Electromagnetic and microwave absorption properties of Ti_3SiC_2/NiFe_2O_4/epoxy resin coatings

摘要

In this study, coatings containing double-loss Ti_3SiC_2/NiFe_2O_4 absorbents with excellent chemical stability were synthesized. The Ti_3SiC_2/NiFe_2O_4 fillers were heat treated at 800 ~ 1000 °C and their microwave absorbing properties were studied. The XRD patterns showed that NiFe_2O_4 were successfully synthesized by self-propagating combustion method. The SEM images indicated that the NiFe_2O_4 powders were evenly attached on the Ti_3SiC_2 powders. As the temperature rises, the diffraction peak intensities and particle sizes of NiFe_2O_4 were enhanced. The electromagnetic properties of the Ti_3SiC_2/NiFe_2O_4/epoxy resin coatings were also investigated. As the temperature increased from 800 to 1000 °C, the complex permittivity increased while the permeability decreased. The microwave absorption properties were also enhanced with the rising temperature. For the powders heat treated at 1000 °C, the coating acquired the most desirable absorption performance. The coating with a thickness of 2.0 mm owned the widest effective absorption bandwidth in the range of 8.94 ~ 11.40 GHz (2.46 GHz).