Abstract:
A rare earth silicate-based hermetic layer includes a thermal sprayed coating including a rare earth silicate having a hermetic microstructure. An environmental barrier coating includes a bond coat layer including silicon; and at least one rare earth silicate-based hermetic layer deposited on the bond coat layer by thermal spraying. The rare earth silicate-based hermetic layer includes a thermal sprayed coating including a rare earth silicate having a hermetic microstructure. An article for service in extreme environments may be provided with such an environmental barrier coating. A thermal spray feedstock for producing a rare earth silicate-based hermetic layer.
Abstract:
A method for the formation of channels on a metallic substrate is described. The method includes the steps of applying at least one layer of a metallic coating material onto a surface of the substrate by a cold spray technique, so as to define boundary walls for the channels, and to build the boundary walls to a desired height. Additional coating material is then applied on one or more surfaces of the boundary walls by the cold spray technique, so as to modify the shape of the channels. The substrate can be any type of high-temperature component or hot gas path component. In some instances, the substrate is a gas turbine engine wall.
Abstract:
A method for manufacturing an article configured to enhance the coalescence of a dispersed phase from a continuous phase in an emulsion is presented. The method includes forming a pattern of a plurality of regions on a surface of the article, wherein a portion of the plurality of regions is substantially wetting with respect to the dispersed phase, and a portion of the plurality of regions is substantially non-wetting with respect to the dispersed phase. The pattern further includes a plurality of inter-connected regions that are substantially non-wetting with respect to the dispersed phase.
Abstract:
A method of coating a surface is provided. The method comprises feeding a feedstock to a thermal spray torch, the feedstock comprising a liquid, disposing the feedstock on a substrate by thermal spray under conditions selected to produce a textured surface comprising a hierarchical structure, wherein the hierarchical structure comprises agglomerations of at least partially melted and solidified particles derived from the feedstock with individual at least partially melted and solidified particles derived from the feedstock disposed on a surface of the agglomerations; and applying a surface energy modification material over the textured surface. An article comprising a component having a coated surface is also provided.
Abstract:
Coating systems for components of a gas turbine engine, such as a compressor casing, are provided. The coating system can include a ceramic material disposed along the compressor casing on a surface to be adjacent to a rotating compressor blade. The coating system is harder than the compressor blade and can reduce the rub ratio between the casing and blade. The coating system can thereby increase the lifetime of the compressor casing and blades. Methods are also provided for applying the coating system onto a compressor casing.
Abstract:
An apparatus for enhancing the coalescence of a dispersed phase from a continuous phase in an emulsion is presented. The apparatus includes at least one inlet for receiving the emulsion, at least one outlet for discharging the emulsion after coalescing the dispersed phase, and at least one article disposed between the inlet and the outlet. The article includes a plurality of regions disposed on a surface in a predefined pattern, wherein a portion of the plurality of regions is substantially wetting with respect to the dispersed phase, and a portion of the plurality of regions is substantially non-wetting with respect to the dispersed phase, and wherein the pattern includes a plurality of inter-connected regions that are substantially non-wetting with respect to the dispersed phase. A related article is also presented.
Abstract:
An apparatus for enhancing the coalescence of a dispersed phase from a continuous phase in an emulsion is presented. The apparatus includes at least one inlet for receiving the emulsion, at least one outlet for discharging the emulsion after coalescing the dispersed phase, and at least one article disposed between the inlet and the outlet. The article includes a plurality of regions disposed on a surface in a predefined pattern, wherein a portion of the plurality of regions is substantially wetting with respect to the dispersed phase, and a portion of the plurality of regions is substantially non-wetting with respect to the dispersed phase, and wherein the pattern includes a plurality of inter-connected regions that are substantially non-wetting with respect to the dispersed phase. A related article is also presented.