Rational Design of a Core-Shelled Ti3AlC2@La2Zr2O7 Composite for High-Temperature Broadband Microwave Absorption

Xinyu Sun; Yaxiong Li; Xiangcheng Li; Pingan Chen; Yingli Zhu

doi:10.1021/acsami.3c12098

Rational Design of a Core-Shelled Ti₃AlC₂@La₂Zr₂O₇ Composite for High-Temperature Broadband Microwave Absorption

ACS Appl Mater Interfaces. 2023 Dec 27;15(51):59895-59904. doi: 10.1021/acsami.3c12098. Epub 2023 Dec 16.

Authors

Xinyu Sun^{1

2}, Yaxiong Li^{1

2}, Xiangcheng Li^{1

2}, Pingan Chen^{1

2}, Yingli Zhu^{1

2}

Affiliations

¹ The State Key Laboratory of Refractories and Metallurgy, Wuhan 430081, China.
² Key Laboratory of High Temperature Electromagnetic Materials and Structure of MOE, Wuhan University of Science and Technology, Wuhan 430081, P.R. China.

PMID: 38102992
DOI: 10.1021/acsami.3c12098

Abstract

Microwave-absorbing materials adapting to high temperatures and harsh environments are in great demand. Herein, a core-shelled Ti₃AlC₂@La₂Zr₂O₇ (TAC@LZO) composite was designed and fabricated by encapsulating the La₂Zr₂O₇ (LZO) thermal insulation ceramic on the surface of highly conductive Ti₃AlC₂ (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.

Keywords: Ti3AlC2@La2Zr2O7 core−shell structure; dielectric properties; high-temperature microwave absorption; interfacial polarization; oxidation resistance.