Rational Design of a Core–Shelled Ti<sub>3</sub>AlC<sub>2</sub>@La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> Composite for High-Temperature Broadband Microwave Absorption
Xinyu Sun, Yaxiong Li, Xiangcheng Li, Pingan Chen, Yingli Zhu
Abstract
Microwave-absorbing materials adapting to high temperatures and harsh environments are in great demand. Herein, a core–shelled Ti 3 AlC 2 @La 2 Zr 2 O 7 (TAC@LZO) composite was designed and fabricated by encapsulating the La 2 Zr 2 O 7 (LZO) thermal insulation ceramic on the surface of highly conductive Ti 3 AlC 2 (TAC) via chemical coprecipitation and subsequent heat treatment. The continuous LZO ceramic coating on the surface improved the oxidation resistance of the composite at 600 °C and modulated its dielectric properties. The TAC@LZO composite exhibited an excellent microwave absorption performance within the temperature range of 25–600 °C, minimum reflection loss (RL min ) < −55 dB, and effective absorption bandwidth (EAB, RL < −10 dB) of 4 GHz. This work presents an effective approach for developing stable high-temperature microwave absorbers from thermal insulation ceramics.