Structural design and simulation of ultra-broadband TiCxN1-x fibers/Si3N4 high-temperature microwave absorbing composites

• DOI: 10.1007/s42114-025-01280-7
• Publication Date: 2025-03-04T19:44:58Z
• Authors: Guandong Liang; Jianqiang Bi; Shuyong Liang; Chengjiao Che; Lintao Liu; Shouliang Bie; Yao Yang

Currently, high-temperature ceramic-based microwave-absorbing composites face limitations such as a limited range of material systems and narrow effective absorption bandwidth, which hinder their further application in electromagnetic wave field under environments. Herein, guided by simulation, lightweight (1.61 g/cm3), ultra-broadband (32.45 GHz) (800 °C) meta-structure TiCxN1-x fibers/Si3N4 composite was prepared combining composition structural design with the quick gel casting process (20 min). Density functional theory calculations confirmed presence strong interfacial bonding (− 1.77 J/m2) between fibers matrix. After introducing only 4 wt% fibers, flexural strength fracture toughness sample increased 56.24% 111.48%, respectively. Moreover, exhibited superior performance Ku-band at 800 °C compared to room temperature. Based on parameters results simulation calculations, trapezoidal pyramidal 180 mm × designed fabricated. An ultra-wideband (8.25 ~ 40 GHz, X, Ku, K, Ka) for 2 GHz frequency achieved, is good agreement results. This study offers fresh approach designing lightweight, ultra-wideband, structural–functional integrated microwave absorbing