Structure Evolution of 3D Needled C-C-SiC Composites Prepared by Reactive Melt InfiltrationReport as inadecuate




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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.

KEYWORDS

C-C-SiC composites; reactive melt infiltration; microstructure

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Author: Li Yin, Dong-lin Zhao, Zeng-min Shen

Source: http://www.scirp.org/



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