balls (radius about 2.5mm) is 1: 2. The ball milling time is 3 hours, and the rotation speed is set at 300 revolutions per minute. The main purpose of ball milling is to mix raw materials evenly.

[0031] 2. Pre-burning: Dry the ball-milled raw materials, put the dried raw materials into a high-temperature furnace under air or oxygen atmosphere for pre-burning, the pre-burning temperature is 1120-1220 °C, and the heating rate is 3 °C per...

Embodiment 1

[0034] 1. The main components and content (mass percentage) are calculated as oxides:

[0035] Formulation: BaCO 3 : 23.56wt%, SrCO 3 : 0.00wt%, CoO: 6.67wt%, Fe 2 o 3 : 69.76wt%, that is, the chemical composition is: (Ba 1-x Sr x ) 3 co 2 Fe 24 o 41 , where x=0.0.

[0036]2. Mixing and ball milling raw materials: weigh the raw materials according to the requirements, and put them into a ball mill for ball milling. The mass ratio of the ball milled material, zirconia balls, and deionized water is 1:3:1.2, and the mass ratio of large-sized balls (radius about 4.4mm) and small-sized balls (radius about 2.5mm) is 1: 2. The ball milling time is 3 hours, and the rotation speed is set at 300 revolutions per minute. The main purpose of ball milling is to mix raw materials evenly.

[0037] 3. Pre-burning: After drying the ball-milled raw materials, put them into a high-temperature furnace under air atmosphere for pre-burning. The pre-burning temperature is 1170°C, the heat...

Embodiment 2

[0041] 1. The main components and content (mass percentage) are calculated as oxides:

[0042] Formulation: BaCO 3 : 19.08wt%, SrCO 3 : 3.57wt%, CoO: 6.76wt%, Fe 2 o 3 : 70.59wt%, that is, the chemical composition is: (Ba 1-x Sr x ) 3 co 2 Fe 24 o 41 , where x=0.2.

[0043] 2. Mixing and ball milling raw materials: weigh the raw materials according to the requirements, and put them into a ball mill for ball milling. The mass ratio of the ball milled material, zirconia balls, and deionized water is 1:3:1.2, and the mass ratio of large-sized balls (radius about 4.4mm) and small-sized balls (radius about 2.5mm) is 1: 2. The ball milling time is 3 hours, and the rotation speed is set at 300 revolutions per minute. The main purpose of ball milling is to mix raw materials evenly.

[0044] 3. Pre-burning: Dry the ball-milled raw materials, put the dried raw materials into a high-temperature furnace under an air atmosphere for pre-burning, the pre-burning temperature is 11...

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Abstract

The invention discloses a hexagonal ferrite material with high magnetic loss in L wave band and a preparation method thereof, relates to the material technologies and in particular relates to a magnetic material technology. The chemical component of the material is (Ba[1-x]Srx)3Co2Fe24O41, wherein x is equal to 0.0 or 0.2 or 0.4 or 0.6 or 0.8. The hexagonal ferrite material has the advantages of high magnetic loss, high electrical resistivity and excellent high-frequency soft magnetic properties in the L wave band.

Description

technical field [0001] The present invention relates to material technology, in particular to magnetic material technology. Background technique [0002] With the continuous development of modern electronic technology, the problems of electromagnetic radiation and electromagnetic interference are becoming more and more serious. Most of the electronic and electrical equipment in work are accompanied by the conversion of electromagnetic energy. High-density, wide-spectrum electromagnetic signals fill the entire human living space, causing extremely complex electromagnetic environment. Whether the communication-based electronic system can work normally in this electromagnetic environment is severely tested. In the communication system, integrated circuits have been widely used due to their large-scale use and convenience, and are developing in the direction of miniaturization and high integration. , because the modules are closely connected, the mutual interference of the circ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 韩满贵曹振华董长顺邓龙江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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