Patent ID: 7220458
Filing Date: 2007-05-22
Classification: C23C,Y10T

Abstract:
1. A method for applying a protective coating on an article, comprising the following steps in the order named: (a) selecting an article with a surface for applying a coating thickness of said protective coating, (b) creating undercut grooves on said article, where said grooves depend beneath said surface to a bottom portion, said grooves having an upper width on said surface and a lower width on said bottom portion connected by side walls, where at least one of said side walls connects said upper width and said lower width to form an undercut angle between said side wall and said surface that is less than 90°, and (c) applying said protective coating onto said article by a technique selected from vapor deposition, thermal spraying, or atomized liquid spray so that said protective coating fills said undercut grooves and covers said surface thereby forming weak paths for stress relief within said protective coating.