Carbon/Carbon Composites Preparation by Novel Technology and Its Characteristic

In order to enhance densification efficiency and decrease the costs of preparation,a novel isothermal chemical vapor infiltration process for fabrication C/C composites was developed by decreasing the space of around preforms in the conventional hot wall reactor.With volume fraction of 28.7%,and infiltrated by the novel ICVI at ambient pressure and 1100℃,residence time of 0.1s,and methane as precursor,nitrogen as diluted gas,the 2D fiber felt preform was densified. The texture of the obtained sample was investigated by using a polarized light microscope and the flexural stength was determined by three-point bonding tests,after the tests,the morphology of the fracture surface was observed by using SEM.The resuts show that the bulk density of the C/C composite prepared in 125h is 1.73g/cm~3,and the density distribution is uniform.Its texture is pure rough laminar.Its flexural strength is 250.87MPa.Its flexural modulux is 29.29GPa.The C/C composite exhibits a pseudo-plastic failure behavior.