Composites based on TiB2–SiC with a nickel–chromium matrix

New TiB 2 –SiC composite materials with a nickel–chromium matrix are obtained. The process parameters of hot pressing of these advanced materials are optimized and their structure and mechanical properties are studied. The tribotechnical parameters and wear mechanism of these composites are established. The wear mechanism consists in the formation of TiO 2 –B 2 O 3 –SiO 2 protective films on friction surfaces. It is shown that the amount of the metal matrix (Ni–20 % Cr) influences the thickness of oxide films and, hence, the wear rate. The composite with 40 % metal matrix has high wear resistance owing to the formation of a protective film with the optimal thickness (120 nm) on friction surface.