Tribology of Titanium Boride Sliding against Silicon Carbide at Elevated Temperatures

摘要

Friction and wear tests of TiB_2 sliding against SiC were conducted without lubricant from room temperature to 1200°C in air and in vacuum. The friction coefficient of the couple of TiB_2/SiC is affected obviously by the oxidation of TiB_2. It increases with the increase of temperature and reaches a maximum at some temperature in air, then decreases remarkably. The friction coefficient of TiB_2/SiC in vacuum exhibites almost a constant and keeps smaller value than that in air. Transition of TiB_2 onto the sliding surface of SiC was observed, which improved the wear resistance of SiC at high temperatures.