Abstract: A mixture and technique for coating an internal surface of an article is generally described. In one aspect, a method includes introducing a mixture comprising an aluminum source and an organo halocarbon activator into an internal cavity of an article. In some embodiments, the method may further include heating the article and the mixture to a temperature sufficient to form an aluminum halide, which deposits on a surface of the internal cavity to form a coated article. In further embodiments, the method may also include depositing on an external surface of the article a first layer comprising Pt, Si, and a reactive element selected from the group consisting of Hf, Y, La, Ce, Zr, and combinations thereof, and depositing a second layer comprising Al on the first layer to form an alloy including a ?-Ni+??-Ni3Al phase constitution, where the second layer is deposited with the organo halocarbon activator.

Abstract: A method including depositing a powder on a substrate to form a first layer thereon, wherein the layer includes a Pt group metal, Si and reactive element selected from the group consisting of Hf, Y, La, Ce, Zr, and combinations thereof. Deposited on the first layer is a second layer including Al to form a coating with a ?-Ni+???Ni3Al phase constitution. In preferred embodiments, the second layer is deposited with an organo halocarbon activator.

Abstract: In general, the present invention provides coating systems and processes for applying a selected coating system on a metallic substrate. The coating system includes two or more coating layers. A first layer comprises a MCrAl(Y,Hf)-type coating. The MCrAl(Y,Hf) coating is overlaid with a second coating composition that includes a metallic composition different from the MCrAl(Y,Hf) coating composition and includes one or more of: a platinum, silicon containing composition; a platinum, silicon, aluminum containing composition; a platinum, silicon, chromium containing composition; an aluminum, silicon containing composition; and an aluminum, silicon, chromium containing composition; each optionally combined with one or more of chromium, hafnium, lanthanum, manganese, yttrium and mixtures of these metals. Additionally the platinum in the metallic compositions can be exchanged in whole or in part by another noble metal.

Abstract: A mixture and technique for coating an internal surface of an article is generally described. In one aspect, a method includes introducing a mixture comprising an aluminum source and an organo halocarbon activator into an internal cavity of an article. In some embodiments, the method may further include heating the article and the mixture to a temperature sufficient to form an aluminum halide, which deposits on a surface of the internal cavity to form a coated article. In further embodiments, the method may also include depositing on an external surface of the article a first layer comprising Pt, Si, and a reactive element selected from the group consisting of Hf, Y, La, Ce, Zr, and combinations thereof, and depositing a second layer comprising Al on the first layer to form an alloy including a ?-Ni+??-Ni3Al phase constitution, where the second layer is deposited with the organo halocarbon activator.

Abstract: In general, the present invention provides coating systems and processes for applying a selected coating system on a metallic substrate. The coating system includes two or more coating layers. A first layer comprises a MCrAl(Y, Hf)-type coating. The MCrAl(Y, Hf) coating is overlaid with a second coating composition that includes a metallic composition different from the MCrAl(Y, Hf) coating composition and includes one or more of: a platinum, silicon containing composition; a platinum, silicon, aluminum containing composition; a platinum, silicon, chromium containing composition; an aluminum, silicon containing composition; and an aluminum, silicon, chromium containing composition; each optionally combined with one or more of chromium, hafnium, lanthanum, manganese, yttrium and mixtures of these metals. Additionally the platinum in the metallic compositions can be exchanged in whole or in part by another noble metal.

Abstract: A method including depositing a powder on a substrate to form a first layer thereon, wherein the layer includes a Pt group metal, Si and reactive element selected from the group consisting of Hf, Y, La, Ce, Zr, and combinations thereof. Deposited on the first layer is a second layer including Al to form a coating with a ?-Ni+???Ni3Al phase constitution. In preferred embodiments, the second layer is deposited with an organo halocarbon activator.

Abstract: In general, the present invention provides coating systems and processes for applying a selected coating system on a metallic substrate. The coating system includes two or more coating layers. A first layer comprises a MCrAl(Y,Hf)-type coating. The MCrAl(Y,Hf) coating is overlaid with a second coating composition that includes a metallic composition different from the MCrAl(Y,Hf) coating composition and includes one or more of: a platinum, silicon containing composition; a platinum, silicon, aluminum containing composition; a platinum, silicon, chromium containing composition; an aluminum, silicon containing composition; and an aluminum, silicon, chromium containing composition; each optionally combined with one or more of chromium, hafnium, lanthanum, manganese, yttrium and mixtures of these metals. Additionally the platinum in the metallic compositions can be exchanged in whole or in part by another noble metal.

Abstract: In general, the present invention provides coating systems and processes for applying a selected coating system on a metallic substrate. The coating system includes two or more coating layers. A first layer comprises a MCrAl(Y,Hf)-type coating. The MCrAl(Y,Hf) coating is overlaid with a second coating composition that includes a metallic composition different from the MCrAl(Y,Hf) coating composition and includes one or more of: a platinum, silicon containing composition; a platinum, silicon, aluminum containing composition; a platinum, silicon, chromium containing composition; an aluminum, silicon containing composition; and an aluminum, silicon, chromium containing composition; each optionally combined with one or more of chromium, hafnium, lanthanum, manganese, yttrium and mixtures of these metals. Additionally the platinum in the metallic compositions can be exchanged in whole or in part by another noble metal.

Abstract: A method for coating a nickel- or cobalt-based superalloy surface by slurry deposition/heat diffusion. The method includes preparing a slurry of a metal coating powder mixed into an adhesive carrier that will burn off ash-free during a diffusion cycle, depositing the slurry onto the surface of a Ni- or Co-based superalloy material to form a coated surface, and heating the coated surface to a temperature of at least about 1600° F. to diffuse the metal coating powder into the metal substrate.

Abstract: A method for coating a nickel- or cobalt-based superalloy surface by slurry deposition/heat diffusion. The method includes preparing a slurry of a metal coating powder mixed into an adhesive carrier that will burn off ash-free during a diffusion cycle, depositing the slurry onto the surface of a Ni- or Co-based superalloy material to form a coated surface, and heating the coated surface to a temperature of at least about 1600° F. to diffuse the metal coating powder into the metal substrate.

Abstract: A method of controlling the final coating thickness of a diffused aluminide coating on a metal substrate. The method includes: (a) depositing an alumina-doped platinum-silicon powder onto a metal substrate, (b) heating the coated substrate to diffuse the platinum-silicon powder into the substrate and removing the undiffused scale, (c) depositing an aluminum-bearing powder onto the platinum-silicon-enriched substrate, and (d) heating the coated substrate to diffuse the aluminum-bearing powder into the substrate and removing the undiffused scale. The depositions are preferably done electrophoretically, in which case the Pt--Si deposition bath is doped with alumina or some other inert particulate. Alternatively, slurry deposition may be used. The method may also be used to deposit Pd--Si coatings onto metal substrates.