Microstructure and mechanical properties of silicon carbide fiber-reinforced silicon carbide composite fabricated by electrophoretic deposition and hot-pressing

摘要

Colloidal graphite aqueous solution was used as the suspension for carbon coating on the fiber, and carbon layer was formed on SiC fiber by electrophoretic method, and SiC/SiC composite was fabricated by sheet stacking method and hot-pressing. The effect of the concentration of colloidal graphite on mechanical properties of SiC/SiC composite was investigated. Bulk density and open porosity of the composites fabricated in this study were nearly the same, and these values were independent of the concentration of colloidal graphite suspension. The carbon coating on SiC fibers was successfully formed by the electrophoretic deposition method using colloidal graphite suspension. In the case of coating with 0.10mass% of colloidal graphite suspension on SiC fibers, relatively uniform carbon coating on the fibers was observed and large fiber pullout occurred effectively during fracture.