The absorption mechanism and efficient absorption strategy of coating absorbing materials

Coating absorbing materials, also known as absorbing coatings, are widely used in the fields of stealth technology, electromagnetic shielding, and electromagnetic wave absorption. This article will explore the absorption mechanism of coating absorbing materials and discuss how to ensure their efficient absorption. By introducing Advanced Institute (Shenzhen) Technology Co., Ltd. andResearch Platinum brand absorbing materialsWe will gain a deeper understanding of this field through relevant data and technology.

Absorption mechanism

1. Impedance matching and attenuation conditions

To absorb electromagnetic waves, the absorbing coating must meet impedance matching and attenuation conditions. The impedance matching condition requires that the dielectric constant and magnetic permeability be equal throughout the entire frequency range, but it is difficult to fully achieve in practical operation. Usually, good matching or absorption can be achieved through geometric transitions.

The attenuation condition requires different sizes of dielectric constant and magnetic permeability, so that electromagnetic waves can be rapidly attenuated after entering the material. The design of absorbers should seek the most reasonable combination under these two conditions.

2. Loss mechanism

The loss mechanism is mainly divided into three categories:

• Resistance type loss: It is related to the conductivity of the material, and the higher the conductivity, the more favorable it is for electromagnetic energy to be converted into thermal energy.
• Dielectric loss: related to polarization, achieved through the "friction" effect of repeated polarization.
• Magnetic loss: related to the dynamic magnetization process, achieved through the "friction" effect of repeated magnetization.

3. Material type

Absorbing coatings can be divided into magnetic absorbing coatings and dielectric absorbing coatings.Magnetic absorbing coatingUsing magnetic materials as absorbers, the magnetic permeability of the coating material is improved by controlling factors such as the properties of the added magnetic material, filling ratio, and coating thickness. Dielectric absorbing coatings design the material to have a surface impedance close to the free space impedance, and the dielectric constant increases along the thickness direction of the absorbing material, which facilitates the transmission and absorption of incident electromagnetic waves.

Strategies to ensure efficient absorption

1. Material selection

The selection of low reflection and high absorption electromagnetic absorbing materials should follow the following principles:

• Improving electromagnetic losses: converting electromagnetic wave energy into thermal energy or other forms of energy, thereby maximizing absorption in the medium.
• Satisfy the impedance matching condition: reduce the reflection of electromagnetic waves at the incident interface, while enhancing the absorption of electromagnetic waves that have entered the medium.

Research on platinum brand absorbing materials has shown outstanding performance in this field due to their lightweight, high-strength, and wideband absorption characteristics. For example, itsCarbon fiber absorbing materialIt has been widely used in the fields of aerospace and automotive manufacturing.

2. Composite of multiple materials

It is difficult to simultaneously achieve impedance matching and strong absorption for a single component absorbing medium. Therefore, by combining multiple materials and making the electromagnetic parameters adjustable, the material's ability to absorb losses can be improved while meeting matching conditions as much as possible.

Advanced Institute (Shenzhen) Technology Co., Ltd. has conducted in-depth research in this field. For example, scholars added Fe, nano Fe, and FeC2O4-2H2O to PAN polymerization solution and heat treated them to form magnetic graphene composites. When the coating thickness reached 2.5mm, the minimum reflection loss value R could reach -46dB, far higher than the level of R<-10dB.

3. Coating design

• Thickness optimization: In general, the electromagnetic parameters of the material are constant, and the thickness can be adjusted to change the reflectivity of the material. When the thickness is large, the absorption peak of the material appears at low frequencies, while the absorption bandwidth becomes narrower.
• Structural design: By designing interference type and resonance type absorbing coatings, the absorption frequency band can be widened and the absorption efficiency can be improved.

For example, interference type absorbing coatings improve the absorption effect by filling a layer of non-destructive medium between the metal plate and the loss medium, so that the reflected electromagnetic waves and the electromagnetic waves directly reflected by the coating surface interfere with each other and cancel each other out.

data support

• Research Platinum Brand Carbon Fiber Absorbing MaterialsExcellent conductivity, lightweight and high-strength, wide frequency absorption.
• Magnetic graphene composite: When the coating thickness reaches 2.5mm, the minimum reflection loss value R can reach -46dB.

conclusion

The absorption mechanism of coating absorbing materials involves impedance matching, attenuation conditions, and various loss mechanisms. In order to ensure efficient absorption, it is necessary to select suitable materials, carry out multi-component composite, and carry out reasonable coating design. Advanced Institute (Shenzhen) Technology Co., Ltd. and Research Platinum brand absorbing materials have provided advanced technology and solutions in this field, promoting the development of stealth technology and electromagnetic shielding.

The above data is for reference only, and specific performance may vary due to production processes and product specifications.