Wear tests were conducted using a pin-on-disk tribometer to evaluate the effect of disk track diameter on the tribological behavior. High purity alumina balls were used as pins sliding against glass-ceramic (IPS empress 2) disks under distilled water environment. The results showed a substantial increase in the measured wear volume with increasing the disk track diameter from 4 mm to 12 mm, even though the imposed tribological conditions (i.e., load, speed, and sliding distance) were the same. The coefficient of friction also increased as the disk track diameter was increased. Examination of the disk wear tracks by scanning electron microscopy showed that the wear tracks were almost entirely covered with compacted debris layers when a disk track diameter of 4 mm was used. The extent of surface coverage by the interfacial layer was greatly reduced as the disk track diameter was increased to 12 mm. These results are explained based on the ratio of pin contact length to the disk track length that controls the flow and redistribution of the interfacial layer.
Citation: Journal of Tribology-Transactions of the Asme
Pub Type: Journals
alumina balls, distilled water environment, tribological behavior