Abstract: A process of treating a coated article and a treated article are disclosed. The process includes providing an article having a MCrAlY coating, applying an aluminide treatment onto the MCrAlY coating to form a treated MCrAlY coating, and outwardly forming ?-phase material from the MCrAlY coating into the treatment. The applying is selected from the group consisting of soaking, spraying, brushing, dipping, pouring, pack cementation, vapor deposition, and combinations thereof. The treated article includes a substrate and a treated MCrAlY coating positioned on at least a portion of the substrate. The treated MCrAlY coating includes a ?-phase aluminide in a spray-applied, brush-applied, pour-applied, dip-applied, pack cement-applied, vapor deposit-applied, or soaking-applied treatment.

Abstract: In one embodiment, a method for forming an article with a diffusion portion comprises: forming a slurry comprising chromium and silicon, applying the slurry to the article, and heating the article to a sufficient temperature and for a sufficient period of time to diffuse chromium and silicon into the article and form a diffusion portion comprising silicon and a microstructure comprising ?-chromium. In one embodiment, a gas turbine component comprises: a superalloy and a diffusion portion having a depth of less than or equal to 60 ?m measured from the superalloy surface into the gas turbine component. The diffusion portion has a diffusion surface having a microstructure comprising greater than or equal to 40% by volume ?-chromium.

Abstract: Methods of reducing an initial cross-sectional area of a hole in a component to a predetermined cross-sectional area including preparing a composition comprising at least an aluminum alloy with a melting temperature higher than aluminum, applying the composition to an interior surface of the hole, and then heating the component to cause a metal within the component to diffuse from the component into the composition and react with the aluminum alloy in the composition to form a coating on the interior surface of the hole. The heating step is performed to selectively modify the initial cross-sectional area of the hole and thereby directly attain the predetermined cross-sectional area thereof.

Abstract: A method for making a cellular seal member for a turbine is disclosed. The method includes, in sequence, forming a diffusion aluminide coating on a surface of a cellular seal to form a coated cellular seal. The method also includes brazing the coated cellular seal to a seal substrate.

Abstract: A slurry and slurry coating process for forming a diffusion aluminide coating on a substrate, including internal surfaces within the substrate. The process involves preparing a slurry of a powder containing a metallic aluminum alloy having a melting temperature higher than aluminum, an activator capable of forming a reactive halide vapor with the metallic aluminum, and a binder containing an organic polymer. The slurry is applied to surfaces of the substrate, which is then heated to burn off the binder, vaporize and react the activator with the metallic aluminum to form the halide vapor, react the halide vapor at the substrate surfaces to deposit aluminum on the surfaces, and diffuse the deposited aluminum into the surfaces to form a diffusion aluminide coating. The process can be tailored to selectively produce an inward or outward-type coating. The binder burns off to form an ash residue that can be readily removed.

Abstract: A process of treating a coated article and a treated article are disclosed. The process includes providing an article having a MCrAlY coating, applying an aluminide treatment onto the MCrAlY coating to form a treated MCrAlY coating, and outwardly forming ?-phase material from the MCrAlY coating into the treatment. The applying is selected from the group consisting of soaking, spraying, brushing, dipping, pouring, pack cementation, vapor deposition, and combinations thereof. The treated article includes a substrate and a treated MCrAlY coating positioned on at least a portion of the substrate. The treated MCrAlY coating includes a ?-phase aluminide in a spray-applied, brush-applied, pour-applied, dip-applied, pack cement-applied, vapor deposit-applied, or soaking-applied treatment.

Abstract: Methods of reducing an initial cross-sectional area of a hole in a component to a predetermined cross-sectional area including preparing a composition comprising at least an aluminum alloy with a melting temperature higher than aluminum, applying the composition to an interior surface of the hole, and then heating the component to cause a metal within the component to diffuse from the component into the composition and react with the aluminum alloy in the composition to form a coating on the interior surface of the hole. The heating step is performed to selectively modify the initial cross-sectional area of the hole and thereby directly attain the predetermined cross-sectional area thereof.

Abstract: A casting process for producing metal alloy castings, facecoats and apparatuses suitable for carrying out the process, and castings produced by the process. The casting process entails the use of a mold having a cavity with a continuous aluminum-containing solid facecoat on its surface. A molten quantity of a metal alloy is introduced into the mold cavity so that the molten alloy contacts the solid facecoat. The mold is then allowed to cool to solidify the molten alloy and form a cast product. During the casting process, aluminum in the solid facecoat diffuses into the cast product to form an aluminum-containing surface region at the casting surface. Following removal of the cast product from the mold, an alumina-containing scale grows on the casting surface as a result of oxidation of the casting surface region.

Abstract: A method for making a cellular seal member for a turbine is disclosed. The method includes, in sequence, forming a diffusion aluminide coating on a surface of a cellular seal to form a coated cellular seal. The method also includes brazing the coated cellular seal to a seal substrate.

Abstract: Disclosed is a foam structure, a process of fabricating the foam structure, and a turbine including the foam structure. The foam structure includes a cast metallic foam having pores and a gel positioned within at least a portion of the pores. The process of fabricating the foam structure includes providing the cast metallic and infusing the cast metal foam with the gel. The turbine includes a rotating portion and a turbine seal including the foam structure.

Abstract: Disclosed is a turbine, a turbine seal structure, and a process of servicing a turbine. The turbine includes the seal structure. The seal structure is mechanically secured within the hot gas path of the turbine. The process of servicing includes positioning the seal structure within the hot gas path of the turbine and mechanically securing the seal structure within the turbine.

Abstract: Provided is a turbine seal, a turbine, and a process of fabricating a turbine seal. The turbine seal includes a metallic foam positioned along a hot gas path of a turbine. The turbine includes a blade configured to rotate along a predetermined path in response to a hot gas and a metallic foam turbine seal positioned to be contacted by the hot gas. The process of fabricating the turbine seal includes providing a blade configured to rotate along a predetermined path in response to a hot gas and positioning a metallic foam turbine seal to be contacted by the hot gas.

Abstract: A method and coating for maintaining surface-related properties of a gas turbine combustor component having a wall formed of a nickel-base alloy containing a gamma prime precipitate strengthening phase, interior and exterior surfaces defined by the wall, and at least one hole in the wall that fluidically connects the interior and exterior surfaces of the combustor component. A diffusion coating composition is applied at least within the hole, and then heated to form a diffusion aluminide coating in at least an in-wall surface region of the wall that surrounds and defines the hole. The aluminiding coating forms a diffusion zone that contains a sufficient amount of aluminum intermetallics to inhibit depletion of the gamma prime precipitates in the wall and inhibit degradation and cracking in the in-wall surface region surrounding the hole.

Abstract: A method and composition are provided for coating honeycomb seals and, more specifically, to a method and slurry for applying an aluminide coating onto honeycomb seals. The method includes preparing a slurry of a powder containing a metallic aluminum alloy having a melting temperature higher than aluminum, an activator capable of forming a reactive halide vapor with the metallic aluminum, and a binder containing an organic polymer. The slurry is applied to surfaces of the honeycomb seal, which is then heated to remove or burn off the binder, vaporize and react the activator with the metallic aluminum to form the halide vapor, react the halide vapor at the substrate surfaces to deposit aluminum on the surfaces of the seal, and diffuse the deposited aluminum into the surfaces to form a diffusion aluminide coating.

Abstract: A proximity detection circuit suitable for use with an on-board vehicle charger, such as but not limited to the type of charges used within hybrid and hybrid electric vehicles, to facilitate current conservation during period of time when it is unnecessary or otherwise undesirable for the on-board charger to test for connection of a cordset or other connection used to connect the on-board charger to a charging station or other current source.

Abstract: A casting process for producing metal alloy castings, facecoats and apparatuses suitable for carrying out the process, and castings produced by the process. The casting process entails the use of a mold having a cavity with a continuous aluminum-containing solid facecoat on its surface. A molten quantity of a metal alloy is introduced into the mold cavity so that the molten alloy contacts the solid facecoat. The mold is then allowed to cool to solidify the molten alloy and form a cast product. During the casting process, aluminum in the solid facecoat diffuses into the cast product to form an aluminum-containing surface region at the casting surface. Following removal of the cast product from the mold, an alumina-containing scale grows on the casting surface as a result of oxidation of the casting surface region.

Abstract: In one embodiment, a method for forming an article with a diffusion portion comprises: forming a slurry comprising chromium and silicon, applying the slurry to the article, and heating the article to a sufficient temperature and for a sufficient period of time to diffuse chromium and silicon into the article and form a diffusion portion comprising silicon and a microstructure comprising ?-chromium. In one embodiment, a gas turbine component comprises: a superalloy and a diffusion portion having a depth of less than or equal to 60 ?m measured from the superalloy surface into the gas turbine component. The diffusion portion has a diffusion surface having a microstructure comprising greater than or equal to 40% by volume ?-chromium.

Abstract: A process for creating a near-surface cooling passage in an air-cooled turbomachine component. The process entails forming a channel in a surface of a surface region of the component so that the channel is open at the surface and fluidically connected to a first cooling passages within the component. A metallic layer is then deposited on the surface and over the channel without filling the channel. The metallic layer closes the channel at the surface of the surface region to define therewith a second cooling passage within the component that is fluidically connected to the first cooling passages. A coating system is then deposited on the metallic layer to define an outermost surface of the component. The second cooling passage is closer to the outermost surface of the component than the first cooling passages.

Abstract: A proximity detection circuit suitable for use with an on-board vehicle charger, such as but not limited to the type of charges used within hybrid and hybrid electric vehicles, to facilitate current conservation during period of time when it is unnecessary or otherwise undesirable for the on-board charger to test for connection of a cordset or other connection used to connect the on-board charger to a charging station or other current source.

Abstract: In one embodiment, a method for forming an article with a diffusion portion comprises: forming a slurry comprising chromium and silicon, applying the slurry to the article, and heating the article to a sufficient temperature and for a sufficient period of time to diffuse chromium and silicon into the article and form a diffusion portion comprising silicon and a microstructure comprising ?-chromium. In one embodiment, a gas turbine component comprises: a superalloy and a diffusion portion having a depth of less than or equal to 60 ?m measured from the superalloy surface into the gas turbine component. The diffusion portion has a diffusion surface having a microstructure comprising greater than or equal to 40% by volume ?-chromium.