Fabrication and mechanical behaviors of 2D C/SiC–BCx composite at room temperature
Abstract
C/SiC composite modified with boron carbide (BCx) matrix (entitled: C/SiC–BCx composite) was fabricated by chemical vapor infiltration (CVI). The densification behavior, microstructure, and mechanical behaviors of C/SiC–BCx composite were investigated. The results indicated that the density increase, corresponding with a decreasing porosity when CVI times increase. The density achieves 2.2 g cm−3 with 5% open porosity ratio. Inner fiber bundle, the matrix is SiC. Among fiber bundles, the matrices are composed with multilayer SiC and BCx. The non-brittle flexural fracture behavior was demonstrated and the flexural strength is 442 MPa. The fracture toughness is 22.84 MPa.m1/2. The non-linear tensile behavior was also demonstrated and the strength is 250 MPa. The compressive curve of sample is linear and the strength is 280 MPa. The in-plane shear behavior is also non-linear and shear strength is 160.9 MPa. The inter-laminar shear behavior is linear and the shear strength is 32.5 MPa. All mechanical behaviors of 2D of the C/SiC–BCx composite have been compared with that of the C/SiC composite.