First of all, we understand the absorbing principle of nano coating materials
The essence of absorbing material is to absorb or attenuate the incident electromagnetic wave, and dissipate the electromagnetic wave energy into heat energy or other forms of energy through the dielectric loss of the material. The absorbing material is usually composed of matrix material (binder) and absorbing medium (absorber).
Secondly, the classification of absorbing materials is as follows
Absorbing materials can be divided into electric loss type and magnetic loss type
1) Electrical loss materials absorb and attenuate electromagnetic waves mainly by means of electronic polarization, ion polarization, molecular polarization or interface polarization;
2) The absorption and attenuation of electromagnetic waves are mainly caused by magnetic excitation mechanisms such as hysteresis loss, domain wall resonance and aftereffect loss;
Due to the fine grain size, the number of atoms in the grain boundary is more than that in the grain boundary, that is to say, the high concentration grain boundary is produced, which makes the nano materials have many different properties from the general coarse-grained materials. Nanoparticles have small size effect, surface and interface effect, quantum size effect, dielectric effect and macroscopic quantum tunneling effect.
The main reasons for the excellent microwave absorbing properties of nanomaterials are as follows:
1) Nano materials have high concentration of grain boundaries, the specific surface area of atoms at the crystal interface is large, there are many suspended bonds, and the interface polarization is strong, so it is easy to produce multiple scattering. Under the effect of electromagnetic field radiation, due to the surface effect of nanoparticles, the movement of atoms and electrons is intensified and magnetized, so that electromagnetic energy can be more effectively converted into heat energy, resulting in strong wave absorption effect;
2) Secondly, the existence of quantum size effect makes the electronic energy levels of nanoparticles split, and the energy level gap is in the range of microwave energy level (10-2 ~ 10-5ev), so it becomes a new wave absorbing channel of nano materials. In addition, nano ions have large saturation magnetic induction, high hysteresis loss and coercivity, which make nano materials have high eddy current loss, Curie point and service temperature High, wide absorption frequency and other properties.
The microwave absorbing structure characteristics of the nano coating are as follows
This structural feature of nano materials makes nano absorbing materials have the characteristics of wide absorption band, good compatibility, light weight and thin thickness. It is easy to meet the requirements of radar absorbing materials "thin, light, wide and strong". It is a kind of high-performance and multi-functional absorbent with great development prospects.
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