Microstructure and mechanical property of Cf/SiC core/shell composite fabricated by direct ink writing

A novel approach for the fabrication of Short carbon fibers reinforced SiC ceramic composites filaments with core-shell microstructure by direct ink writing was firstly proposed. A novel core-shell feed rod for co-extrusion was designed. Fiber interface layer was prepared by precursor infiltration pyrolysis with polycarbosilane. The results indicated that the ratio (d/D) of carbon fiber (core) to SiC (shell) could be controlled effectively. The debonding and fracture of short fibers with high orientation might improve the fracture resistance of the Cf/SiC composite. The filament-based specimens with strength of ~123 MPa and porosity of ~31% (d/D = 0.6) were successfully fabricated.