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<p>Investigating the high-temperature creep behavior of continuous silicon carbide fiber reinforced silicon carbide composites (SiC<sub>f</sub>/SiC) is imperative, as sustained thermo-mechanical coupling constitutes the principal failure mechanism affecting structural integrity in hot-end components. The tensile behavior of 2.5D SiC<sub>f</sub>/SiC composites fabricated by the chemical vapor infiltration (CVI) process was investigated at different temperatures; the tensile strength of the composites decreased with increasing temperature. The tensile creep behavior of 2.5D SiC<sub>f</sub>/SiC composites was investigated at 1350&#xa0;°C&#xa0;and 1500&#xa0;°C under creep stresses ranging from 50 to 150&#xa0;MPa; the creep curves of the composites subjected to various stresses at 1350 °C exhibited primary, steady-state, and accelerated creep stages. With increasing stress and temperature, the creep curves gradually exhibited only the steady-state stage. Above 1350 °C, the creep behavior of the composites was primarily governed by the SiC fibers. The composites exhibited greater stress sensitivity at higher temperatures. Creep damage in SiC<sub>f</sub>/SiC composites was primarily attributed to external loading and oxidation of the composite constituents. This study fills a research gap in the performance of 2.5D SiC<sub>f</sub>/SiC composites under extreme conditions. By revealing the transition of creep stages and failure mechanisms under the synergistic effects of high stress and severe oxidation, this work provides essential data for the reliability design of advanced engine components.</p>

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Tensile creep behavior of 2.5D SiCf/SiC composites at elevated temperatures in air

  • 期刊论文

  • 发表日期：

    2026年4月4日

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  • Yuheng Zhang,
  • Yongjin Wei,
  • Zhongyi Fu,
  • Zhong Luo,
  • Shuyuan Zhao,
  • Yuxi Yu,
  • Liuying Huang

摘要

Investigating the high-temperature creep behavior of continuous silicon carbide fiber reinforced silicon carbide composites (SiCf/SiC) is imperative, as sustained thermo-mechanical coupling constitutes the principal failure mechanism affecting structural integrity in hot-end components. The tensile behavior of 2.5D SiCf/SiC composites fabricated by the chemical vapor infiltration (CVI) process was investigated at different temperatures; the tensile strength of the composites decreased with increasing temperature. The tensile creep behavior of 2.5D SiCf/SiC composites was investigated at 1350 °C and 1500 °C under creep stresses ranging from 50 to 150 MPa; the creep curves of the composites subjected to various stresses at 1350 °C exhibited primary, steady-state, and accelerated creep stages. With increasing stress and temperature, the creep curves gradually exhibited only the steady-state stage. Above 1350 °C, the creep behavior of the composites was primarily governed by the SiC fibers. The composites exhibited greater stress sensitivity at higher temperatures. Creep damage in SiCf/SiC composites was primarily attributed to external loading and oxidation of the composite constituents. This study fills a research gap in the performance of 2.5D SiCf/SiC composites under extreme conditions. By revealing the transition of creep stages and failure mechanisms under the synergistic effects of high stress and severe oxidation, this work provides essential data for the reliability design of advanced engine components.