The problems connected with producing diamond composites with 30 wt.% of bonding phase in form of. SiC, TiC, and Ti3SiC2 are presented in the paper. Increasing the fraction of the bonding phase within the composite generally helps to reduce internal stresses. Composites were sintered at pressure 8.0+/-0.2 GPa and temperature of 2070 50 K using the Bridgman type high pressure apparatus. Interactions in the diamond-SiC, the diamond-TiC, and the diamond-Ti3SiC2 systems were studied by means of transmission electron microscope (TEM) and X-ray diffraction. Density was measured pyenometrically, The wear resistance studies of these composites were carried out using pin - on disc type laboratory equipment. Hardness was measured with Vickers apparatus. Results of measurements of physical and mechanical properties are reported.