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<p>Two-dimensional carbon fiber reinforced silicon oxycarbide (2D C<sub>f</sub>/SiOC) composites were fabricated by preceramic-polymer-based prepreg and multiple polysiloxane impregnation and pyrolysis cycles. The structural and property evolution of SiOC matrices and C<sub>f</sub>/SiOC composites pyrolyzed at various temperatures were examined. Below 1100&#xa0;°C, the SiOC matrix remained amorphous with an incompletely developed network, but exhibited good thermal stability. Phase separation and carbothermal reduction above 1300&#xa0;°C generated abundant amorphous SiC<sub>4</sub> structure units presumably with minor β-SiC formation, leading to optimal thermal stability. At 1500&#xa0;°C, carbothermal reduction and SiC-SiO<sub>2</sub> reactions produced a SiC-dominated matrix with only scarce SiO₂. In C<sub>f</sub>/SiOC composites, pyrolysis at 1300&#xa0;°C (C1300) resulted in the highest flexural strength (83.59&#xa0;MPa), attributed to controlled fiber–matrix interfacial weakening (interphase and/or pre-existing interfacial cracks) that activates the crack deflection and fiber pull-out. Pyrolysis at 1500&#xa0;°C (C1500) enhanced oxidation resistance through the formation of a dense β-SiC interphase surrounding the fibers, despite increased porosity. Overall, 1300&#xa0;°C is identified as the optimal pyrolysis temperature for maximizing mechanical performance, whereas 1500&#xa0;°C is preferable for achieving superior oxidation resistance, underscoring the importance of temperature-specific optimization in PIP-derived C<sub>f</sub>/SiOC composites for targeted applications.</p>

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Effects of carbothermal reduction on microstructure and mechanical properties of PIP-based Cf/SiOC composites

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月22日

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  • Chang Bin Oh,
  • Ji Eun Lee,
  • Byeong-Joo Kim,
  • Man Young Lee,
  • Doo Hyun Choi

摘要

Two-dimensional carbon fiber reinforced silicon oxycarbide (2D Cf/SiOC) composites were fabricated by preceramic-polymer-based prepreg and multiple polysiloxane impregnation and pyrolysis cycles. The structural and property evolution of SiOC matrices and Cf/SiOC composites pyrolyzed at various temperatures were examined. Below 1100 °C, the SiOC matrix remained amorphous with an incompletely developed network, but exhibited good thermal stability. Phase separation and carbothermal reduction above 1300 °C generated abundant amorphous SiC4 structure units presumably with minor β-SiC formation, leading to optimal thermal stability. At 1500 °C, carbothermal reduction and SiC-SiO2 reactions produced a SiC-dominated matrix with only scarce SiO₂. In Cf/SiOC composites, pyrolysis at 1300 °C (C1300) resulted in the highest flexural strength (83.59 MPa), attributed to controlled fiber–matrix interfacial weakening (interphase and/or pre-existing interfacial cracks) that activates the crack deflection and fiber pull-out. Pyrolysis at 1500 °C (C1500) enhanced oxidation resistance through the formation of a dense β-SiC interphase surrounding the fibers, despite increased porosity. Overall, 1300 °C is identified as the optimal pyrolysis temperature for maximizing mechanical performance, whereas 1500 °C is preferable for achieving superior oxidation resistance, underscoring the importance of temperature-specific optimization in PIP-derived Cf/SiOC composites for targeted applications.