METHOD FOR CONTROLLING COATING DELAMINATION CAUSED WHEN FORMING COOLING HOLES THROUGH THERMAL BARRIER COATINGS

摘要

A method for reducing defects on a component (105) having at least a substrate (116), a thermal barrier coating layer (112) over the substrate (116), and cooling holes (100) through the substrate and the thermal barrier coating layer (112) is provided. The method includes forming one or more channels (122) in the thermal barrier coating layer (112) about the perimeter of each cooling hole. The one or more channels (122) are effective to reduce crack propagation within the thermal barrier coating layer (112).