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Aqueous-Oxygen Corrosion Damage of 2.5D Braided SiC_f/SiC Composites Prepared by CVI+PIP Processing: Multidimensional Observation and Mechanism Analysis

Zhang Lin, Zhang Lin, Li Junsheng, Chen Sian, Zhang Yanhu, Wan Fan

Journal of Ceramic Science and Technology, Vol. 17, No. 1 (2026), pp. 39-52

DOI: 10.4416/JCST2025-00006

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Abstract

X-ray computed tomography (XCT) was utilized to perform quantitative and qualitative characterizations of aqueous-oxygen corrosion evolution in SiCf/SiC composites under pre- and post-oxidation conditions. The results indicate that the SiC matrix formed with the precursor impregnation and pyrolysis (PIP) method is located mainly in the inter-bundle region, which experiences significant oxidation after 160 hours of oxidation. This oxidation results in the formation of SiO2 that fills the inter-bundle pores, leading to a decrease in porosity from an initial 10.9 % to 6.8 %. The interconnected inter-bundle pore network facilitates the ingress of oxygen, resulting in corrosion damage that is initiated preferentially at pore periphery regions. Progressive aqueous-oxygen corrosion leads to pore channel narrowing with surface smoothening, accompanied by the formation of vesicular porosity along the specimen periphery. A connected sheet-like and layered oxide skeleton structure forms finally because of the corrosion of matrix in the inter-bundle region.

Keywords

X-ray computed tomography (XCT), SiCf/SiC composites, high-temperature aqueous-oxygen, oxidation mechanism.

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