Thermal barrier coating system with improved bond coat

A gas turbine engine component having a thermal barrier coating system on a surface thereof, the coating system comprising:

• a diffusion aluminide bond coat on the surface of the component, the bond coat comprising an additive layer on the surface of the component, a diffusion zone extending into the surface of the component, and a dispersion of oxides located only at and near an outer surface of the additive layer, the oxides comprising an oxide of at least one element not present in a remainder of the bond coat or a substrate region of the component beneath the surface of the component;
• and
• a ceramic layer on the outer surface of the additive layer of the bond coat so that the oxides are concentrated at an interface between the bond coat and the ceramic layer.

A component having a thermal barrier coating system on a surface thereof the coating system comprising:

• a bond coat on the surface of the component, the bond coat containing oxide particles dispersed only at and near an outer surface of the bond coat and on only limited surface regions of the bond coat;
• and
• a ceramic layer on the outer surface of the bond coat.