Thermal barrier coating systems and materials
AssigneeUnited Technologies Corporation
InventorMichael J. Maloney
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Abstract
A new family of ceramic materials is identified having particular utility as thermal insulating or thermal barrier coatings on metallic substrates. The ceramic materials have a pyrochlore structure and are typified by the composition A.sub.2 B.sub.2 O.sub.7 where A and B are various ions and O is oxygen. A may have a positive charge of 3.sup.+ or 2.sup.+ and B may have a positive charge of 4.sup.+ or 5.sup.30. These materials are characterized by having chemical stability, thermal stability and thermal insulating properties superior to those of currently used thermal barrier ceramics. An example pyrochlore material is lanthanum zirconate.
Claims22
A metallic article comprising a metallic substrate, said substrate having a thermally-insulating ceramic coating on its surface wherein said ceramic coating has a cubic pyrochlore structure.
A metallic article comprising a metallic substrate, said substrate having an alumina forming coating on its surface and a thermally insulating pyrochlore coating bonded to said alumina forming coating.
Dependencies are inferred from the claim text.