Effect of temperature and sliding speed on the dry sliding behavior of a SiC-graphite composite against martensitic steel

A newly synthesized SiC-graphite composite material was tested against a conventional martensitic stainless steel to evaluate its tribological properties through dry sliding using a pin on disc equipment. The tests were conducted at two velocities of 1.57 m/s and 7 m/s and a constant pressure of 0.5 MPa. The working temperature ranged from room temperature to higher temperatures of 100, 200, 250, 300 up to 400 °C. The friction coefficient increased with increase in temperature for tests conducted at the lower velocity. Conversely, the COF decreased with increase in temperature for high velocity testing condition. When the pin wear was considered, a severe wear was observed for all tests conducted at 1.57 m/s when compared to trials at 7 m/s, where the wear was characterized by mild wear. The analysis of the pin surface revealed that as and when the friction layer was smooth, compact and continuous, the pin wear would appreciably decrease. A bedding procedure was then proposed to attain mild wear even at 1.57 m/s.