Preparation and Property Study of 3D Cf/Si-Ti-C-O Composites Fabricated with Polytitanocarbosilane by PIP Process
In this paper, 3D Cf/Si-Ti-C-O composites were prepared with a polytitanocarbosilane (PTC) via polymer infiltration and pyrolysis (PIP) process, and accordingly the mechanical, oxidation resisting and thermal shock resisting properties were investigated. The composites with density of 1.93g·cm-3 show rather high flexural strength (485.3MPa) and fracture toughness (19.95MPa⋅m1/2), and typical non-brittle fracture failure mode. After oxidation treatment at 1300°C for 10 minutes in air, the flexural strength of the samples is 306.2MPa, with 63% strength retention. After 5 times of thermal shock tests from room temperature to 1300°C, the flexural strength of the samples is 408.9MPa, about 85% strength retention. SEM observation also testifies non-brittle failure because many fibers are pulled out on the fracture surface. After oxidation treatment, the matrix shows no changes from XRD measurement.
Wei Pan and Jianghong Gong
Q. K. Wang et al., "Preparation and Property Study of 3D Cf/Si-Ti-C-O Composites Fabricated with Polytitanocarbosilane by PIP Process", Key Engineering Materials, Vols. 336-338, pp. 1242-1244, 2007