Higher speed capability
Silicon nitride balls are less dense and lighter (58 %) than steel balls. This means that the energy requirements for running the machinery will drop - but the main advantage of the low weight is found in a longer bearing life.
The low weight reduces the centrifugal load on the raceway as the bearing spins, and wear and tear significantly reduced, keeping the bearing in top condition for longer. As an added benefit the bearing can operate at much higher RPMs - up to 50 % higher - giving you the possibility of using long-life bearings in demanding high-speed applications, such as machine tool spindles and turbomachinery.