Thermal barrier coatings with low thermal conductivity
AssigneeUnited Technologies Corporation
InventorsDavid A. Litton, Nicholas E. Ulion, Mladen F. Trubelja, Michael J. Maloney, Sunil Govinda Warrier
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Abstract
A ceramic material having particular utility as a thermal insulating or thermal barrier coating on metallic substrates is provided. The ceramic material broadly comprises at least one oxide and the balance comprising a first oxide selected from the group consisting of zirconia, ceria, and hafnia. The at least one oxide has a formula A2O3 where A is selected from the group consisting of La, Pr, Nd, Sm, Eu, Th, In, Sc, Y, Dy, Ho, Er, Tm, Yb, Lu, and mixtures thereof. The present invention also broadly relates to an article having a metal substrate and a thermal barrier coating as discussed above.
Claims29
A thermal barrier coating comprising greater than 30 mol % Sc2O3, a lanthanide sesquioxide having a formula A2O3 where A is selected from the group consisting of Nd, Eu, Dy, Gd, Er, Pr, and mixtures thereof, and the balance zirconia.
A thermal barrier coating comprising more than 20 mol % In2O3, a lanthanide sesquioxide having a formula A2O3 where A is selected from the group consisting of Er, Nd, Eu, Dy, Gd, Pr, and mixtures thereof, and the balance zirconia.
A thermal barrier coating comprising from 5 to 60 mol % of at least one of La2O3 and Sm2O3, and from 5% to 60 mol % of at least one oxide having a formula A2O3 where A is selected from the group consisting of Sc, In, Y, Pr, Nd, Eu, Gd, Dy, Er, Yb, and mixtures thereof, and the balance zirconia.
Dependencies are inferred from the claim text.