Abstract
Tribological behaviors of Si3N4 ceramic sliding against 316 stainless steel under seawater lubrication were investigated and compared with those under dry sliding and pure water lubrication. The results showed that SiO2 colloidal particles were formed on the rubbing surface of Si3N4 due to the friction-induced chemical reaction of Si3N4 with H2O, which were further aggregated into the silica gel with the assistance of ions in seawater. Because of the boundary lubrication of the silica gel layer, both the lowest friction coefficient and the smallest wear rates of Si3N4 and 316 steel were obtained in seawater.
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