Mechanical Properties of Silicon Impregnated C/C Composite Material at Elevated Temperature

摘要

The fracture tests were conducted for silicon impregnated C/C composite material at elevated temperature. Two kinds of carbon fiber orientations were used; one is (0/90) cross ply and the other is (+45/-45) cross ply. The fracture mode of this material is discussed comparing with that of the conventional C/C composite. The fracture surface of silicon impregnated C/C composite material is much smoother than that of C/C composite and the delamination between layers is predominant in the fracture of C/C composite but not in the fracture of silicon impregnated C/C composite material. The tensile strength of (0/90) cross ply C/C composite is much higher than any other specimen.