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AssigneeGeneral Electric Company
InventorsWilliam R. Stowell, Joseph Thomas Begovich, Thomas Walter Rentz, Glen A. MacMillan, John Greene, Jane Ann Murphy, Dainel P. Ivkovich, Jr., Andrew J. Skoog
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A protective coating and coating method for protecting a thermal barrier coating (TBC) on a component, such as a component of a gas turbine engine. The protective coating comprises alumina particles in a silica-containing matrix, and may be substantially homogeneous or formed of multiple layers having different compositions. The composition and relative amounts of alumina and matrix material in the protective coating enable the coating to react with molten compounds containing calcia, magnesia, alumina and/or silica (CMAS), forming a compound with a melting temperature that is significantly higher than CMAS. As such, infiltration of molten CMAS into the TBC is significantly reduced or entirely avoided.
A component having a thermal barrier coating on a surface thereof, the component comprising an outer protective coating overlying the thermal barrier coating, the outer protective coating comprising alumina particles in a silica-containing matrix, the alumina particles constituting about 5 to about 85 weight percent of the outer protective coating, and the silica-containing matrix consisting essentially of at least one of silica, silicate, and mullite, and constituting about 1 to about 45 weight percent of the outer protective coating.
A gas turbine engine component having a thermal barrier coating of partially-stabilized zirconia on a surface thereof, the component comprising an outer protective coating overlying the thermal barrier coating, the outer protective coating comprising alumina particles in a binder matrix, the binder matrix consisting essentially of at least one of silica, silicate and mullite, the alumina particles constituting about 5 to about 85 weight percent of the outer protective coating, the binder matrix constituting about 1 to about 45 weight percent of the outer protective coating, the outer protective coating having a surface roughness of not greater than 3.8 micrometers Ra.
Dependencies are inferred from the claim text.