Multilayer thermal barrier coatings
AssigneeROLLS-ROYCE plc
InventorKang N. Lee
Life of this patent
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Abstract
A multilayer thermal barrier coating (TBC) may include a plurality of layers selected to provide properties to the multilayer TBC. For example, a multilayer TBC may include a first layer deposited over a substrate, a second layer deposited over the first layer and a third layer deposited over the second layer. The first layer may be selected to provide thermal cycling resistance, the second layer may be selected to provide low thermal conductivity and the third layer may be selected to provide at least one of erosion resistance and CMAS degradation resistance. The multilayer TBC may also include two layers, or more than three layers.
Claims30
A thermal barrier coating comprising:
- a first layer deposited over a substrate, wherein the first layer provides high thermal-cycling resistance;
- a second layer deposited over the first layer, wherein the second layer provides low thermal conductivity;
- and
- a third layer deposited over the second layer, wherein the third layer provides at least one of erosion resistance and CMAS degradation resistance.
An article comprising:
- a substrate;
- and
- a thermal barrier coating deposited over the substrate, wherein the thermal barrier coating comprises:
- a first layer deposited over the substrate, wherein the first layer possesses high thermal-cycling resistance;
- a second layer deposited over the first layer, wherein the second layer possesses low thermal conductivity;
- and
- a third layer deposited over the second layer, wherein the third layer possesses at least one of erosion resistance and CMAS degradation resistance.
An multilayer thermal barrier coating comprising:
- a first layer comprising at least one of:
- 7-8 yttria-stabilized zirconia, and
- a base oxide comprising at least one of zirconia and hafnia, a primary dopant comprising ytterbia, a first co-dopant comprising samaria, and a second co-dopant comprising at least one of lutetia, Scandia, ceria, gadolinia, neodymia and europia, wherein the first layer comprises a first phase constitution selected from a metastable tetragonal phase constitution and a cubic phase constitution;
- and
- a second layer deposited over the first layer, comprising:
- a base oxide comprising at least one of zirconia and hafnia;
- a primary dopant comprising ytterbia;
- a first co-dopant comprising samaria;
- and
- a second co-dopant comprising at least one of lutetia, Scandia, ceria, gadolinia, neodymia and europia, wherein the second layer comprises a second phase constitution selected from the metastable tetragonal phase constitution and the cubic phase constitution, and wherein the second phase constitution is different than the first phase constitution.
A multilayer thermal barrier coating comprising:
- a first layer deposited over a substrate, wherein the first layer provides high thermal-cycling resistance;
- a multilayer intermediate layer, wherein the multilayer intermediate layer provides at least one of low thermal conductivity and/or erosion resistance;
- and
- a top layer, wherein the top layer provides at least one of low thermal conductivity, erosion resistance, thermal cycling resistance, and CMAS degradation resistance
Dependencies are inferred from the claim text.