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Aluminum oxide-carbonyl iron microsphere wave-absorbing agent and preparation method thereof

A carbonyl iron and wave absorber technology, applied in the field of wave absorbers, can solve the problems of poor impedance matching, poor oxidation resistance and corrosion resistance, and high density of carbonyl iron microspheres.

Pending Publication Date: 2021-05-04
LUOYANG INST OF CUTTING EDGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbonyl iron microspheres have high density, poor oxidation and corrosion resistance, high dielectric constant, and poor impedance matching, which limit their application in a wider range of fields.

Method used

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  • Aluminum oxide-carbonyl iron microsphere wave-absorbing agent and preparation method thereof
  • Aluminum oxide-carbonyl iron microsphere wave-absorbing agent and preparation method thereof
  • Aluminum oxide-carbonyl iron microsphere wave-absorbing agent and preparation method thereof

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preparation example Construction

[0028] The application also provides the Al 2 o 3 -The preparation method of carbonyl iron microsphere wave absorbing agent, comprises the following steps:

[0029] A) carbonyl iron microspheres are pretreated in an acid solution, and vacuum-dried to obtain carbonyl iron microspheres with a passivation film on the surface;

[0030] B) reacting the carbonyl iron microspheres obtained in step A) with ferric chloride solution to obtain porous carbonyl iron microspheres;

[0031] C) pickling the porous carbonyl iron microspheres, and vacuum drying to obtain carbonyl iron microspheres without a passivation film on the surface;

[0032] D) react the carbonyl iron microspheres obtained in step C) with the aluminum source and then vacuum dry to obtain Al 2 o 3 -Carbonyl iron microsphere absorber.

[0033] Al was prepared in the above 2 o 3-In the process of the carbonyl iron microsphere wave absorbing agent, the application first pre-treats the carbonyl iron microsphere in an a...

Embodiment 1

[0042] A new type of Al 2 o 3 The preparation method of porous carbonyl iron microsphere wave absorbing agent comprises following two major steps:

[0043] 1. Preparation of porous carbonyl iron microspheres

[0044] 1.1 Pretreatment of carbonyl iron surface

[0045] Weigh 4 parts of carbonyl iron microspheres with a particle size of 2-20 μm and place them in a beaker, add 20 parts of dilute hydrochloric acid with a pH of 4, ultrasonicate the beaker for 3 minutes, separate the carbonyl iron microspheres and dilute acid with a magnet, and then use them separately Wash twice with deionized water and absolute ethanol, put into a vacuum drying device and dry in vacuum at 40°C for 30min;

[0046] 1.2 Porosity of carbonyl iron microspheres

[0047] Weigh 4 parts of carbonyl iron microspheres after surface pretreatment into a beaker, add 60 parts of ferric chloride solution, the concentration is 0.1mol / L, ultrasonic treatment for 8min, so that the carbonyl iron microspheres and t...

Embodiment 2

[0053] A new type of Al 2 o 3 The preparation method of porous carbonyl iron microsphere wave absorbing agent comprises following two major steps:

[0054] 1. Preparation of porous carbonyl iron microspheres

[0055] 1.1 Pretreatment of carbonyl iron surface

[0056] Weigh 2 parts of carbonyl iron microspheres with a particle size of 2-20 μm and place them in a beaker, add 30 parts of dilute hydrochloric acid with a pH of 2, ultrasonicate the beaker for 5 minutes, separate the carbonyl iron microspheres and dilute acid with a magnet, and then use them separately Wash twice with deionized water and absolute ethanol, put into a vacuum drying device and dry in vacuum at 40°C for 30min;

[0057] 1.2 Porosity of carbonyl iron microspheres

[0058] Weigh 2 parts of carbonyl iron microspheres after surface pretreatment into a beaker, add 80 parts of ferric chloride solution with a concentration of 0.1mol / L, and ultrasonically treat for 10 minutes to fully react the carbonyl iron ...

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Abstract

The invention provides an Al2O3-carbonyl iron microsphere wave-absorbing agent, which is composed of carbonyl iron microspheres and Al2O3 coated on the surfaces of the carbonyl iron microspheres, and the surfaces of the carbonyl iron microspheres have a porous structure. The invention further provides a preparation method of the Al2O3-carbonyl iron microsphere wave-absorbing agent. In the process of preparing the Al2O3-carbonyl iron microsphere wave-absorbing agent, carbonyl iron microspheres are subjected to porous treatment firstly, then Al2O3 nano layer surface coating is performed, and the novel Al2O3-carbonyl iron microsphere wave-absorbing agent is prepared. According to the Al2O3-porous carbonyl iron microsphere wave-absorbing agent provided by the invention, the density of carbonyl iron microspheres is greatly reduced due to the unique porous and core-shell structure, the wave-absorbing agent is excellent in high temperature resistance and oxidation resistance, the dielectric constant can be reduced, the impedance matching can be improved, the wave-absorbing efficiency can be improved on the premise of keeping the magnetic conductivity basically unchanged, the compatibility with a matrix can also be improved, and the interface bonding force is improved.

Description

technical field [0001] The invention relates to the technical field of wave absorbing agents, in particular to an Al 2 o 3 - Carbonyl iron microsphere wave absorbing agent and preparation method thereof. Background technique [0002] With the rapid development of electronic information and military power, weapons and equipment fly faster and faster during use, and special parts such as skins rub against the air to generate a lot of heat. Oxidation performance, but most of the absorbing materials researched in China at present are room temperature absorbing materials. In order to realize the high temperature resistance and oxidation resistance of the absorbing material, the preparation of the absorbing agent is very important. [0003] Carbonyl iron microspheres are the most important electromagnetic wave absorber materials, which have the advantages of low price, easy preparation, large industrial output, stable quality, high magnetic saturation intensity, high magnetic p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/16C01F7/14C09K3/00
CPCC01F7/141C01G49/16C01P2004/03C01P2004/61C01P2004/80C01P2006/11C09K3/00
Inventor 刘若鹏赵治亚刘志礼
Owner LUOYANG INST OF CUTTING EDGE TECH
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