US Patent 11326469 CMCs with luminescence environmental barrier coatings

An article includes a substrate defining a surface, a bond coat on the surface of the substrate, a coating layer on the bond coat, and a wear indicator. The coating layer includes at least one of an environmental barrier coating (EBC) or an abradable coating. The wear indicator disposed in a first region of the coating layer and includes at least one chromophore dopant and a material of the EBC or the abradable coating. The wear indicator is configured to indicate wear of the coating layer.