Carbonyl iron powder composite wave-absorbing material and preparation method thereof

A technology of composite absorbing material and carbonyl iron powder, which is applied in the direction of carbonyl iron, silicon dioxide, antennas, etc., can solve the problems of magnetic permeability, magnetic loss mismatch, and low magnetic loss performance, and achieve good dispersion and reduce Agglomeration phenomenon, the effect of solving the low performance of magnetic loss

Pending Publication Date: 2021-02-19
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the overall magnetic loss performance of the absorbing material prepared based on carbonyl iron powder is low in each frequency band, and the magnetic permeability and magnetic loss mismatch due to the high real part and imaginary part of the dielectric constant question

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  • Carbonyl iron powder composite wave-absorbing material and preparation method thereof
  • Carbonyl iron powder composite wave-absorbing material and preparation method thereof
  • Carbonyl iron powder composite wave-absorbing material and preparation method thereof

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preparation example Construction

[0022] The present invention provides a kind of preparation method of carbonyl iron powder composite wave-absorbing material in the first aspect, described preparation method comprises the following steps:

[0023] (1) react carbonyl iron powder with hydrochloric acid solution, rinse with deionized water, then add deionized water and stir to obtain the first mixed solution;

[0024] (2) Dissolve tetraethyl orthosilicate (TEOS) and γ-glycidyl etheroxypropyl trimethoxysilane (KH-560) in ethanol and pour into the first mixed solution, mix well to obtain the second mixed solution;

[0025] (3) carrying out the hydrothermal reaction with the second mixed solution;

[0026] (4) Filter the reaction product obtained in step (3), and wash with ethanol and distilled water successively to obtain a solid product;

[0027] (5) drying the solid product to obtain SiO 2 Coated carbonyl iron powder.

[0028] According to some preferred embodiments, in step (1), the particle size of the carb...

Embodiment 1

[0042] (1) First, carbonyl iron powder with an average particle size of 2 μm (see the SEM image for the figure 1 (A) 100g and 100mL of 0.02M hydrochloric acid solution were reacted under ultrasonic conditions for 5min, rinsed with deionized water for 3 times, then added deionized water, and stirred to make it turbid to obtain the first mixed solution;

[0043] (2) Dissolve 80mL of tetraethyl orthosilicate (TEOS) and 6mL of γ-glycidyl etheroxypropyl trimethoxysilane (KH-560) in ethanol, pour into the first mixed solution, and mix well to obtain the second mixed solution. liquid;

[0044] (3) Put the second mixed solution in a constant temperature water bath for 40°C hydrothermal reaction for 8 hours;

[0045] (4) the product obtained from the reaction of step (3) is filtered to obtain a solid, which is washed with ethanol and distilled water successively to obtain a solid product;

[0046] (5) Put the solid product in a vacuum drying oven at 50°C and dry it fully to obtain Si...

Embodiment 2

[0049] (1) First, react 100 g of carbonyl iron powder with an average particle size of 3 μm and 100 mL of 0.03 M hydrochloric acid solution under ultrasonic conditions for 5 minutes, rinse with deionized water for 3 times, then add deionized water, and stir to make it turbid to obtain the first mixture;

[0050] (2) Dissolve 100mL of tetraethyl orthosilicate (TEOS) and 8mL of γ-glycidyl etheroxypropyl trimethoxysilane (KH-560) in ethanol, pour into the first mixed solution, and mix well to obtain the second mixed solution. liquid;

[0051] (3) Put the second mixed solution in a constant temperature water bath for hydrothermal reaction at 50°C for 6 hours;

[0052] (4) the product obtained from the reaction of step (3) is filtered to obtain a solid, which is washed with ethanol and distilled water successively to obtain a solid product;

[0053] (5) Put the solid product in a vacuum drying oven at 50°C and dry it fully to obtain SiO 2 Coated carbonyl iron powder.

[0054] T...

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Abstract

The invention relates to a carbonyl iron powder composite wave-absorbing material with low dielectric constant and high magnetic loss and a preparation method thereof. The preparation method comprisesthe following steps: using carbonyl iron powder as a modified absorbent, using ethyl orthosilicate as a powder coating silicon source, adding carbonyl iron powder into deionized water to form a mixture, and stirring the mixture to be evenly dispersed and mixed; adding gamma glycidyl ether oxypropyl trimethoxy silane dissolved by ethanol and tetraethoxysilane into the mixture according to a certain ratio, and then carrying out a hydrothermal reaction; filtering and collecting solids after the reaction is finished, and washing with ethanol and distilled water in sequence; and putting the obtained solid product into a vacuum drying oven, and fully drying at a constant temperature to obtain the SiO2-coated carbonyl iron powder. According to the invention, the problems of low overall magneticloss performance of the absorption material prepared based on carbonyl iron powder in each frequency band and magnetic conductivity and magnetic loss mismatch caused by over-high real part and imaginary part of the dielectric constant can be solved.

Description

technical field [0001] The invention relates to the technical field of resin-based electromagnetic loss composite materials, in particular to a carbonyl iron powder composite wave-absorbing material with low dielectric constant and high magnetic loss and a preparation method thereof. Background technique [0002] With the development of military technology and the needs of information warfare, radar detection technology has been widely used in the military. Radar detection technology has the advantages of not being affected by weather and darkness, long detection distance, and high detection accuracy, which seriously threatens the security of important military targets and weaponry of the enemy. In order to reduce the possibility of one's own important military targets and weapons being detected by the enemy's radar and improve its battlefield survivability, radar stealth technology emerged as the times require. The research on radar stealth technology mainly focuses on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/16C01B33/12H01Q17/00
CPCC01G49/16C01B33/12H01Q17/00C01P2004/80C01P2004/03C01P2006/40C01P2006/42
Inventor 董立超兰天李南梁垠张春波
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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