Article having a durable ceramic coating
AssigneeUnited Technologies Corporation
InventorMichael J. Maloney
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Abstract
An article having an improved thermal barrier coating is disclosed. The article includes a superalloy substrate, and an adherent alumina layer generated on the substrate surface. The article also includes a layer of ceramic material forming a columnar grain, thermal barrier coating on the alumina layer. The coating is composed of a generally homogeneous mixture of two materials, such as yttria and ceria and preferably at least about 5 w/o yttria, balance, ceria. The article may also include an intermediate ceramic bond coat, such as a layer of yttria strengthened zirconia, to enhance the adherence of the thermal barrier coating.
Claims27
A superalloy article comprising:
- a superalloy substrate;
- an adherent alumina layer on the substrate surface;
- and
- a layer of material forming a thermal barrier coating over the alumina layer, the as-deposited coating being composed of a solid solution of yttria and ceria with at least about 5 w/o yttria.
A superalloy article composing:
- a superalloy substrate;
- an adherent alumina layer on the substrate surface;
- and
- a ceramic, columnar grain, thermal barrier coating on the alumina layer, the as-deposited coating being composed of a generally homogeneous mixture of at least about 5 w/o yttria, balance ceria.
A superalloy article comprising:
- a superalloy substrate;
- an adherent alumina layer on the substrate surface;
- and
- a ceramic bond coat on the alumina layer, the ceramic bond coat composed of a stabilized zirconia.
The article of claim 21, wherein the ceramic bond coat is composed of yttria and zirconia.
Dependencies are inferred from the claim text.