Ferrite wave-absorbing material and preparation method thereof

A wave-absorbing material and ferrite technology, applied in the field of radar absorbing materials, can solve the problems of reducing the initial magnetic permeability and dielectric constant, difficult large-scale production, complex preparation process, etc., to improve electromagnetic performance, The effect of low cost and simple process operation

Inactive Publication Date: 2014-01-01
CENT IRON & STEEL RES INST
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  • Abstract
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Problems solved by technology

For example, "Rare earth Z-type ferrite Ba 3-x Ce x co 2 Fe 24 o 41 Preparation and Microwave Absorption Properties", (Chinese Journal of Rare Earth, December 2006, Volume 24 Supplement), using sol-gel method to prepare Z-type barium ferrite doped with cerium (Ba 3-x Ce x co 2 Fe 24 o 41 ,x=0-0.4), in the 8-12GHz frequency band, the wave-absorbing performance of the material has been improved to a certain extent, but the preparation process is complicated, and it is difficult to achieve large-scale production
"Doped SiO 2 low temperature sintered Ba 3 (Co 0.4 Zn 0.6 ) 2 Fe 24 o 41 Hexagonal Ferrite Materials", (Magnetic Materials and Devices, February 2009), Added SiO 2 Inhibited grain growth, reduced its initial permeability and permittivity, but did not study the absorbing properties

Method used

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  • Ferrite wave-absorbing material and preparation method thereof
  • Ferrite wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] BaO, SrCO 3 , CoO and Fe 2 o 3 Analytical pure raw materials are composed according to the chemical formula 3(Ba 0.5 Sr 0.5 )O·2CoO·10.6Fe 2 o 3 0.25Sm 2 o 3 For batching, carry out ball milling and mixing in deionized water for 3 hours, after drying, heat to 1280°C at a heating rate of 3°C / min and pre-fire for 3 hours; add 0.25 moles of Sm 2 o 3 , in deionized water for secondary ball milling and mixing for 6 hours, after drying, heat up to 1250°C at a heating rate of 3°C / min for sintering, and keep warm for 3.5 hours; ball mill the sintered powder for 1 hour, and pass through a 200-mesh sieve to obtain The powder with a diameter of ≤74μm is then heat-treated at 250°C for 3 hours to obtain the ferrite wave-absorbing material. The drying temperature of the raw materials after the first ball milling and the second ball milling is 60-120°C. The purity of the raw material is ≥99.5%. figure 1 This is the scanning electron microscope (SEM) photo of the ferrite abs...

Embodiment 2

[0033] BaO, SrCO 3 , CoO and Fe 2 o 3 Analytical pure raw materials are composed according to the chemical formula 3(Ba 0.5 Sr 0.5 )O·2CoO·11.5Fe 2 o 3 0.15Sm 2 o 3 For batching, carry out ball milling and mixing in deionized water for 4 hours, after drying, heat up to 1270°C at a heating rate of 3°C / min for 3 hours; add 0.20 moles of Sm 2 o 3, in deionized water for secondary ball milling and mixing for 7 hours, after drying, heat up to 1260°C at a heating rate of 4°C / min for sintering, and keep warm for 4 hours; ball mill the sintered powder for 1.5 hours, and pass through a 200-mesh sieve to obtain The powder with a diameter of ≤74μm is then heat-treated at 250°C for 3 hours to obtain the ferrite wave-absorbing material. The drying temperature of the raw materials after the first ball milling and the second ball milling is 60-120°C. The purity of the raw material is ≥99.5%. Mix the obtained ferrite wave-absorbing powder with ordinary epoxy resin E51 in a mass rat...

Embodiment 3

[0035] BaO, SrCO 3 , CoO and Fe 2 o 3 Analytical pure raw materials are composed according to the chemical formula 3(Ba 0.5 Sr 0.5 )O·2CoO·10.8Fe 2 o 3 0.5Sm 2 o 3 For batching, carry out ball milling and mixing in deionized water for 3 hours, after drying, heat up to 1250°C at a heating rate of 4°C / min for 4.5 hours; add 0.5 moles of Sm 2 o 3 , in deionized water for secondary ball milling and mixing for 5 hours, after drying, heat up to 1280°C at a heating rate of 3°C / min for sintering, and keep warm for 3.5 hours; ball mill the sintered powder for 1 hour, and pass through a 200-mesh sieve to obtain The powder with a diameter of ≤74μm is then heat-treated at 250°C for 3 hours to obtain the ferrite wave-absorbing material. The drying temperature of the raw materials after the first ball milling and the second ball milling is 60-120°C. The purity of the raw material is ≥99.5%. Mix the obtained ferrite wave-absorbing powder with ordinary epoxy resin E51 in a mass rat...

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Abstract

The invention relates to a ferrite wave-absorbing material and a preparation method of the ferrite wave-absorbing material. A ferrite is mingled with a rare earth element of samarium and is of a Co2 Z-type planar hexagonal structure. The chemical formula of the ferrite is 3(Ba0.5Sr0.5)O 2CoO yFe2O3 xSm2O3, wherein x and y are mole numbers, 0.15<=x<=0.5, and 10<=y<=12. According to the preparation method of the ferrite wave-absorbing material, on the basis of the traditional ferrite ceramic sintering technology, the Sm element is mingled in to adjust and control the microstructure of the material. Thus, the purpose of improving the electromagnetic property of the material is achieved, the raw materials are easy to obtain, complex equipment is not needed, the technology is easy to operate and master, the cost is low, and the preparation method of the ferrite wave-absorbing material is suitable for large-scale production. The Co2 Z-type ferrite wave-absorbing powder mingled with the rare earth element of samarium can be used for preparing a wave-absorbing coating and has high practical value and extensive application prospects in the electromagnetic shielding and cloaking field.

Description

technical field [0001] The invention relates to the technical field of radar absorbing materials, in particular to a ferrite absorbing material and a preparation method thereof. Background technique [0002] With the development of modern society, wireless communication technology, microwave technology, and digital circuits have been widely used in various fields from production and life to military industry and national defense. The development of these new technologies has not only brought convenience, but also caused a large number of electromagnetic waves to the human environment. pollute. An effective way to solve or reduce electromagnetic pollution and improve the ability of electronic equipment to resist electromagnetic interference is to adopt electromagnetic compatibility design, among which the use of wave-absorbing materials to reduce the harm caused by electromagnetic pollution has become the most effective prevention method. [0003] At present, the widely used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622C09K3/00
Inventor 郭世海张羊换祁焱王煜安静赵栋梁
Owner CENT IRON & STEEL RES INST
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