Tensile Strength and Fracture Behavior of Partially Siliconized Carbon-Carbon Composite up to 2273 K

摘要

The tensile behavior of a cross-ply Si infiltrated carbon-carbon (C/C-Si) laminates was examined at room temperature. It was confirmed that unlike the C/C composite, C/C-Si had the non-linear stress-strain curve with one third less strength of C/C composite. After 90% loading of strength, the modulus decreased by 10% against initial modulus. The cross-sectional observation and the observation of the fracture surface by SEM were carried out to determine the fracture mechanism. It was clarified that cracks in C/C-Si propagated from the tip of the process cracks generated after Si infiltration process in 90° ply into the 0° ply to cut the 0 fibers. After the propagation of the process cracks, the cracks progress along the fibers in 0° ply to generate the fiber bundle pull out. These results will help the clarification for the mechanism of C/C-Si in high temperature.