Oil Lubricated and Water Lubricated Pin-on-Disc Wear Tests with EngineeringCeramics

摘要

Friction and wear tests with ceramics and steels, lubricated with oil and withwater, were carried out using a sliding spherical pin-on-disc geometry. In parallel with the sliding tests, the materials of the specimens were characterized by mechanical testing and physical analysis methods. The ceramics studied were aluminas, ZTA (zirconia toughened alumina), PSZ (MgO -partially stabilized zirconia), silicon carbides and SiAlON. In the oil lubricated tests, the stable coefficient of friction was in the range mu=0.09...0.19 for each of the sliding pairs. The wear rates were generally small and within three orders of magnitude when compared with each other and with steel sliding on steel. For all the material combinations studied, the dominating wear mechanism was a mild polishing of the sliding surfaces. The oil seems to have prevented major chemical interactions from occurring. A minor transfer of steel to alumina and ZTA, and the formation of surface layers on steel pins slid on silicon-based ceramics were, however, observed.