Abstract
In order to enhance the fracture toughness of mullite, three-dimensional braided carbon fiber reinforced mullite (C/mullite) composites were prepared using the Al2O3-SiO2 sol with a high solid content as raw material. Mullitization behavior of the sol was characterized. Then, the microstructure, mechanical properties and oxidation resistance of C/mullite composites were investigated. It is found that the SiO2-rich mullite with desirable sintering shrinkage can be synthesized at 1 300 °C from the sol with an Al203/SiO2 mass ratio of 1:1. The C/mullite composites with a total porosity of 21.5% were fabricated by repeating 18 cycles of vacuum impregnation-drying-heat treatment, showing a flexural strength of 234.5 MPa and a fracture toughness of 13.1 MPa·m1/2. Since carbon fibers were protected by compact matrix, the C/mullite composites show favorable oxidation resistance during 1 200 °C-1 600 °C even if an open porosity of 10.3% was detected.
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Funded by the Science Innovation Foundation of Shanghai Academy of Spaceflight Technology (No. SAST2015043), the Open Foundation of Science and Technology on Thermostructural Composite Materials Laboratory(No.614291102010117), and the National Natural Science Foundation of China (No. 11572277)
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Zhang, W., Ma, Q., Dai, K. et al. Fabrication and Properties of Three-dimensional Braided Carbon Fiber Reinforced SiOa-rich Mullite Composites. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 34, 798–803 (2019). https://doi.org/10.1007/s11595-019-2120-0
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DOI: https://doi.org/10.1007/s11595-019-2120-0