An article for high temperature service is presented herein. One embodiment is an article including a substrate having a silicon-bearing ceramic matrix composite; and a layer disposed over the substrate, wherein the layer includes silicon and a dopant, the dopant including aluminum. In another embodiment, the article includes a ceramic matrix composite substrate, wherein the composite includes a silicon-bearing ceramic and a dopant, the dopant including aluminum; a bond coat disposed over the substrate, where the bond coat includes elemental silicon, a silicon alloy, a silicide, or combinations including any of the aforementioned; and a coating disposed over the bond coat, the coating including a silicate (such as an aluminosilicate or rare earth silicate), yttria-stabilized zirconia, or a combination including any of the aforementioned.

An article for high temperature service is presented herein. One embodiment is an article including a substrate having a silicon-bearing ceramic matrix composite; and a layer disposed over the substrate, wherein the layer includes silicon and a dopant, the dopant including aluminum. In another embodiment, the article includes a ceramic matrix composite substrate, wherein the composite includes a silicon-bearing ceramic and a dopant, the dopant including aluminum; a bond coat disposed over the substrate, where the bond coat includes elemental silicon, a silicon alloy, a silicide, or combinations including any of the aforementioned; and a coating disposed over the bond coat, the coating including a silicate (such as an aluminosilicate or rare earth silicate), yttria-stabilized zirconia, or a combination including any of the aforementioned.

An article may include a substrate defining at least one at least partially obstructed surface. The substrate includes at least one of a ceramic or a ceramic matrix composite. The article also may include an environmental barrier coating on the at least partially obstructed substrate. The environmental barrier coating includes a layer including a rare earth disilicate and a microstructure comprising closed porosity.

An article comprises a substrate, a coating disposed on a surface of the substrate. The coating comprises a carbon composite dispersed in one or more of the following: a polymer matrix; a metallic matrix; or a ceramic matrix. The carbon composite comprises carbon and a binder containing one or more of the following: SiO.sub.2; Si; B; B.sub.2O.sub.3; a filler metal; or an alloy of the filler metal.

An article comprises a substrate, a coating disposed on a surface of the substrate. The coating comprises a carbon composite dispersed in one or more of the following: a polymer matrix; a metallic matrix; or a ceramic matrix. The carbon composite comprises carbon and a binder containing one or more of the following: SiO.sub.2; Si; B; B.sub.2O.sub.3; a filler metal; or an alloy of the filler metal.

An article comprises a body and at least one final plasma resistant coating layer on at least one surface of the body. The at least one final plasma resistant coating layer is a mixture of a ScF.sub.3 and an initial plasma resistant coating material selected from the group consisting of YF.sub.3, Y.sub.2O.sub.3, a compound of Y.sub.4Al.sub.2O.sub.9, a solid-solution of Y.sub.2O.sub.3—ZrO.sub.2, CaF.sub.2, MgF.sub.2, SrF.sub.2, AlF.sub.3, ErF.sub.3, LaF.sub.3, NdF.sub.3, ScF.sub.3, CeF.sub.4, ZrF.sub.4, and combinations thereof. The at least one final plasma resistant coating layer has a thermal expansion coefficient that is within about 20% of the thermal expansion coefficient of the body.

An article comprises a body and at least one final plasma resistant coating layer on at least one surface of the body. The at least one final plasma resistant coating layer is a mixture of a ScF.sub.3 and an initial plasma resistant coating material selected from the group consisting of YF.sub.3, Y.sub.2O.sub.3, a compound of Y.sub.4Al.sub.2O.sub.9, a solid-solution of Y.sub.2O.sub.3—ZrO.sub.2, CaF.sub.2, MgF.sub.2, SrF.sub.2, AlF.sub.3, ErF.sub.3, LaF.sub.3, NdF.sub.3, ScF.sub.3, CeF.sub.4, ZrF.sub.4, and combinations thereof. The at least one final plasma resistant coating layer has a thermal expansion coefficient that is within about 20% of the thermal expansion coefficient of the body.

A method of manufacturing a fiber reinforced coating. The method includes providing a substrate and plasma spraying a ceramic matrix having fibers encapsulated in a precursor material onto the substrate.

A method of manufacturing a fiber reinforced coating. The method includes providing a substrate and plasma spraying a ceramic matrix having fibers encapsulated in a precursor material onto the substrate.

A hydrocarbon fluid containment article having a wall with a surface that is wetted by hydrocarbon fluid. The surface includes an anti-coking coating. The anti-coking coating includes a copper salt, a silver salt, or a combination thereof. A gas turbine engine component including a wall having a first surface and an anti-coking coating on the first surface of the wall that is wetted by hydrocarbon fluid. The anti-coking coating including a copper salt, a silver salt, or a combination thereof that prevents the formation of gum or coke on a surface thereon. Methods for reducing the deposition of thermal decomposition products on a wall of an article are also provided.