Fabrication and Properties of 3‐D <scp> <scp>C</scp> </scp> _f / <scp> <scp>SiC</scp> </scp> – <scp> <scp>ZrC</scp> </scp> Composites, Using <scp> <scp>ZrC</scp> </scp> Precursor and Polycarbosilane

Abstract

Three‐dimensional (3‐D) needled C f / ZrC – SiC composites were successfully fabricated by polymer infiltration and pyrolysis combined with ZrC precursor impregnation. The microstructure and mechanical properties of the composites were studied using XRD , SEM and three‐point bending test. The composite with PyC interphase between fiber and matrix had a bulk density of 2.20 g/cm 3 , an open porosity of 13%, and a bending force of 356 N, and exhibited a nonbrittle failure behavior due to propagation and deflection of cracks, and fracture and pullout of fibers. The mass lose and linear recession rate of the 3‐D needled C f / SiC – ZrC composite during oxy‐propane torch test were 0.010 g/s and 0.001 mm/s, respectively. The formation of ZrSiO 4 melt on the surface of the composite contributed mainly the excellent high‐temperature property.