Abstract
TiB2-TiC-SiC ternary phase ceramics have been prepared by high-gravity activated combustion synthesis using (Ti-Si-B4C) mixing powders. XRD, FESEM and FETEM results show that the ceramic matrix was mainly composed of TiB2, TiC and β-SiC. Uniformly-distributed TiB2 platelets formed the skeleton of ceramics, and irregular TiC and β-SiC solids were embedded between TiB2 platelets. The relative density, Vickers hardness and fracture toughness of the ternary phase ceramics were measured with values of 97.9 %, 22.2 GPa and 10.1 MPa·m0.5. The high-fraction randomly-orientated TiB2 platelets were found to induce continuous crack deflection, and consumed more energy from the crack tip, thereby enhanced the strength and toughness of TiB2-TiC-SiC ceramics.
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