Rolls-royce Corporation

Rolls-royce High Temperature Composites Inc.

Sunny Chang

Li Li

Ann Bolcavage

Taylor K Blair

Stephanie Gong

Ngunjoh Lawrence Ndamka

Sungbo Shim

Matthew R Gold

David C Fairbourn

Johnny D Grubbs

An article may include a substrate including a ceramic matrix composite (CMC); a composite coating layer including a first coating material that includes a rare-earth disilicate and a second coating material that includes at least one of a rare-earth monosilicate, a CMAS-resistant material, or a high-temperature dislocating material, where the second coating material forms a substantially continuous phase in the composite coating layer.

Composite coating layer for ceramic matrix composite substrate

A method for removing a coating including a rare earth silicate from a substrate including a ceramic or ceramic matrix composite may include contacting a coating comprising a rare earth silicate with a liquid comprising an active species. The active species may include at least one of a mineral acid or a base. The method also may include working the coating to cause removal of at least a portion of the coating.

Removing coatings from ceramic matrix composite substrates

An article for use in a high-temperature environment that includes a substrate including a superalloy material, a ceramic, or a ceramic matrix composite, and an abradable coating on the substrate, the abradable coating including a rare earth silicate and a dislocator phase, the dislocator phase forms one or more distinct phase regions in the abradable coating and comprises at least one of hafnium diboride (HfB), zirconium diboride (ZrB), tantalum nitride (TaN or TaN), tantalum carbide (TaC), titanium diboride (TiB), zirconium carbide (ZrC), hafnium carbide (HfC), tantalum diboride (TaB), hafnium nitride (HfN), or niobium carbide (NbC).

Low porosity abradable coating

A method of forming an impurity barrier layer on a CMC substrate may include introducing, to a heated plume of a thermal spray gun, a composite feedstock that includes a first coating material including a plurality of first particles; and a second coating material that may be different from the first coating material, where the second coating material at least partially encapsulates at least a portion of respective surfaces of the plurality of first particles; and directing, using the heated plume, at least the first coating material to a surface of a CMC substrate to deposit an impurity barrier layer including at least the first coating material.

Impurity barrier layer for ceramic matrix composite substrate

An article includes a substrate, a bond coat on the substrate, and a multilayer environmental barrier coating (EBC) on the bond coat. The multilayer EBC includes a first EBC layer defining a first thickness and a second EBC layer defining a second thickness. The first EBC layer includes a first rare earth disilicate and a first concentration of a sintering aid that includes alumina. The second EBC layer includes a second rare earth disilicate and a second concentration of the sintering aid that includes alumina, less than the first concentration of the sintering aid.

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Carmel, IN, United States of America

Sunny Chang