$TiB_2$ was synthesized by SHS reaction. Synthesized $TiB_2$ was hot pressed at 1900℃, 25MPa for 1hr using 2 wt%-Ni as a sintering aid. Hot pressed $TiB_2$ using SHS reaction powder was densified upto 97%TD and had a higher strength(540MPa) than samely hot-pressed $TiB_2$ using commercial powder(480MPa). The hot pressed $TiB_2$ using SHS reaction powder showed a relatively fine-grained microstructure.
$TiB_2-B_4C$ composites were fabricated by hot pressing at 1900℃, 25MPa for 1h using SHS reacted $TiB_2$ powder with 2 wt%-Ni as a sintering aid. The addition of $B_4C$ particles yielded a high fracture strength(615MPa at 20 vol%- $B_4C$) and fracture toughness of the composite(5.0 MN/$m^{3/2}$ at 20 vol%-$B_4C$). Improved strength was resulted from fine grain size and intergranular fracture. It was considered that the toughening was ascribed to crack deflection caused by residual stress field which was generated during cooling process due to the difference in thermal expansion coefficient between $TiB_2$ and $B_4C$.