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Design of ceramic metamaterial with high temperature radar-infrared-compatible stealth based on one-step in situ pressureless sintered TiB2/MgAl2O4 ceramics
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DOI：10.1016/j.mtphys.2026.102110.png)
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Abstract
En 中文
Currently, the conflicting underlying physical mechanisms have caused the poor compatibility between radar and infrared (IR) stealth, particularly at high temperatures. Among various materials, the TiB2/MgAl2O4 ceramic metamaterial has long been regarded as an ideal candidate for excellent impedance matching, electromagnetic wave (EMW) attenuation and thermal insulation performance at high temperatures. In this study, the TiB2/MgAl2O4 ceramics were fabricated via a one-step in situ pressureless sintering route, which effectively improved the dispersion of TiB2 absorbers. A three-dimensional (3D) periodic metamaterial was designed to improve high temperature radar-IR-compatible stealth performance. Results show that the one-step in situ sintering processes can introduce a rather homogenous dispersion of the TiB2 absorber into the MgAl2O4 matrix, increasing the polarization relaxation loss. Representatively, the TiB2/MgAl2O4 ceramic with 15 wt% TiB2 achieved a minimum reflection loss (RLmin) of −19.65 dB at 1.00 mm, 17.91 GHz, and 100 °C. The TiB2/MgAl2O4 ceramic metamaterial maintained reflection loss (RL) below −15 dB across the entire Ku band from 25 to 700 °C, which is attributed to the synergistic effects of impedance matching, conductive loss, polarization loss, and resonant loss. Moreover, the aerogel-based TiB2/MgAl2O4 ceramic metamaterial exhibited a thermal insulation of 685.80 °C under a 1200 °C thermal load for 810 s, highlighting its potential for IR stealth applications. This study offers an engineerable solution for radar-IR-compatible stealth materials under extremely thermal environments.
Keywords:
TiB2/MgAl2O4 ceramic metamaterial
radar-IR-compatible stealth
high temperature
impedance matching
electromagnetic wave attenuation
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