You can use ceramic can be achieved without self-lubricating

Bearing seals designed to prevent leakage of the lubricant inside the bearing parts, and to prevent harmful objects outside dust, moisture and foreign matter that penetrates into the bearing, so bearings can be lubricated to the oil in place Analysis of sealed bearings Sealed bearings can be separated from the inner ring and roller assembly and the outer ring with the composition of the cage can be installed separately. Roller and raceway contact at the contact line can be modified to reduce the stress concentration. Tapered roller bearings can withstand high radial and axial load. Because of the tapered roller bearing axial load can only pass one way, therefore, to pass in the opposite direction of the axial load will need to install another with symmetrical Tapered Roller Bearings.
Most of the amount of sealed bearings are single row tapered roller bearings. In the car's front wheels in recent years to spend the small size of the sealed angular contact ball bearing. Four-row tapered roller bearings used in large-scale cold rolling mill and other heavy machines.