Journal of Inorganic Materials

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Microwave Absorption Performance and Thermal Stability of V-doped Ti3AlC2

CHANG Yukai1, CHAI Pengbo1, CAI Yining1, HUO Yingjie2, LIU Wei3, SUN Xiaohui1, ZHOU Aiguo   

  1. 1. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China;
    2. School of Physical Science and Technology, Tangshan Normal University, Tangshan 063009, China;
    3. Jiaozuo Jinchuan Electronic Technology Co., Ltd., Jiaozuo 454003, China
  • Received:2026-06-26 Revised:2026-09-09
  • Contact: SUN Xiaohui, lecturer. E-mail: xiaohuisun@hpu.edu.cn; ZHOU Aiguo, professor. E-mail: zhouag@hpu.edu.cn
  • Supported by:
    National Natural Science Foundation of China (52202364, 52372284); Natural Science Foundation of Henan (262300420004); Fundamental Research Funds for Henan Polytechnic University (NSFRF2602023); Henan Central-Guided Local S&T Development Fund (Z20241471061)

Abstract: Ti3AlC2, a representative MAX-phase material, possesses high electrical conductivity and excellent thermal stability, making it a promising candidate for electromagnetic wave absorption. However, its excessively high conductivity readily causes impedance mismatch and hinders effective penetration of incident electromagnetic waves. In this study, transition metal V was introduced into Ti3AlC2 to regulate its lattice and electronic structures by taking advantage of the similar atomic characteristics of V and Ti. (Ti0.7V0.3)3AlC2 was selected as a representative composition to investigate its structural characteristics, electromagnetic parameters, microwave absorption performance, and property evolution after high-temperature treatment. The results show that V doping preserves the MAX-phase framework of Ti3AlC2 while markedly enhancing its microwave absorption performance. Compared with pristine Ti3AlC2, V doping effectively regulates the dielectric response and improves impedance matching. Consequently, the minimum reflection loss is improved from -9.13 to -51.48 dB at a matching thickness of only 1.60 mm, with a maximum effective absorption bandwidth of 2.24 GHz. After heat treatment at 600 ℃ followed by cooling to room temperature, the sample undergoes surface oxidation, accompanied by decreases in dielectric loss and attenuation capability. Nevertheless, its minimum reflection loss remains as low as -46.96 dB, indicating that appreciable room-temperature microwave absorption performance is retained after high-temperature treatment. V doping therefore enhances the microwave absorption of Ti3AlC2 through the coordinated regulation of conductive response, polarization loss, and impedance matching, providing an experimental basis for designing MAX-phase absorbers that combine strong microwave absorption with performance retention after heat treatment.

Key words: MAX phase, V doping, microwave absorption, thermal stability

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