Metallic article having a thermal barrier coating and a method of application thereof

摘要

A metallic article includes a bond coating and a ceramic thermal barrier coating on the bond coating. The ceramic thermal barrier coating includes a plurality of columnar grains, which extend perpendicularly to the surface of the metallic article. Each columnar grain includes a plurality of layers. Some of the layers include sub-grains extending at an acute angle to the surface of the metallic article to form voids between adjacent sub-grains. The voids are arranged at an acute angle to the surface of the metallic article and reduce the thermal conductivity of the ceramic thermal barrier coating. Some of the layers include sub-grains extending perpendicularly to the surface of the metallic article to provide erosion resistance.