Abstract: The surface of carbonyl iron powder was treated with polyvinylpyrrolidone (PVP), and CoFe2O4 was directly synthesized on the surface of carbonyl iron particles by Co2+ and Fe3+. Three kinds of carbonyl iron/CoFe2O4 core-shells structural powder with different CoFe2O4 content were successfully prepared. The morphology, composition and electromagnetic properties of carbonyl iron particles before and after the addition of CoFe2O4 were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), infrared spectroscopy (FTIR) and vector network analyzer (VNA). The results show that the irregular particle nano CoFe2O4 powder was successfully prepared. The CoFe2O4 powder was mostly coated on the surface of flaky carbonyl iron. With the increase of the amount of CoFe2O4, the thickness of the coating gradually increases and tends to be completely coated. The CoFe2O4 powder coating layer effectively reduced the dielectric constant of carbonyl iron, improved the impedance matching performance in low frequency, realized the combined absorbing effect of ferroelectric and ferromagnetic, and improved the low frequency absorbing performance. The absorbing properties of the material were analyzed by the interface reflection model and impedance matching principle. The relationship between the peak frequency of the reflection and the electromagnetic parameters was analyzed by the 1/4 wavelength interference cancellation theory.
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2020, Vol. 34 
