Small-Angle Oscillatory Performance of Solid-Lubricant Film-Coated Ball Bearings for Vacuum Applications

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Abstract
The purpose of this work is to clarify the oscillatory performances of ball bearing for vacuum application. The friction properties of several solid-lubricant films were examined by using a reciprocating tribometer in a vacuum and in air. Ball bearings lubricated with the same solid-lubricant films were then tested under small-angle oscillatory conditions. Bearing lubricated with Ag + MoS2 show the lowest starting torque and surface damage. This result corresponds to sliding tests results. The damage profile of oscillatory bearings corresponds to the profile of the contact elliptic area. The rolling scars are mainly caused by the differential slip between balls and races.