Abstract
This investigation intended to assess the influence of SiC morphology on the sinterability and physical-mechanical features of TiB2-SiC composites. For this aim, different volume percentages of SiC particles and SiC whiskers were introduced to TiB2 samples hot-pressed at 1950 °C for 2 h under an external pressure of 25 MPa. The characterization of as-sintered specimens was carried out using X-ray diffraction, optical microscopy, and scanning electron microscopy. The relative density studies revealed that SiCw had a more significant impact on the sinterability of TiB2-based composites. The XRD investigation confirmed the production of an in-situ TiC phase during the hot-pressing; however, some peaks related to the graphitized carbon also appeared in the patterns of SiCw-doped ceramics. The addition of 25 vol% SiCp halved the average grain size of TiB2 while introducing the same content of SiCw decreased this value by just around 20%. Finally, the highest Vickers hardness and fracture toughness were obtained for the sample reinforced with 25 vol% SiCw, standing at 29.3 GPa and 6.1 MPa m1/2, respectively.
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