Thermal barrier coating systems and materials
AssigneeUnited Technologies Corporation
InventorMichael J. Maloney
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Abstract
A ceramic material has particular utility as a thermal insulating or thermal barrier coating on metallic substrates. The ceramic material includes gadolinia and zirconia, preferably forming gadolinia-zirconia oxide. The material may include fluorite and pyrochlore structure. This material exhibits chemical stability, thermal stability and thermal insulating properties superior to those of currently used thermal barrier ceramics, and also provides resistance to sintering and erosion comparable to currently used ceramics. A preferred material has between about 5-60 mol. % gadolinia.
Claims22
A metallic article comprising a metallic substrate having a ceramic thermal barrier coating on its surface wherein the ceramic thermal barrier coating is composed of gadolinia and zirconia and has a cubic crystal structure.
A metallic article comprising a metallic substrate, the substrate having an alumina forming coating on its surface and a ceramic thermal barrier coating bonded to the alumina forming coating, wherein the ceramic thermal barrier coating is composed of gadolinia and zirconia has a cubic crystal structure.
A metallic article comprising a metallic substrate having a ceramic coating on its surface wherein the ceramic coating consists of gadolinia and zirconia and has a cubic crystal structure.
Dependencies are inferred from the claim text.