Abstract: A method includes masking at least one hole of an article with a paste, wherein the hole opens onto a surface of the article, applying a coating to the surface of the article, and removing the paste including contacting the paste with a water containing liquid/environment to dissolve or re-disperse the paste, leaving at least one open hole in the surface of the coated article. The paste includes about 20-80 wt % of a filler material, about 0.5-20 wt % of a hydrogen phosphate compound, about 0.5-15 wt % of a polyhydroxy compound and about 5-25 wt % of water. The filler material has an average particle size in a range of about 0.1-100 microns, and includes a first material which includes alkali metal doped alumina, zirconium oxide, titanium oxide or a combination thereof and a second material which includes a silicate. A weight ratio between the first and second materials is in a range of about 1-10.

Abstract: Coating methods and a coated substrate are provided. The coating method includes providing a component having an aperture formed in a surface thereof, arranging and disposing a hollow member on a portion of the surface to define a hollow space above the aperture corresponding to a shape of the aperture at the surface, applying at least one coating over the surface of the component and the hollow member to form an applied coating having an applied coating thickness, and removing at least a portion of the hollow member to expose the hollow space through the applied coating. The coated substrate includes a component having an aperture formed in a surface thereof, a hollow member arranged and disposed on the surface to define a hollow space above the aperture, and an applied coating over the surface of the component, the hollow space being exposed through the applied coating.

Abstract: A method for coating a component and forming at least one cooling hole in a component is provided. The method includes providing the component having a surface and including a plurality of apertures formed therein. The method includes masking at least one of the plurality of apertures with a plug comprising a removable material. The method includes applying at least one coating to the surface of the component. The method includes eliminating the plug including removable material leaving open apertures in the surface of the coated component. Also provided is a water-soluble aperture plug including water soluble high temperature resistant filler materials including aluminum oxide, zirconium oxide, magnesium oxide, silicon dioxide, zircon, graphite, tungsten carbide, silicon carbide, silicon nitride, boron nitride, aluminum nitrides and binding agents and dispersants including phosphates, silicates, sugar, salt, gum, resin, polyvinyl alcohol (PVA), polyethylene glycol, and combinations thereof.

Abstract: Braze methods include providing a substrate comprising a pre-sintered preform disposed thereon, wherein the pre-sintered preform comprises a mixture comprising a base alloy comprising about 30 weight percent to about 90 weight percent of the mixture and a second alloy comprising a sufficient amount of melting point depressant to have a lower melting temperature than the base alloy. Braze methods further include at least partially covering the pre-sintered preform with a heat resistant material, wherein a melt temperature of the heat resistant material is higher than a melt temperature of the pre-sintered preform, and heating the pre-sintered preform on the substrate.

Abstract: Modified turbine components include an original turbine component comprising an outer wail enclosing an internal cavity, wherein the outer wall has an original portion removed therefrom to expose the internal cavity, and, an internally cooled supplemental element joined to the outer wall that replaces the original portion removed from the outer wall and re-encloses the internal cavity. The internally cooled supplemental element comprises one or more cooling channels that circulate air from the internal cavity through at least a portion of the internally cooled supplemental element.

Abstract: A method for coating a component is provided. The coating method includes providing a component having at least one aperture with an aperture geometry formed in a surface thereof, positioning a filler material within the at least one aperture, the filler material extending away from the surface of the component a distance greater than a reduced coating thickness and less than an applied coating thickness, applying at least one coating over the surface of the component and the filler material to form an applied coating having the applied coating thickness, removing a portion of the applied coating to provide the reduced coating thickness and expose the filler material, and removing the filler material to extend the at least one aperture having the aperture geometry through the applied coating. Another coating method and a template for use with the coating methods are also provided.

Abstract: Methods for selective localized coating deposition for a turbine component include providing the turbine component comprising an exterior surface with one or more surface features and selectively coating at least a portion of the exterior surface using a localized coating deposition apparatus based on a location of at least one of the one or more surface features.

Abstract: Braze methods include providing a substrate comprising a pre-sintered preform disposed thereon, wherein the pre-sintered preform comprises a mixture comprising a base alloy comprising about 30 weight percent to about 90 weight percent of the mixture and a second alloy comprising a sufficient amount of melting point depressant to have a lower melting temperature than the base alloy. Braze methods further include at least partially covering the pre-sintered preform with a heat resistant material, wherein a melt temperature of the heat resistant material is higher than a melt temperature of the pre-sintered preform, and heating the pre-sintered preform on the substrate.

Abstract: Coating methods and a coated substrate are provided. The coating method includes providing a component having an aperture formed in a surface thereof, arranging and disposing a hollow member on a portion of the surface to define a hollow space above the aperture corresponding to a shape of the aperture at the surface, applying at least one coating over the surface of the component and the hollow member to form an applied coating having an applied coating thickness, and removing at least a portion of the hollow member to expose the hollow space through the applied coating. The coated substrate includes a component having an aperture formed in a surface thereof, a hollow member arranged and disposed on the surface to define a hollow space above the aperture, and an applied coating over the surface of the component, the hollow space being exposed through the applied coating.

Abstract: A system including: a masking applicator; and at least one computing device coupled with the masking applicator, the at least one computing device configured to provide instructions to the masking applicator to apply a masking material according to a masking plan for masking at least one cooling aperture in a turbomachine component during a cooling aperture coating process, the masking plan based upon at least one characteristic of the plurality of cooling apertures, the masking plan including masking the at least one cooling aperture using a first mask type.

Abstract: Modified turbine components include an original turbine component comprising an outer wail enclosing an internal cavity, wherein the outer wall has an original portion removed therefrom to expose the internal cavity, and, an internally cooled supplemental element joined to the outer wall that replaces the original portion removed from the outer wall and re-encloses the internal cavity. The internally cooled supplemental element comprises one or more cooling channels that circulate air from the internal cavity through at least a portion of the internally cooled supplemental element.

Abstract: A method for coating a component and forming at least one cooling hole in a component is provided. The method includes providing the component having a surface and including a plurality of apertures formed therein. The method includes masking at least one of the plurality of apertures with a plug comprising a removable material. The method includes applying at least one coating to the surface of the component. The method includes eliminating the plug including removable material leaving open apertures in the surface of the coated component. Also provided is a water-soluble aperture plug including water soluble high temperature resistant filler materials including aluminum oxide, zirconium oxide, magnesium oxide, silicon dioxide, zircon, graphite, tungsten carbide, silicon carbide, silicon nitride, boron nitride, aluminum nitrides and binding agents and dispersants including phosphates, silicates, sugar, salt, gum, resin, polyvinyl alcohol (PVA), polyethylene glycol, and combinations thereof.