Composites were prepared on the basis diamond powders of 3-6 um and the TiB2 powders of below 3.5 um. Different amount of TiB2 as a bonding phase changing in range from 10 to 30wt% was used. Compacts in the shape of a disc with dimension 015x5mm were sintered at pressure 8.0+0.2 GPa and temperature of 2230+50 K using the Bridgeman type apparatus. The influence of bonding phase amount on the tested properties was observed. Vickers hardness HV1 was changed in the range from 23.0 to 46.0 GPa and Youngs modulus from 300 to 550 GPa. The highest values of Vickers hardness and Youngs modulus were obtained for diamond composites with 10wt% TiB2 of bonding phase. Microstructural studies using SEM, X-ray and electron diffraction phase analysis were used.
