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<p>Si–B–N–O ceramics are promising materials for wave-transparent windows of hypersonic vehicles due to the excellent thermal stability and low dielectric constant. The polymer-derived ceramics (PDC) route is widely adopted for flexible compositional control of the Si–B–N–O covalent ceramics. In this study, a novel borazine-modified polysilazoxane (RBOSZ) was synthesized using trichlorosilane, <i>tert</i>-butanol, trichloroborazine, and ammonia as starting materials. RBOSZ features a Si–N–Si backbone and borazine rings. The Si–B–N–O ceramic was derived from RBOSZ with a ceramic yield of 61 wt% after pyrolysis under nitrogen atmosphere. Boron facilitates the formation of Si<sub>2</sub>N<sub>2</sub>O nanograins at elevated temperatures and enhances the ceramic’s high-temperature stability. By switching nitrogen to ammonia during organic-inorganic transformation, a low-carbon Si–B–N–O ceramic was obtained and retained its amorphous structure up to 1400&#xa0;°C. After annealing at 1600&#xa0;°C, Si<sub>2</sub>N<sub>2</sub>O/β-Si<sub>3</sub>N<sub>4</sub> nanocrystals participated in the Si–B–N–O matrix. This work establishes a facile precursor for high-performance Si–B–N–O ceramics to meet the application demands of heat-resistant wave-transparent windows.</p>

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Preparation and Pyrolytic Transformation of Borazine Modified Polysilazoxane to Low-Carbon Si–B–N–O Ceramics

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Chiyuan Wang,
  • Xin Long,
  • Changwei Shao,
  • Jiawei Huang,
  • Jiaqi Ren

摘要

Si–B–N–O ceramics are promising materials for wave-transparent windows of hypersonic vehicles due to the excellent thermal stability and low dielectric constant. The polymer-derived ceramics (PDC) route is widely adopted for flexible compositional control of the Si–B–N–O covalent ceramics. In this study, a novel borazine-modified polysilazoxane (RBOSZ) was synthesized using trichlorosilane, tert-butanol, trichloroborazine, and ammonia as starting materials. RBOSZ features a Si–N–Si backbone and borazine rings. The Si–B–N–O ceramic was derived from RBOSZ with a ceramic yield of 61 wt% after pyrolysis under nitrogen atmosphere. Boron facilitates the formation of Si2N2O nanograins at elevated temperatures and enhances the ceramic’s high-temperature stability. By switching nitrogen to ammonia during organic-inorganic transformation, a low-carbon Si–B–N–O ceramic was obtained and retained its amorphous structure up to 1400 °C. After annealing at 1600 °C, Si2N2O/β-Si3N4 nanocrystals participated in the Si–B–N–O matrix. This work establishes a facile precursor for high-performance Si–B–N–O ceramics to meet the application demands of heat-resistant wave-transparent windows.