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Author(s): |
Li Yin, Key Laboratory of carbon fiber and functional polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing
Dong-lin Zhao, Key Laboratory of carbon fiber and functional polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing
Zeng-min Shen, Key Laboratory of carbon fiber and functional polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing |
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Abstract: |
Three-dimensional (3D) needled C/C-SiC composites were prepared by reactive melt infiltration (RMI). The structure evolution of 3D needled C/C-SiC composites prepared by RMI has been investigated. The microstructure and composition of C/C and C/C-SiC composites infiltrated by the liquid silicon were investigated by SEM, X-ray diffraction (XRD) and energy dispersive x-ray analysis (EDAX). The results indicated that the mesophase pitch based carbons in the C/C composites were mainly filled in the fiber bundles, and the matrix carbon presented laminated structure. In addition, some closed pores in C/C composites were opened when liquid silicon infiltrated at high temperatures, which acted as the channel for silicon infiltration, and the density of composites was greatly enhanced. The voids near the carbon fibers were partly destroyed due to the silicon remained in the voids of the composites. Some carbon fibers inside the fiber bundles were slightly damaged by liquid silicon, which could reinforce the C/C-SiC composites.
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