Research On Absorbing Performance Of Ti₃C₂T_x/Fe₃O₄/Carbonyl Iron Composite

With the rapid development of science and technology,electronic devices are widely used in the military and civil fields,which brings great convenience to human survival and development.At the same time,the electromagnetic pollution also seriously affects human health and living environment.Therefore,the research of absorbing materials is of great significance.In this paper,Fe₃O₄/Ti₃C₂T_x,Fe₃O₄/carbonyl iron and Ti₃C₂T_x/Fe₃O₄/carbonyl iron composites with different morphologies were prepared by solvothermal method and in-situ formation method,respectively.The microstructure,phase composition,electromagnetic properties and microwave absorbing properties of the composites were systematically studied:(1)Flower-like Fe₃O₄/Ti₃C₂T_x composites were prepared by solvothermal method.It can effectively improve the impedance matching and increase the peak reflectivity.At5.25 GHz and 16.98 GHz,the peak reflectivity is-33.98 d B and-30.84 d B respectively,and the effective absorption bandwidth is 2.21 GHz and 1.96 GHz.(2)Flower-like Fe₃O₄/flaky carbonyl iron composites were successfully prepared by solvothermal method.When the mass of flaky carbonyl iron is 0.3 g and 0.5 g,the microwave absorbing properties of the composites show"geometric effect".When the thickness of sample S1 is 5.0 mm,the peak reflectivity is-20.37 d B at 4.49 GHz and-11.24 d B at 15.96 GHz,respectively.When the thickness of sample S2 is 4.5 mm,the peak reflectivity reaches-17.70 d B t 5.17 GHz and-29.03 d B at 17.66 GHz,respectively.(3)Ti₃C₂T_x/flower-like Fe₃O₄/flaky carbonyl iron composite was prepared by solvothermal method.With the increase of the mass ratio of Ti₃C₂T_x,the peak reflectivity of the composites increases.When the Ti₃C₂T_x content is 20 wt%,the peak reflectivity at9.59 GHz is-45.85 d B,and the effective absorption bandwidth is 3.32 GHz.(4)Polyhedral Fe₃O₄ was formed in situ on the surface of carbonyl iron with different morphologies.With the increase of p H value,the mass and particle size of Fe₃O₄on the surface of carbonyl iron increased.The formation of Fe₃O₄ can effectively adjust the electromagnetic parameters of the material.(5)Combining Ti₃C₂T_x with carbonyl iron/polyhedron Fe₃O₄ with different morphologies can effectively increase the reflectivity peak of the material.The peak reflectivity of Ti₃C₂T_x/spherical carbonyl iron/polyhedral Fe₃O₄ composite at 8.40 GHz is-42.9 d B,and the effective absorption bandwidth is 3.74 GHz.The peak reflectivity of Ti₃C₂T_x/flaky carbonyl iron/polyhedral Fe₃O₄ composite at 9.16 GHz is-52.1 d B,and the effective absorption bandwidth is 3.32 GHz.