Microwave-assisted synthesis of high-performance TaC nanorods for enhanced electromagnetic wave absorption

作者：Yongqiang Chen, Mao Chen, Haoyuan Lei, Limeng Song, Rui Zhang, Hongxia Li, Mi Tian, Bingbing Fan · 发表于：Journal of Advanced Ceramics · 年份：2025 · DOI：10.26599/jac.2025.9221130 · 被引用次数：54 · 研究领域：Electromagnetic wave absorption materials

One-dimensional tantalum carbide (TaC) nanorods are considered promising candidates for high-temperature electromagnetic wave (EMW) absorption because of their intrinsically high electrical conductivity and exceptional thermal stability. However, conventional synthesis approaches typically yield products with low quality and poor efficiency, limiting their practical applicability. Here, we report the rapid and scalable synthesis of high-quality TaC nanorods via a molten salt-assisted carbothermal reduction strategy integrated with microwave heating. The formation of well-defined one-dimensional TaC nanorods was achieved within 20 min at 1300 °C by precisely tuning the precursor composition (Ta2O5 : C : NaCl : Ni = 1 : 8 : 2 : 0.08). The resulting TaC nanorods exhibit notable EMW absorption properties, with a maximum effective absorption bandwidth (EABmax) of 3.0 GHz at a simulated thickness of 1.0 mm and a minimum reflection loss (RLmin) of −30.5 dB. Off-axis electron holography reveals pronounced charge accumulation at the Ta2O5 shell/TaC core interface, indicative of interfacial polarization effects. Furthermore, radar scattering cross-section (RCS) simulations demonstrate substantial attenuation of the backscattered signal from a perfect electric conductor (PEC) substrate coated with the TaC layer, with the strongest electromagnetic energy dissipation observed at a coating thickness of 1.0 mm. These results underscore the viability of microwave-assisted synthesis as an eff...