Low friction heating
Frictional heating between the ceramic balls and the steel rings is less; further positively affect the maximum running speed.
Centrifugal Load: F = -mT2R
Ceramic Balls -> High Speed
Because the density of silicon nitride is 60% of steel, the centrifugal load is reduced by using these balls with 60%. As a consequence the running speed can be increased up to 30%.
Hybrid bearings need to be oil lubricated just like steel bearings. Lubrication can be omitted with very low running speed and if a short lifetime suffices. In complete ceramic bearings water lubrication or process lubrication suffices.