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<p>Developing continuous ceramic fibers capable of serving in extreme thermal and oxidative environments while possessing tunable electrical functionality remains a critical challenge for next-generation aerospace applications. In this study, structure–function integrated SiC (Ti) fibers were successfully fabricated via a precursor-derived ceramic (PDC) route, utilizing a synthesized low-oxygen polytitanocarbosilane (PTCS). Through precise regulation of the titanium content, we constructed a stable “micro-composite” architecture, wherein in situ generated TiC nanocrystals serve as conductive pinning nodes embedded within a turbostratic carbon network. The optimized fibers exhibit a dense microstructure with a tensile strength reaching 1.49&#xa0;GPa. Notably, benefiting from the formation of a self-healing dense SiO<sub>2</sub>–TiO<sub>2</sub> oxide scale, the fibers retain 84% of their tensile strength after exposure to air at 1300&#xa0;°C for 1h, demonstrating exceptional high-temperature stability. Furthermore, this synergistic TiC-C percolation network endows the fibers with a stable and tunable electrical resistivity (0.3–0.9&#xa0;Ω⋅cm) even after heat treatment at 1800&#xa0;°C. The superior high-temperature electrical stability is primarily attributed to the synergistic effect between the carbon-rich structural characteristics in the near-surface region and the conductive TiC network along grain boundaries. This work provides an effective strategy for developing structure–function integrated SiC fibers suitable for extreme environments.</p>

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Enhanced high-temperature stability and tunable electrical resistivity of SiC fibers via titanium incorporation

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Meiqi Wang,
  • Shixin Ren,
  • Jianjun Chen,
  • Defeng Hu,
  • Peng Zhu,
  • Zhanjun Wang

摘要

Developing continuous ceramic fibers capable of serving in extreme thermal and oxidative environments while possessing tunable electrical functionality remains a critical challenge for next-generation aerospace applications. In this study, structure–function integrated SiC (Ti) fibers were successfully fabricated via a precursor-derived ceramic (PDC) route, utilizing a synthesized low-oxygen polytitanocarbosilane (PTCS). Through precise regulation of the titanium content, we constructed a stable “micro-composite” architecture, wherein in situ generated TiC nanocrystals serve as conductive pinning nodes embedded within a turbostratic carbon network. The optimized fibers exhibit a dense microstructure with a tensile strength reaching 1.49 GPa. Notably, benefiting from the formation of a self-healing dense SiO2–TiO2 oxide scale, the fibers retain 84% of their tensile strength after exposure to air at 1300 °C for 1h, demonstrating exceptional high-temperature stability. Furthermore, this synergistic TiC-C percolation network endows the fibers with a stable and tunable electrical resistivity (0.3–0.9 Ω⋅cm) even after heat treatment at 1800 °C. The superior high-temperature electrical stability is primarily attributed to the synergistic effect between the carbon-rich structural characteristics in the near-surface region and the conductive TiC network along grain boundaries. This work provides an effective strategy for developing structure–function integrated SiC fibers suitable for extreme environments.