Impedance matching optimization of SiCf/Si3N4–SiOC composites for excellent microwave absorption properties

Core–shell Si3N4@WS2 porous ceramics with improved electromagnetic wave absorption performance

“…6i). 13,48–56 Si 3 N 4 @WS 2 -3 exhibited outstanding EMW absorption performance with wider absorption bands and stronger absorption, surpassing the performance of most of the ceramic-based materials. To reveal the excellent performance of Si 3 N 4 @WS 2 -3, the absorption mechanism was analyzed from multiple scales, as shown in Fig.…”

Preparation of SiCf/Si–O–C composites by impregnation pyrolysis of polysiloxane and its electromagnetic wave absorption properties

“…The matrix modification of SiC f /Si-O-C composites is an effective method to improve their EMW absorption properties. [18][19][20] Ren et al 18 used PIP method to prepare the SiC f /Si-O-C composites with different contents of SiO 2 filler and found that the complex permittivity of the composites gradually decreased as the amount of SiO 2 increased, whereas the SiC f /Si-O-C composites with a mass ratio of SiO 2 to polysiloxane 1:5 exhibits an effective absorption bandwidth (EAB) of 3.21 GHz and minimum reflection loss (RL min ) of −26.0 dB at 3.0 mm. Yang et al 19 prepared SiC f /Si 3 N 4 -Si-O-C-Si 3 N 4 composites using the alternating CVI and PIP method, in which a sandwich structure was generated by the composite matrix enhanced the interface polarization while optimizing the impedance matching, and the EAB of the composites could reach 4.1 GHz.…”

“…The matrix modification of SiC f /Si–O–C composites is an effective method to improve their EMW absorption properties 18–20 . Ren et al 18 .…”