Borides,including TiB2,ZrB2,HfB2,B4C and BN,have good physical and chemical properties,which have been proposed for a variety of applications in extreme environments,such as ultra-high temperature,super-hard and super-hydrophobic.However,the engineering applications of these borides are still restricted by their poor sinterability and unsatisfied material properties including low fracture toughness.In regard with the advantages of pressureless sintering in preparation of ceramics,the main factors that affec...