Improvement in the tribological performances of Si3N4, SiC and WC by graphite-like carbon films under dry and water-lubricated sliding conditions

► Si3N4, SiC and WC are good material candidates for components in water. ► GLC films reduce the friction and wear of ceramics under dry-sliding condition. ► GLC films reduce the friction and wear of ceramics in water. ► GLC film on WC exhibits super-low wear in water.