Microstructures and Mechanical Properties of SiC-TiB_2 Composite Prepared by Pressureless Sintering

摘要

SiC-TiB_2 composite was prepared at 2298 K by using pressureless sintering. The microstructures and mechanical properties of the SiC-TiB_2 composite were investigated. The SiC-TiB_2 composite with 5 mass % B_4C-C showed the optimized comprehensive properties. The volume density, hardness, flexural strength and fracture toughness of that were 3.43 g/cm~3,18.5 GPa, 353 MPa and 4.67 MPa?m~(1/2), respectively. The excessive B4C-C content might decrease the mechanical properties of the composite.