Abstract
Because of the excellent properties, carbonyl iron powder particles and their surface modified products are often used as radar absorbers. The electromagnetic wave attenuation mechanism of the carbonyl iron powders and SiO2 coated carbonyl iron particles were analyzed on the basis of the studies of scholars from all over the world and compared with the solutions calculated by the COMSOL software. The results obtained through the analytical solution and COMSOL simulated calculation values tend to be consistent; the ratio of the complex magnetic permittivity to the complex permittivity of the nano-SiO2 coated carbonyl iron powder particles tend to be 1, and the impedance matching performance of nano-SiO2 coated carbonyl iron powder particles is improved. Compared with the carbonyl iron particles, SiO2 coated carbonyl iron particles have lower electromagnetic wave absorptivity.
Highlights
As a typical magnetic medium absorbent, carbonyl iron powder is often used as a radar absorber because of its wide absorption band
The carbonyl iron powders are black with an iron content of more than 97%, spherical particles, onion-like structure, density of 7.87g/cm[3] and specific surface area greater than 40dm2/g; they have the disadvantages of poor corrosion resistance, poor low-frequency absorption, high density, and the large volume duty cycle of the absorber.[1,2]
This paper provides a theoretical reference for the application of carbonyl iron and SiO2 coated carbonyl iron particles in radar absorption on the basis of the analytical solution of electromagnetic wave energy attenuation formula and the results of COMSOL experimental simulation
Summary
As a typical magnetic medium absorbent, carbonyl iron powder is often used as a radar absorber because of its wide absorption band. Walser et al.[4,5] theoretically proved that the magnetic permeability of sheet like magnetic particles with an aspect ratio of 10 to 1000 and the anisotropy is 10 to 100 times higher than that of spherical particles, and used a high-energy ball milling method to prepare the sheets nanocrystalline iron-based micro powders to verify this theory. Yu et al.[6] used magnetic fieldinduced carbonyl thermal decomposition to change the magnetic field to prepare carbonyl iron fibers and used this fiber as a wave absorber to fill the foam polymer matrix to make a composite material. This paper provides a theoretical reference for the application of carbonyl iron and SiO2 coated carbonyl iron particles in radar absorption on the basis of the analytical solution of electromagnetic wave energy attenuation formula and the results of COMSOL experimental simulation
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