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Rust-resistant carbonyl iron powder wave-absorbing material and preparation method thereof

A technology of carbonyl iron powder and wave-absorbing materials, which is applied in antennas, electrical components, magnetic field/electric field shielding, etc., and can solve problems such as changes in the electromagnetic properties of wave-absorbing materials, easy to rust, and failure to meet the needs of wave-absorbing materials

Inactive Publication Date: 2021-09-14
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, magnetic metal micropowder is currently the most researched type of absorbent, and carbonyl iron powder is the most commonly used among them. However, most of the absorbent materials prepared based on carbonyl iron powder have poor corrosion resistance and oxidation resistance, especially in wet conditions. Or it is easy to rust in the salt spray environment, which will cause the electromagnetic properties of the absorbing material to change, which cannot meet the use requirements of the absorbing material

Method used

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  • Rust-resistant carbonyl iron powder wave-absorbing material and preparation method thereof
  • Rust-resistant carbonyl iron powder wave-absorbing material and preparation method thereof
  • Rust-resistant carbonyl iron powder wave-absorbing material and preparation method thereof

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preparation example Construction

[0036] Such as figure 1 As shown, the embodiment of the present invention provides a method for preparing an anti-corrosion carbonyl iron powder absorbing material, the method includes the following steps:

[0037] In step (1), carbonyl iron powder and acetone are mixed and stirred to obtain the first mixture;

[0038] Step (2), adding ammonia water, tetraethyl orthosilicate and titanate coupling agent to the first mixture, and continuing to stir to obtain a second mixture;

[0039] In step (3), the second mixture is subjected to a hydrothermal reaction, and after the hydrothermal reaction is completed, it is filtered, washed and dried to obtain the target carbonyl iron powder;

[0040] In step (4), the target carbonyl iron powder and epoxy resin are mixed, stirred, and cured to obtain a carbonyl iron powder wave-absorbing material.

[0041] It should be noted that the stirring in step (1) is mechanical stirring; preferably, acetone is used, and ethanol can also be used for ...

Embodiment 1

[0070] (1) Add 10 g of flaky carbonyl iron powder (with a particle size of 1-10 μm and a thickness of 0.5-3 μm) into acetone, and stir with mechanical stirring for 20 minutes to obtain the first mixture;

[0071] (2) Add 143 mL of ammonia water with a concentration of 1 mol / L, 5 g of tetraethyl orthosilicate and 5 g of titanate coupling agent TC-WT to the first mixture, and continue stirring to mix uniformly to obtain the second mixture;

[0072] (3) Put the second mixture in a 90°C constant temperature water bath for 8 hours of hydrothermal reaction. After the hydrothermal reaction is completed, the solid product is obtained by filtration, and washed with ethanol and distilled water in sequence, and the washed solid product is placed at 50°C. Carry out drying in the vacuum oven, obtain target carbonyl iron powder;

[0073] (4) Mix 10 g of the target carbonyl iron powder with 2.5 g of epoxy resin, mechanically stir, place in a mold, and cure (put in an oven and heat to 120°C f...

Embodiment 2

[0076] Example 2 is basically the same as Example 1, except that 10 g of tetraethyl orthosilicate and 10 g of titanate coupling agent TC-WT are added.

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Abstract

The invention provides a rust-resistant carbonyl iron powder wave-absorbing material and a preparation method thereof, and the method comprises the following steps: mixing carbonyl iron powder and acetone, and stirring to obtain a first mixture; adding ammonia water, tetraethoxysilane and a titanate coupling agent into the first mixture, and continuously stirring to obtain a second mixture; performing a hydrothermal reaction on the second mixture, and after the hydrothermal reaction is finished, performing filtering, washing and drying treatment to obtain target carbonyl iron powder; and mixing the target carbonyl iron powder with epoxy resin, stirring, and curing to obtain the carbonyl iron powder wave-absorbing material. According to the scheme, the rust-resistant carbonyl iron powder wave-absorbing material can be provided, the problem that a wave-absorbing material prepared from carbonyl iron powder is prone to rusting under complex working conditions such as military and civil fields is solved, and the rust resistance of the carbonyl iron powder wave-absorbing material is improved on the premise that the electromagnetic performance is guaranteed.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of electromagnetic loss composite materials, in particular to a corrosion-resistant carbonyl iron powder wave-absorbing material and a preparation method thereof. Background technique [0002] The absorbing material is a kind of energy that can absorb and attenuate the incident electromagnetic wave, and convert the electromagnetic wave energy into other forms of energy (such as mechanical energy, electrical energy and thermal energy) through the dielectric loss of the material and dissipate it, or make the electromagnetic wave due to interference. Disappearance, but the reflection, scattering and projection are very small functional materials, which are widely used in various types of spacecraft in antennas, synthetic splitters, microwave components and other positions. With the development of electromagnetic stealth technology in the military field and the increasingly serious prob...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08K9/10C08K9/04C08K3/18C08K7/00H05K9/00H01Q17/00
CPCC08K9/10C08K9/04C08K3/18C08K7/00H05K9/0081H01Q17/00C08L63/00
Inventor 董立超兰天赵慈李南张春波
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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