Molecular dynamics study of pyrolytic carbon interphase in C _F/C_I preform

The pyrolytic carbon interphase in the C_F/C_I preform was investigated. Two models of the carbon interphase were built on the atomic scale by using Cerius² materials simulation software. The microstructures and bulk or Young's moduli of the two models were investigated by carrying out molecular dynamics annealing simulation in a circulation temperature from 300 to 2073 K. After this, the slippages of the graphite laminas at the edge of the interphase were found. The Young's and bulk moduli of model 1 were reduced more than 10%, the bulk and Young's moduli in direction X of model 2 reduced 20.5% and 16%, respectively, whereas the Young's moduli increased in directions Y and Z by 3.9% and 24.8%. The reasons for these reductions were analysed and the improvement in the properties of these composites caused by these changes was also revealed.