Fabrication of carbon fiber reinforced ceramic matrix composites with improved oxidation resistance using boron as active filler |
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Authors: | Zhen Wang Shaoming Dong Ping He Le Gao Haijun Zhou Jinshan Yang Dongliang Jiang |
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Affiliation: | 1. Univ. Limoges, CNRS, IRCER, UMR 7315, F-87000 Limoges, France;2. Chemical Engineering, Federal University of Santa Catarina, 88010-970 Florianópolis, Brazil;3. IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM), Universite Montpellier, Place E. Bataillon, F-34095 Montpellier, France |
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Abstract: | Boron was introduced into Cf/SiC composites as active filler to shorten the processing time of PIP process and improve the oxidation resistance of composites. When heat-treated at 1800 °C in N2 for 1 h, the density of composites with boron (Cf/SiC-BN) increased from 1.71 to 1.78 g/cm3, while that of composites without boron (Cf/SiC) decreased from 1.92 to 1.77 g/cm3. So when boron was used, two cycles of polymer impregnation and pyrolysis (PIP) could be reduced. Meanwhile, the oxidation resistance of composites was greatly improved with the incorporation of boron-bearing species. Most carbon fiber reinforcements in Cf/SiC composite were burnt off when they were oxidized at 800 °C for 10 h. By contrast, only a small amount of carbon fibers in Cf/SiC-BN composite were burnt off. Weight losses for Cf/SiC composite and Cf/SiC-BN composite were about 36 and 16 wt%, respectively. |
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