Microstructures and Properties of Solidified TiC-TiB2 Composites Prepared by Combustion Synthesis in Enhanced High-Gravity Field

Abstract

By taking combustion synthesis to prepare a series of solidified TiC-TiB2composites under the increased high-gravity acceleration from 500g to 2500g, then in the near-full-density composite the ultrafine-grained microstructure with the matrix of TiB2platelets smaller than 1 μm in thickness was achieved, and all TiB2 platelets almost shared in the contributions of bridging and pullout to toughening ceramic, thereby presenting fracture toughness of 16.5 ± 1.0 MP · m0.5and flexural strength of 982 ± 20 MPa.