Abstract: An article includes a substrate and a coating provided on a surface of the substrate. The coating includes at least one metal silicide layer consisting essentially of MoSi2 or WSi2 or (Mo, W)Si2 or a platinum group metal silicide and at least one layer consisting essentially of Si3N4.

Abstract: A coating system on a superalloy or silicon-containing substrate of an article exposed to high temperatures. The coating system includes a coating layer that overlies the substrate and is susceptible to hot corrosion promoted by molten salt impurities. A corrosion barrier coating overlies the coating layer and contains at least one rare-earth oxide-containing compound that reacts with the molten salt impurities to form a dense, protective byproduct barrier layer.

Abstract: A turbomachine component includes a body having an exterior surface and an interior surface, an internal cavity defined by the interior surface, and a reactivity neutralizing member arranged within the internal cavity. The reactivity neutralizing member is configured and disposed to neutralize turbomachine combustion products on the interior surface of the body.

Abstract: An environmental barrier coating system for a component of a gas turbine includes at least one rare earth disilicate layer and at least one rare earth monosilicate layer. At least one of the at least one rare earth disilicate layer or the at least one rare earth monosilicate layer includes an alkaline earth oxide dopant.

Abstract: An article includes a silicon-containing region; at least one outer layer overlying a surface of the silicon-containing region; and a constituent layer on the surface of the silicon-containing region and between and contacting the silicon-containing region and the at least one outer layer, the constituent layer being formed by constituents of the silicon-containing region and being susceptible to creep within an operating environment of the article, wherein the silicon-containing region defines a plurality of channels and a plurality of ridges that interlock within the plurality of channels are formed in the silicon-containing region to physically interlock the at least one outer layer with the silicon-containing region through the constituent layer.

Abstract: Article includes a substrate, a bond coat disposed on the substrate, an environmental barrier coating disposed on the bond coat, and a patterned abradable coating disposed on the second top coat. The environmental barrier coating includes an intermediate layer disposed on the bond coat, a sealing layer disposed on the intermediate layer, a first top coat disposed on the sealing layer, and a second top coat disposed on the first top coat. The first top coat is different from the second top coat.

Abstract: An article includes a silicon-containing region including surface features on a surface thereof. The surface features include depressions, protuberances, or combinations thereof. At least one outer layer overlies the surface of the silicon-containing region. A constituent layer is provided on the surface of the silicon-containing region and between and contacting the silicon-containing region and the at least one outer layer. The constituent layer is formed by constituents of the silicon-containing region and is susceptible to creep within an operating environment of the article. The surface features physically interlock the at least one outer layer with the silicon-containing region through the constituent layer.

Abstract: A system and method for measuring cooling effectiveness of a component is disclosed. The method includes providing a component having a surface provided with a coating including a volatilization-susceptible constituent and a volatilization-resistant constituent. Further, the method includes supplying a first gaseous medium over the surface of the component through a plurality of holes in the component and feeding a second gaseous medium along the surface of the component. The method includes exposing the surface of the component to the first and second gaseous mediums for a predetermined period. The method further includes determining a thickness of the coating exposed to the flow of the first and second gaseous mediums. The method includes analyzing the thickness of the coating to determine whether the coating is removed from the surface of the component upon exposure to the first and second gaseous mediums.

Abstract: An article for use in aggressive environments is presented. In one embodiment, the article comprises a substrate and a self-sealing and substantially hermetic sealing layer comprising an alkaline-earth aluminosilicate disposed over the bondcoat. The substrate may be any high-temperature material, including, for instance, silicon-bearing ceramics and ceramic matrix composites. A method for making such articles is also presented. The method comprises providing a substrate; disposing a self-sealing alkaline-earth aluminosilicate layer over the substrate; and heating the sealing layer to a sealing temperature at which at least a portion of the sealing layer will flow.

Abstract: A system and method for measuring cooling effectiveness of a component is disclosed. The method includes providing a component having a surface provided with a coating including a volatilization-susceptible constituent and a volatilization-resistant constituent. Further, the method includes supplying a first gaseous medium over the surface of the component through a plurality of holes in the component and feeding a second gaseous medium along the surface of the component. The method includes exposing the surface of the component to the first and second gaseous mediums for a predetermined period. The method further includes determining a thickness of the coating exposed to the flow of the first and second gaseous mediums. The method includes analyzing the thickness of the coating to determine whether the coating is removed from the surface of the component upon exposure to the first and second gaseous mediums.

Abstract: A system and method for measuring cooling effectiveness of a component is disclosed. The method includes providing a component with a coating applied on a surface of the component. Further, the method includes supplying a first gaseous medium over a surface of the component through a plurality of holes in the component and feeding a second gaseous medium along the surface of the component. Further, the method includes exposing the surface of the component to the first and second gaseous mediums for a predetermined period. The method further includes obtaining an image of the surface of the component exposed to the first and second gaseous mediums for the predetermined period. The method includes analyzing the obtained image to determine whether at least a portion of the coating is removed from the surface of the component upon exposure to the second gaseous medium.

Abstract: An article includes a silicon-containing region; at least one outer layer overlying a surface of the silicon-containing region; and a constituent layer on the surface of the silicon-containing region and between and contacting the silicon-containing region and the at least one outer layer, the constituent layer being formed by constituents of the silicon-containing region and being susceptible to creep within an operating environment of the article, wherein the silicon-containing region defines a plurality of channels and a plurality of ridges that interlock within the plurality of channels are formed in the silicon-containing region to physically interlock the at least one outer layer with the silicon-containing region through the constituent layer.

Abstract: A system and method for measuring cooling effectiveness of a component is disclosed. The method includes providing a component with a coating applied on a surface of the component. Further, the method includes supplying a first gaseous medium over a surface of the component through a plurality of holes in the component and feeding a second gaseous medium along the surface of the component. Further, the method includes exposing the surface of the component to the first and second gaseous mediums for a predetermined period. The method further includes obtaining an image of the surface of the component exposed to the first and second gaseous mediums for the predetermined period. The method includes analyzing the obtained image to determine whether at least a portion of the coating is removed from the surface of the component upon exposure to the second gaseous medium.

Abstract: An article includes a substrate and a coating provided on a surface of the substrate. The coating includes at least one metal silicide layer consisting essentially of MoSi2 or WSi2 or (Mo, W)Si2 or a platinum group metal silicide and at least one layer consisting essentially of Si3N4.

Abstract: An article includes a silicon-containing region including surface features on a surface thereof. The surface features include depressions, protuberances, or combinations thereof. At least one outer layer overlies the surface of the silicon-containing region. A constituent layer is provided on the surface of the silicon-containing region and between and contacting the silicon-containing region and the at least one outer layer. The constituent layer is formed by constituents of the silicon-containing region and is susceptible to creep within an operating environment of the article. The surface features physically interlock the at least one outer layer with the silicon-containing region through the constituent layer.

Abstract: A turbomachine component includes a body having an exterior surface and an interior surface, an internal cavity defined by the interior surface, and a reactivity neutralizing member arranged within the internal cavity. The reactivity neutralizing member is configured and disposed to neutralize turbomachine combustion products on the interior surface of the body.

Abstract: In one aspect of the present invention, a method is provided. The method includes disposing a substantially amorphous cadmium tin oxide layer on a support; and thermally processing the substantially amorphous cadmium tin oxide layer in an atmosphere substantially free of cadmium from an external source to form a transparent layer, wherein the transparent layer has an electrical resistivity less than about 2×10?4 Ohm-cm. Method of making a photovoltaic device is also provided.

Abstract: A system comprises a plurality of components disposed to define a gas path. At least one component comprises a silicon-bearing substrate over which is disposed a coating, and the coating comprises a recession-resistant material exposed to the gas path. A silicon source is disposed in fluid communication with the gas path and is configured to be delivered to the gas path to maintain, in gas flowing in the gas path over the coating, a silicon mass concentration in the range from about 1.

Abstract: Embodiments disclosed herein provide hydrocarbon additives and methods of making and using the same. The additives are suitable for use in conjunction with gasifiers, furnaces, or other high-temperature vessels. The additives may be part of an input stream to a reaction vessel of a hydrocarbon gasifier. The additives may include materials that at least partially reduce the infiltration of slag into the refractory material.

Abstract: A coating system on a superalloy or silicon-containing substrate of an article exposed to high temperatures. The coating system includes a coating layer that overlies the substrate and is susceptible to hot corrosion promoted by molten salt impurities. A corrosion barrier coating overlies the coating layer and contains at least one rare-earth oxide-containing compound that reacts with the molten salt impurities to form a dense, protective byproduct barrier layer.