Multi-material thermal barrier coating system
AssigneeUnited Technologies Corporation
InventorsDavid A. Litton, Brian S. Tryon
Life of this patent
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Abstract
The thermal barrier coating system comprises a matrix of a first chemistry with multiple embedded second phases of a second chemistry. The matrix comprises a stabilized zirconia. The second regions comprise at least 40 mole percent of oxides having the formula Ln2O3, where Ln is selected from the lanthanides La through Lu, Y, Sc, In, Ca, and Mg with the balance zirconia (ZrO2), hafnia (HfO2), titania (TiO2), or mixtures thereof. The second phases have a characteristic thickness (T6) of less than 2.0 micrometers (μm). The spacing between second phases has a characteristic thickness (T5) of less than 8.0 micrometers (μm).
Claims21
An article comprising:
- a substrate;
- and
- a thermal barrier coating system atop the substrate and having a matrix having a first chemistry and a plurality of embedded second phases formed within the matrix having a second chemistry, different from the first chemistry,
- wherein:
- the matrix comprises a stabilized zirconia;
- the second phases comprise at least 40 mole percent of oxides having the formula Ln2O3, where Ln is selected from the lanthanides La through Lu, Y, Sc, In, Ca, and Mg with the balance zirconia (ZrO2), hafnia (HfO2), titania (TiO2), or mixtures thereof;
- the second phases have a characteristic thickness (T6) of less than 2.0 micrometers (μm);
- a spacing between second phases has a characteristic thickness (T5) of less than 8.0 micrometers (μm);
- and
- the embedded second phases within the matrix have a characteristic extent of 30%-85% of a perimeter of the substrate.
An article comprising:
- a substrate;
- and
- a thermal barrier coating system atop the substrate and having a matrix having a first chemistry and a plurality of embedded second phases formed within the matrix having a second chemistry, different from the first chemistry,
- wherein:
- the matrix comprises a stabilized zirconia;
- the second phases comprise at least 40 mole percent of oxides having the formula Ln2O3, where Ln is selected from the lanthanides La through Lu, Y, Sc, In, Ca, and Mg with the balance zirconia (ZrO2), hafnia (HfO2), titania (TiO2), or mixtures thereof;
- the second phases have a characteristic thickness (T6) of less than 2.0 micrometers (μm);
- a spacing between second phases has a characteristic thickness (T5) of less than 8.0micrometers (μm);
- and
- the embedded second phases are formed as patches and each of the second phase patches represents 30% to 85% of the coated surface area of the substrate.
Dependencies are inferred from the claim text.