Wear mechanism of fretted CoMoCrSi coatings

Coatings based on CoMoCrSi alloys are commonly applied on the damping surfaces of turbine blades, particularly in aero engines. The reason is the mitigation of the wear. If severe wear occur, the effectiveness of the damping effect could be decreased. Therefore, the vibration increase and the life of blade decrease. These mating surfaces are usually stressed with reciprocating relative displacement in dry condition with low amplitude. In other word, the damping surfaces are usually fretted. This study investigates the wear mechanism at the contact damping interfaces coated by Tribaloy® T-800.