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Magnetite electromagnetism wave-absorbing material with anisotropy and preparing method thereof

An electromagnetic absorbing and anisotropic technology, which is applied in the field of magnetite electromagnetic absorbing materials and the preparation of magnetite electromagnetic absorbing materials, can solve the problems of inability to obtain absorbing performance, long time consumption, irregular shape, etc. , to achieve excellent electromagnetic properties, improve magnetic loss, and uniform size

Inactive Publication Date: 2019-08-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many problems in the existing research: 1. Due to the large demagnetization factor of traditional spherical fillers, it is easy to cause low magnetic permeability and cannot obtain good microwave absorption performance; 2. The existing flaky magnetite preparation The process is complex, time-consuming, low yield, and irregular in shape and size

Method used

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  • Magnetite electromagnetism wave-absorbing material with anisotropy and preparing method thereof
  • Magnetite electromagnetism wave-absorbing material with anisotropy and preparing method thereof
  • Magnetite electromagnetism wave-absorbing material with anisotropy and preparing method thereof

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Embodiment 1

[0027] The preparation method of the present invention has anisotropic magnetite electromagnetic wave-absorbing material, specifically comprises the following steps:

[0028] Step 1, preparing regular hexagonal α-Fe 2 o 3 Microchip: 2.7032gFeCl 3 ·6H 2 O with 0.051g MgCl 2 ·6H 2 O was dissolved in 30 mL of distilled water to obtain a mixed solution containing ferric chloride and magnesium chloride; subsequently, 0.041 mL of Na 2 Si 3 o 7 Solution (Na 2 Si 3 o 7 The mass percent concentration of the solution is 10%), then add 5.2g sodium hydroxide, after stirring for 30 minutes, put the mixed material in an oven, and keep it warm for 4 hours at 200°C; after centrifugation, washing and drying, α- Fe 2 o 3 Microchip;

[0029] Step 2, preparing regular hexagonal Fe 3 o 4 Microchip: the α-Fe obtained in step 1 2 o 3 The microchip is placed in a quartz tube, and calcined at 800° C. for 2 hours in a mixed atmosphere composed of 5% by mass hydrogen and 95% by mass arg...

Embodiment 2

[0031] Na 2 Si 3 o 7 with MgCl 2 ·6H 2 O as a surfactant for the above α-Fe 2 o 3 The research method of the impact of microchip morphology specifically includes the following steps:

[0032] Step 1, prepare and add different Na 2 Si 3 o 7 with MgCl 2 ·6H 2 Regular hexagonal α-Fe with O content 2 o 3 Microchip: 0.1mol of FeCl 3 ·6H 2 O and 0~0.02mol of MgCl 2 ·6H 2 O was dissolved in 30mL distilled water to obtain a mixed solution containing ferric chloride and magnesium chloride; subsequently, 0-0.02mol Na 2 Si 3 o 7 Solution (Na2 Si 3 o 7 The concentration of the solution is 10%), then add 1.3mol sodium hydroxide, after stirring for 30 minutes, put the mixed material into the oven, and keep it warm for 4 hours at 200°C; 2 Si 3 o 7 with MgCl 2 ·6H 2 O amount of α-Fe 2 o 3 microchip.

[0033] Step 2, calculate the above-mentioned addition of different amounts of MgCl 2 ·6H 2 O and Na 2 Si 3 o 7 The resulting regular hexagonal α-Fe 2 o 3 The a...

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Abstract

The invention discloses a magnetite electromagnetism wave-absorbing material with anisotropy. The crystalline grains of the material are of orthohexagonal sheet structures. The invention further discloses a preparing method of the magnetite electromagnetism wave-absorbing material. The preparing method specifically comprises the steps of adding a Na2Si3O7 solution and NaOH into a mixed solution containing ferric chloride and magnesium chloride, and after a reaction is finished, separating and washing a product to obtain orthohexagonal alpha-Fe2O3; conducting heat treatment on the obtained alpha-Fe2O3 under the protection of a mixed atmosphere of hydrogen and argon to obtain the orthohexagonal magnetite electromagnetism wave-absorbing material with anisotropy. The crystalline grains of themagnetite electromagnetism wave-absorbing material are of the sheet structures, each sheet structure has a regular structure and morphology and is in an orthohexagonal shape, the sizes of all the sheet structures are uniform, the material has large anisotropy due to the orthohexagonal sheet morphology, thus interfacial polarization of Fe3O4 particles is enhanced, magnetic loss of the material is increased accordingly, and the wave-absorbing performance is improved at the same time.

Description

technical field [0001] The invention relates to an anisotropic magnetite electromagnetic wave-absorbing material, and also relates to a preparation method of the above-mentioned anisotropic magnetite electromagnetic wave-absorbing material, which belongs to the technical field of microwave absorbing materials. Background technique [0002] With the development of electromagnetic technology and the advancement of radar technology, the demand for electromagnetic absorbers in the industrial and military fields is increasing. To date, the most popular absorbers include carbon-based materials, magnetic metals, ferrites, and conductive polymers. Among them, ferrite has a relatively suitable dielectric constant and magnetic permeability, which makes it have better impedance matching, so as to achieve a wider attenuation bandwidth. For example, Jiao Mingchun's research group at Inner Mongolia University synthesized (Cu 0.2 Ni 0.8 )Fe 2 o 4 Spinel-type ferrite has a maximum abso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08
CPCC01G49/08C01P2002/72C01P2004/03C01P2004/22C01P2006/42
Inventor 杨志鸿李萌张雨
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS