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Preparation method of silicon dioxide coated carbonyl iron material

A technology of silicon dioxide and carbonyl iron, applied in the field of wave absorbing materials, can solve the problems of high cost, uneven distribution of silicon dioxide, low production efficiency of silicon dioxide-wrapped carbonyl iron materials, etc.

Pending Publication Date: 2022-04-12
AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON
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Problems solved by technology

[0003] Existing methods for preparing carbonyl iron materials coated with silica, one is by plasma deposition, and the other is prepared by hydrothermal method; however, the silica coated carbonyl iron materials prepared by plasma electron The distribution of silicon is not uniform; and the production efficiency and high cost of silica-wrapped iron carbonyl materials prepared by hydrothermal method

Method used

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  • Preparation method of silicon dioxide coated carbonyl iron material
  • Preparation method of silicon dioxide coated carbonyl iron material
  • Preparation method of silicon dioxide coated carbonyl iron material

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preparation example Construction

[0030] Existing methods for preparing carbonyl iron materials coated with silica, one is by plasma deposition, and the other is prepared by hydrothermal method; however, the silica coated carbonyl iron materials prepared by plasma electron The distribution of silicon is not uniform; while the silicon dioxide-coated iron carbonyl material prepared by the hydrothermal method has low production efficiency and high cost.

[0031] In view of this, the present invention provides a method for preparing a silica-wrapped carbonyl iron material. The silica-wrapped carbonyl iron material prepared by the preparation method has the advantages of uniform silica wrapping, stable structure and high production efficiency. figure 1 For the schematic flow chart of an embodiment of the preparation method of the silica-wrapped carbonyl iron material provided by the present invention, please refer to figure 1 , in this embodiment, the preparation method of the silica-wrapped carbonyl iron material ...

Embodiment 1

[0049] (1) Get 150kg of industrial alcohol and place it in the reactor, get 10kg of carbonyl iron powder and place it in the reactor, and stir at a speed of 45 rpm until the carbonyl iron powder is evenly dispersed in the industrial alcohol to obtain carbonyl Iron powder dispersion;

[0050] (2) Continue to stir at a speed of 45rpm with the stirring speed, add 7kg, a mass percent concentration of 20% sodium silicate solution to the carbonyl iron powder dispersion, stir for 5min, then increase the stirring speed to 200rpm, add 3kg, mass percent The percentage concentration is 30% hydrochloric acid, continue to stir 9h, make it fully react and obtain mixed solution;

[0051] (3) centrifuge the obtained mixed solution, and centrifuge at 3000rpm for 5min, collect the precipitate, use distilled water to clean the precipitate 3 times, then place the cleaned precipitate in an atmosphere furnace, feed argon, and The temperature was heated to 80°C, and after drying for 4 hours, the pr...

Embodiment 2

[0053] (1) Get 150kg of industrial alcohol and place it in the reactor, get 10kg of carbonyl iron powder and place it in the reactor, and stir at a speed of 47 rpm until the carbonyl iron powder is evenly dispersed in the industrial alcohol to obtain carbonyl Iron powder dispersion;

[0054] (2) Continue to stir at a speed of 47rpm with a stirring speed, add 7kg, a mass percent concentration of 20% sodium silicate solution to the carbonyl iron powder dispersion, stir for 5min, then increase the stirring speed to 200rpm, add 3kg, mass percent The percentage concentration is 30% hydrochloric acid, continue to stir for 5h, make it fully react and obtain mixed solution;

[0055] (3) centrifuge the obtained mixed solution, and centrifuge at 3000rpm for 5min, collect the precipitate, use distilled water to clean the precipitate 3 times, then place the cleaned precipitate in an atmosphere furnace, feed argon, and The temperature was heated to 80°C, and after drying for 4 hours, the ...

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Abstract

The invention discloses a preparation method of a silicon dioxide coated carbonyl iron material, which comprises the following steps: dispersing carbonyl iron powder in a solvent to obtain carbonyl iron powder dispersion liquid; under the stirring condition, sequentially adding a silicate aqueous solution and acid into the carbonyl iron powder dispersion liquid, and reacting to obtain a mixed solution; and carrying out solid-liquid separation on the mixed solution, and sintering a solid-phase substance in an inert atmosphere at 80-400 DEG C to obtain the silicon dioxide-coated carbonyl iron material. The invention aims to provide the preparation method of the silicon dioxide-coated carbonyl iron material, so as to prepare the silicon dioxide-coated carbonyl iron material with stable structure and stable performance.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a method for preparing a silicon dioxide-wrapped carbonyl iron material. Background technique [0002] In recent years, with the changes in the international situation, microwave-absorbing materials used in military affairs have received more and more attention and demand, and the requirements for absorbers that can resist microwave absorption in various environments are increasing. Carbonyl iron powder is widely used in radar stealth materials due to its low dielectric constant, high magnetic permeability, large magnetic loss, and good dispersion characteristics. However, carbonyl iron is easily corroded in the ocean and has poor environmental resistance. , and it is not resistant to high temperature, so it cannot be widely used as an environment-resistant absorbent. In order to improve the environmental resistance of carbonyl iron absorbents, the most commonly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/16H01Q17/00C01B33/12
Inventor 冷少争陈路龙昌魏凌云
Owner AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON
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