Component and methods of fabricating and coating a component

A component comprising

• a substrate comprising an outer surface and an inner surface, wherein the inner surface defines at least one hollow, interior space, wherein the outer surface defines one or more grooves, wherein each of the one or more grooves extends at least partially along the surface of the substrate and has an opening defined at an outer surface of the substrate and a base, wherein one or more access holes extend through the base of a respective one of the one or more grooves to place the groove in fluid communication with respective ones of the at least one hollow interior space;
• and
• a coating disposed over at least a portion of the surface of the substrate, wherein the coating comprises two or more layers, wherein at least one of the layers comprises a structural coating having a non-homogenous microstructure and defines one or more permeable slots, such that the structural coating does not completely bridge each of the one or more grooves, and wherein the grooves and the coating together define one or more channels within the substrate for cooling the component.

A component comprising

• a substrate comprising an outer surface and an inner surface, wherein the inner surface defines at least one hollow, interior space, wherein the outer surface defines one or more grooves, wherein each of the one or more grooves extends at least partially along the surface of the substrate and has an opening defined at an outer surface of the substrate and a base, wherein each groove narrows at the opening of the groove and thus comprises a re-entrant shaped groove, wherein one or more access holes extend through the base of a respective one of the one or more grooves to place the groove in fluid communication with respective ones of the at least one hollow interior space;
• and
• a coating disposed over at least a portion of the surface of the substrate, wherein the coating comprises one or more layers, wherein at least one of the layers comprises a structural coating having a non-homogenous microstructure and defines one or more permeable slots, such that the coating does not completely bridge each of the one or more grooves, and wherein the grooves and the coating together define one or more channels within the substrate for cooling the component.