MODIFIED SURFACE AROUND A HOLE

摘要

The layer system (25) has a substrate (4) that is connected with a ceramic exterior layer (10) which is provided with a surface (42). A hole (13) is formed in the exterior layer. A recess portion is formed in the proximity at the hole or directly at a boundary line of the hole in the surface of the exterior layer. The end regions of the recess portion are arranged opposite to each other.