Advanced Blade-Damping Coatings

The object of Phygen’s proposal is to demonstrate the dual use (damping and erosion) capabilities of a physical vapor deposited coating for titanium airfoils using a novel graded interface approach. The proposed coating builds on previous government and aircraft engine company support which demonstrated modest high frequency damping up to 700F using only a thin (~40um) lightweight and highly adherent Sn,MgO+Cr damping layer. Improved damping response will be addressed by increasing the thickness to ~125um without effecting aerodynamic performance and good surface finish. Current plasma sprayed mag spinel coatings provide similar damping with coating thickness of >3-6 times greater. The proposed coating will additionally provide erosion and corrosion resistance from developed dense outer layers of TiC/CrN thus permitting a potential triple use capability. Adherence, damping, high cycle fatigue, and sand erosion resistance measurements will be measured to compare the developed coatings with previous benchmarked systems.