Preparation and microwave absorption performance of multilayered heterogeneous composite materials
The BaTiO3(BTO)/Fe3O4/melamine foam heterostructure composites with three-dimensional network structure were prepared using a combined template method and physical mechanical mixing method,where the scientific control group was prepared using a component control method.The surface morphology and crystal structure of the samples were characterized by scanning electron microscopy and X-ray diffractometry.To evaluate the complex permittivity and permeability of the samples in the frequency range of 2-18 GHz,a vector network analyzer was used,and the reflection loss value was calculated based on the measured experimental data.The absorption mechanism and performance of the composite system were explored through finite element analysis using COMSOL software.The results show that a large number of heterogeneous interfaces generated are successfully introduced by BTO and Fe3O4 into the three-dimensional carbon network structure,resulting in a heterogeneous structure.Moreover,BTO and Fe3O4 optimize the impedance matching of the three-dimensional network structure,significantly improve the effective absorption bandwidth of the multilayered heterogeneous composite materials.The high porosity three-dimensional network composed of BTO,Fe3O4 and three-dimensional carbon network structure leads to multiple reflections and scattering of electromagnetic waves inside the material,achieving the improved absorption efficiency.When BTO and Fe3O4 powder are evenly mixed and added to melamine foam,achieving the mass of loaded particles reaching up 30%(mass fraction)of the total mass of foam,the strongest reflection loss value at the thickness of 2.9 mm reaches up to-54.76 dB.Furthermore,the effective absorption bandwidth is significantly widened to 7.92 GHz at the thickness of 2.7 mm.
multilayered heterogeneous composite materialsmicrowave absorption performancethree-dimensional network structurereflection loss
万方数据
维普
