FOREIGN OBJECT DAMAGE (FOD) BEHAVIOR OF EB-PVD THERMAL BARRIER COATINGS (TBCs) IN AIRFOIL COMPONENTS

摘要

A series of foreign-object-damage (FOD) tests on ceramic thermal barrier coatings (TBCs) of aeroengine airfoil components were performed to determine their responses to ballistic particle impact. Airfoils coated with electron beam, physical vapor deposition (EB-PVD) TBCs were FOD-tested by 1.6 mm-diameter spherical projectiles of two different materials of borosilicate glass and silicon nitride. A range of impact velocities from 150 to 300 m/s was employed for each of projectile materials. Degree and morphologies of impact damage were quantified and characterized in terms of impact velocity, projectile material, and component service-life. A first-order approximation of impact force was made based on the energy balance principle and the 'contact yield pressure' analysis.