J. Mater. Sci. Technol. ›› 2025, Vol. 223: 11-21.DOI: 10.1016/j.jmst.2024.10.021

• Research article • Previous Articles     Next Articles

From molecular precursors to ultra-high temperature ceramics: A novel synthesis of hafnium carbonitride nanoceramics

Xue Lia, Yulei Zhanga,b,*, Yanqin Fub,*, Junhao Zhaoa, Jiachen Menga   

  1. aState Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Fiber Reinforced Light-Weight Composites, Northwestern Polytechnical University, Xi'an 710072, China;
    bHenan Key Laboratory of High Performance Carbon Fiber Reinforced Composites, Institute of Carbon Matrix Composites, Henan Academy of Sciences, Zhengzhou 450046, China
  • Received:2024-08-17 Revised:2024-10-08 Accepted:2024-10-09 Published:2025-07-10 Online:2024-11-13
  • Contact: *E-mail addresses: zhangyulei@nwpu.edu.cn (Y. Zhang), fuyanqin@hnas.ac.cn (Y. Fu)

Abstract: Hafnium carbonitride (HfCxN1-x) ceramics have drawn considerable interest due to their exceptional mechanical and thermophysical properties. Herein, we report a novel single-source precursor with Hf-N bonds as the main chain and fabricate HfCxN1-x ceramics after pyrolysis of the precursor. The synthesis, ceramic conversion, and microstructural evolution of the single-source precursor as well as the derived HfCxN1-x ceramics treated under various atmospheres were investigated. The results indicate that in an argon atmosphere, the nitrogen content within HfCxN1-x decreases with rising temperature. While under a nitrogen atmosphere, the high concentration of N2 facilitates the rapid conversion of HfO2 to Hf7O8N4, which subsequently promotes the transformation of the HfCxN1-x solid solution ceramics. During this process, there is also an inhibitory effect of N2 on the tendency of HfN into HfC. Moreover, the desired chemical composition of HfCxN1-x can be regulated by adjusting the N2 concentration in the heat treatment atmosphere. The present work proposes a novel strategy for the single-source precursor-derived carbonitride ceramics and provides a deep understanding of the preparation and property modulation of HfCxN1-x ceramics.

Key words: Hafnium Carbonitride, Polymer-Derived Ceramics, High-Temperature Pyrolysis, Nitrogen Atmosphere, Carbon/Nitrogen Thermal Reduction