Performance of Silicon Nitride (Si3N4) Components in Aerospace Bearing Applications

Abstract

Reliability is the most important criteria in aerospace applications. This paper outlines the results of investigations and functional tests performed with hybrid bearings, ceramic bearings in comparison to all-steel bearings, to demonstrate the fatigue behaviour and reliability of silicon nitride components used in rolling bearings. The performance under specific operating conditions such as high speed, blade-loss and oil-off operation is outlined in this paper as well as comparative results of friction torque and bearing temperature.