Cf/SiC composite was prepared using 3.5D carbon fiber preform having fibers in 0°, + 60°, and −60° directions along with stitching in the 90° direction. This carbon fiber preform was multilayer interface (PyC/SiC) n = 4 coated using chemical vapor infiltration (CVI) process. The SiC matrix was developed on the multilayer interface-coated carbon preform using polymer impregnation pyrolysis (PIP) process repeatedly. After all the test specimens prepared from the Cf/SiC composite panels of different thickness, the specimens were undergone with SiC seal coating. The mechanical properties such as tensile, flexural, and compressive strength of the Cf/SiC composite were studied, and their values are 78 ± 5 MPa, 158 ± 10 MPa, 191 ± 16 MPa, respectively. The fracture mechanism of the Cf/SiC composite as a result of mechanical tests was analyzed using the optical and scanning electron microscopic images taken on the fractured area of the tested specimens.