| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Oxidation and Thermal Shock Behaviors of C/Mullite Composites Based on a Sol with High Soild Content |
| ZHANG Wei1,2, MA Qingsong1,*, ZENG Kuanhong1, WANG Weide1, MAO Weiguo2,*
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1 Science and Technology on Advanced Ceramic Fibers & Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
2 College of Materials Science and Engineering, Changsha University of Science & Technology, Changsha 410114, China |
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Abstract Owing to the reinforcement and toughening of carbon fibers, carbon fiber reinforced mullite (C/mullite) composites have found broad applicative prospect as thermal-structural materials in the field of aeronautics and astronautics. In order to further clarify the failure behavior of C/mullite composites in service conditions, the oxidation behavior of a C/mullite composite at 1 300 ℃ and thermal shock behavior of the composites at 1 300—1 500 ℃ were investigated systematically in the present work. The results indicated that the composite showed increased weight loss and decreased mechanical properties as the oxidation time was elevated to 1 300 ℃, which could be ascribed to the poor viscous flow effect of SiO2 on the surface of the composite. Under the coupling effect of oxidation-heating alternations, the mechanical properties of the C/mullite composite subjected thermal shock at 1 300 ℃ for 10 cycles (with a total oxidation duration of about 50 min) were found to be significantly lower than that of the composite experienced oxidation at 1 300 ℃ for 60 min. Furthermore, the enhanced viscous flow effect of SiO2 on the surface of C/mullite composite at 1 500 ℃ led to inconspicuous difference in weight loss and mechanical properties between the composites subjected to thermal shock at 1 400 ℃ and 1 500 ℃.
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Published: 10 October 2025
Online: 2025-09-24
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