Degradation of CVI 2D SiC/SiC Composites after Heat Treatment in Air at 1250 ℃

doi:10.15541/jim20260299

Abstract

Abstract: Developing SiC/SiC composites reinforced with domestic Cansas 3203 SiC fibers is an important technical route for promoting their application in key stationary hot-section components of aero-engines. Understanding the mechanical degradation behavior of SiC/SiC composites at the upper service temperature of Cansas 3203 SiC fibers (1250 °C) is essential for guiding the structural design and service-life assessment of hot-section components. This study focused on 2D SiC/SiC composites fabricated by chemical vapor infiltration, systematically analyzed their mechanical degradation behavior after heat treatment in air at 1250 °C, and discussed oxidation-damage sensitivity under different loading modes based on changes in retention rates. Results show that, after long-term heat treatment in air at 1250 °C, different mechanical properties of 2D SiC/SiC composites exhibit distinct degradation behaviors and damage sensitivities. The tensile-strength retention rate decreases to 24.72% after heat treatment in air at 1250 °C for 300 h, while the in-plane shear strength retention rate decreases to 40.07% after 200 h of heat treatment, indicating pronounced cumulative degradation after long-term oxidation. Compressive strength and interlaminar shear strength are more sensitive to initial oxidation damage, with retention rates of 34.50% and 50.43%, respectively, after 100 h of heat treatment, and corresponding values of 49.53% and 62.04% after 300 h of heat treatment. Flexural strength and fracture toughness show retention rates of 78.67% and 74.70%, respectively, after 300 h of heat treatment. After incorporating an equivalent correction coefficient for interfacial load-transfer capability into the residual tensile-strength model, the relative deviations after 200 h and 300 h of heat treatment are 24.18% and -4.06%, respectively. Strength evolution during long-term oxidation is not only controlled by SiC oxide-layer growth but is also associated with reduced interfacial load-transfer capability and composite-scale structural damage. These results provide a mechanical basis under multiple loading modes for the structural design of SiC/SiC stationary hot-section components.

Key words: chemical vapor infiltration, 2D SiC/SiC composites, heat treatment, mechanical properties, degradation behavior

CLC Number:

TB332

GAO Yifei, YOU Bojie, WANG Yujin, GAO Xiangyun, ZHOU Xinyue, ZHANG Yi. Degradation of CVI 2D SiC/SiC Composites after Heat Treatment in Air at 1250 ℃[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20260299.

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