Current-carrying friction and wear characteristics of TiC/Ti₃SiC₂ composites under high speed by infiltration sintering

TiC/Ti₃SiC₂ composite material was prepared by infiltration sintering technology, the investigation was conducted on a HST-100 pin-on-disc friction and wear testing machine in the speed range of 60-90 m/s. The results show that the friction and wear behavior of TiC/Ti₃SiC₂ is closely related with the sliding speed and TiC content against HSLA80 pairs. When the sliding speed is slower than 80 m/s, the worn surface characterized by groove-ridge, Pan furrows and their combined to pography, uniform oxidation film (FeTiO₃ and Fe_2.35Ti_0.65O₄) will be formed on the surface, and the main wear mechanisms are abrasive wear, oxidation wear and adhesive wear. However, When the sliding speed is faster than 80 m/s, the worn surface characterized by isolated peak pattern, discontinuous and non-uniform oxidation film is formed. Wear mechanism is mainiy arc oxidation. Under the same experiment conditions, the coefficient of friction increases and the wear rate decreases with the content increase of TiC content.