Effect of SiC doping on microwave absorbing properties of ball-milled carbonyl iron/MoS2 composites

Abstract

Using MoS₂ to prepare novel composite absorbing coatings is an effective strategy to enhance electromagnetic wave absorption. In order to explore the preparation process of large-scale preparation of MoS₂ composite absorbing materials, a Fe/MoS₂/SiC laminated composite absorbing material was prepared by high-energy ball milling method to realize the absorption of electromagnetic waves. By adjusting the proportion of SiC, SiC, MoS₂ and Fe were ball-milled at room temperature for 20 h, and the dielectric properties were improved to achieve good absorbing effect. The microstructure and properties of the materials were measured by XRD, SEM, Raman, XPS, HRTEM, VSM and VNA. The results show that the doping of appropriate amount of SiC reduces the interplanar spacing of MoS₂ and increases the edge points, which increases the conductivity of MoS₂. MoS₂ reduces the number of layers and increases its size and area, which improves the dielectric properties of Fe/MoS₂ and optimizes the electromagnetic parameters of the composites. When the ratio (mole) of SiC, Fe and MoS₂ is 3:6:2, the best electromagnetic wave absorption effect is obtained, the lowest electromagnetic wave reflection loss is −72.98 dB, and the best bandwidth is 3.04 GHz when the matching thickness is 6.53 mm.