By cutting a surface of a CMC component which has to receive a TBC a rough surface is yielded, which is rough enough to have a good adhesion of a following ceramic coating.

By cutting a surface of a CMC component which has to receive a TBC a rough surface is yielded, which is rough enough to have a good adhesion of a following ceramic coating.

A composition is generally provided that includes a silicon-containing material (e.g., silicon metal and/or a silicide) and a boron-doped refractory compound, such as about 0.001% to about 85% by volume of the boron-doped refractory compound (e.g., about 1% to about 60% by volume). In one embodiment, a bond coating on a surface of a ceramic component is generally provided with the bond coating including such a composition, with the silicon-containing material is silicon metal.

A composition is generally provided that includes a silicon-containing material (e.g., silicon metal and/or a silicide) and a boron-doped refractory compound, such as about 0.001% to about 85% by volume of the boron-doped refractory compound (e.g., about 1% to about 60% by volume). In one embodiment, a bond coating on a surface of a ceramic component is generally provided with the bond coating including such a composition, with the silicon-containing material is silicon metal.

Some examples include a turbine component comprising: a ceramic composite (CMC) having a matrix; and a watertight coating chemically miscible and/or mutually soluble with/in the CMC because particles and/or fibers which are composed of an identical or chemically matching, but at least chemically compatible. At least part of the watertight coating is incorporated in the matrix of the CMC, the matching and compatible material comprising at least one of: aluminum oxide, yttrium aluminum garnet (YAG), and yttrium-stabilized zirconium oxide (YSZ).

Some examples include a turbine component comprising: a ceramic composite (CMC) having a matrix; and a watertight coating chemically miscible and/or mutually soluble with/in the CMC because particles and/or fibers which are composed of an identical or chemically matching, but at least chemically compatible. At least part of the watertight coating is incorporated in the matrix of the CMC, the matching and compatible material comprising at least one of: aluminum oxide, yttrium aluminum garnet (YAG), and yttrium-stabilized zirconium oxide (YSZ).

A method that includes introducing a suspension comprising a coating material and a carrier into a heated plume of a thermal spray device. The coating material may include silicon or a silicon alloy. The method further includes directing the coating material using the heated plume toward a substrate that includes a ceramic or a ceramic matrix composite and depositing the coating material to form a bond coat directly on the substrate such that the bond coat defines a porosity of less than about 3 percent by volume.

A method that includes introducing a suspension comprising a coating material and a carrier into a heated plume of a thermal spray device. The coating material may include silicon or a silicon alloy. The method further includes directing the coating material using the heated plume toward a substrate that includes a ceramic or a ceramic matrix composite and depositing the coating material to form a bond coat directly on the substrate such that the bond coat defines a porosity of less than about 3 percent by volume.

A ceramic component is generally provided that includes a silicon-based layer comprising a silicon-containing material (e.g., a silicon metal and/or a silicide) and about 0.001% to about 85% of a Ga-containing compound. For example, the silicon-based layer can be a bond coating directly on the surface of the substrate. Alternatively or additionally, the silicon-based layer can be an outer layer defining a surface of the substrate, with an environmental barrier coating on the surface of the substrate. Gas turbine engines are also generally provided that include such a ceramic component.

A ceramic component is generally provided that includes a silicon-based layer comprising a silicon-containing material (e.g., a silicon metal and/or a silicide) and about 0.001% to about 85% of a Ga-containing compound. For example, the silicon-based layer can be a bond coating directly on the surface of the substrate. Alternatively or additionally, the silicon-based layer can be an outer layer defining a surface of the substrate, with an environmental barrier coating on the surface of the substrate. Gas turbine engines are also generally provided that include such a ceramic component.