Reactive thermal barrier coating
AssigneeRtx Corporation
InventorsBrian T. Hazel, Elisa M. Zaleski, Kaylan M. Wessels
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Abstract
A calcium-magnesium-alumino-silicate (CMAS)-reactive thermal barrier coating includes a ceramic coating and a CMAS-reactive overlay coating, wherein the CMAS-reactive overlay coating conforms to a surface of the ceramic coating and comprises a compound that forms a stable high melting point crystalline precipitate when reacted with molten CMAS at a rate that is competitive with CMAS infiltration kinetics into the thermal barrier coating. The ceramic coating phase is stable with the CMAS-reactive overlay coating.
Claims13
A calcium-magnesium-alumino-silicate (CMAS)-reactive thermal barrier coating comprising:
- a ceramic coating comprising a plurality of featherlike columnar grains separated by vertically-oriented gaps open to an outer surface, the ceramic coating comprising stabilized zirconia or stabilized hafnia;
- and
- a CMAS-reactive overlay coating, wherein the CMAS-reactive overlay coating conforms to a surface of the ceramic coating and comprises a pure rare earth oxide, a mixed rare earth oxide, or a rare earth aluminate.
Dependencies are inferred from the claim text.