Effects of loading rate and temperature on tensile behavior of orthogonal three-dimensional woven Si-Ti-C-O fiber/Si-Ti-C-O matrix composites

摘要

Effects of loading rate and temperature on tensile behavior have been studied in air using two kinds of orthogonal three-dimensional woven Si-Ti-C-O fiber-reinforced Si-Ti-C-O matrix composites, processed by polymer infiltration and pyrolysis (PIP) and chemical vapor infiltration (CVI). Since the interphase and porosity of the two composites are controlled in as similar a manner as possible, the effect of matrix processing method is understood. The strength of the PIP composite is greater than that of the CVI composite at room temperature, but they are almost the same at high temperatures. It was found that the PIP composite is more sensitive to loading rate than the CVI composite due to more glassy phases in the PIP composite.