Preparation and Characterization of Porous Si-Coated SiC Fiber Media

초록

SILCOMP process, a well-known method of consolidation Si/SiC composites, utilizes carbon fiber rather than carbon powder as a source of elemental carbon [1,2]. The SILCOMP process uses carbon fibers in the form of tow, cloth, felt or yarn to bulid up complex shapes of preform by any of the methods used to make fiber-reinforced polymer matrix composites. In this study based on infiltration techniques similar to SILCOMP process, electrically conductive porous Si/SiC fiber composites were prepared by infiltration of liquid silicon into porous carbon fiber composites followed by partial elimination of residual silicon. The electrical properties of the resulting Si-coated SiC fiber composites were interpreted in terms of the fraction of residual Si phase and porosity.