Preparation for 2D-C/C composites with pure RL textures and its characteristic

A 2D carbon fiber preform (bulk density 0.43 g/cm³) was infiltrated by novel ICVI in temperature 1080-1200°C, pressure 10 KPa, gas residence time 0.01 s, using natural gas as carbon source, N₂ as diluent gas, and the C/C composites were obtained. The flexural strength was measured by three-point bonding tests, the microstructures of pyrocarbon matrix and the morphologies of fractured surfaces were observed by polarized light microscopy (PLM) and scanning electron microscopy (SEM). The results show that the bulk density of 2D-C/C composites manufactured in 150 h is 1.75 g/cm³, its texture is pure rough laminar, flexural strength and flexural modulus are 164.77 MPa and 21.34 GPa respectively. The fracture of C/C composites exhibits a pseudo-plastic failure behavior.