J. Mater. Sci. Technol. ›› 2022, Vol. 130: 249-255.DOI: 10.1016/j.jmst.2022.04.050

• Research Article • Previous Articles     Next Articles

TiN/BN composite with excellent thermal stability for efficiency microwave absorption in wide temperature spectrum

Yupeng Shia,b, Dan Lia,b, Haoxu Sib, Zhiyang Jianga,b, Mengyuan Lia,b, Chunhong Gonga,b,*()   

  1. aInstitute of Functional Polymer Composites, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
    bNational & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng 475004, China
  • Received:2022-04-08 Revised:2022-04-28 Accepted:2022-04-29 Published:2022-12-10 Online:2022-12-07
  • Contact: Chunhong Gong
  • About author:∗ E-mail address: gong@henu.edu.cn (C. Gong)

Abstract:

High-efficiency and temperature-insensitive microwave absorbing materials (MAMs) are ideal for high-temperature electromagnetic attenuation. Herein, the titanium nitride/boron nitride (TiN/BN) composite with TiN as the loss unit and BN as the impedance matching unit has been constructed by the in-situ synthesis method. The insulating BN not only effectively regulates and optimizes the conductivity and impedance matching of the material but also imparts steady cyclic microwave absorption properties. The steady dielectric loss ensures that TiN/BN composite has robust high-temperature absorption properties at X-band, with a minimum reflection loss (RLmin) of −16.74 dB at 873 K and an effective absorption bandwidth (EAB) of 3.26 GHz in the temperature range of 293-873 K. Compared with the TiN/SiO2 absorbers with a single system, the TiN/BN/SiO2 composite keeps reliable high temperature absorbing properties at 873 K. This work confirms that wave-transparent materials for dielectric property modulation can resolve poor temperature stability of effective absorption and non-reusability for high-temperature absorbing materials, providing inspirations for designing efficiency high-temperature microwave absorbers.

Key words: TiN/BN, High-temperature, Microwave absorption, Dielectric properties, Impedance matching