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AssigneesOhio Aerospace Institute, The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorsDongming Zhu, Robert A. Miller
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A thermal barrier coating composition is provided. The composition has a base oxide, a primary stabilizer, and at least two additional cationic oxide dopants. Preferably, a pair of group A and group B defect cluster-promoting oxides is used in conjunction with the base and primary stabilizer oxides. The new thermal barrier coating is found to have significantly lower thermal conductivity and better sintering resistance. In preferred embodiments, the base oxide is selected from zirconia and hafnia. The group A and group B cluster-promoting oxide dopants preferably are selected such that the group A dopant has a smaller cationic radius than the primary stabilizer oxide, and so that the primary stabilizer oxide has a small cationic radius than that of the group B dopant.
A thermal barrier coating composition comprising 46–97 molar percent base oxide, 2–25 molar percent primary stabilizer, 0.5–25 molar percent group A dopant. and 0.5–25 molar percent group B dopant, said base oxide being selected from the group consisting of ZrO2, HfO2 and combinations thereot said primary stabilizer being selected from the group consisting of Y2O3, Dy2O3, Er2O3 and combinations thereof, said group B dopant being selected from the group consisting of Nd2O3, Sm3O3, Gd2O3, Eu2O3 and combinations thereof, and said group A dopant being selected from the group consisting of rare earth oxides, alkaline earth metal oxides, transition metal oxides and combinations thereof, but excluding those species contained in said base oxide, group B dopant and primary stabilizer groups,
A thermal barrier coating composition comprising a ceramic alloy solid solution baying a base oxide lattice structure or structures, said solid solution comprising 46–97 molar percent base oxide, 2–25 molar percent primary stabilizer, 0.5–25 molar percent group A dop ant, and 0.5–25 molar percent group B dopant, said base oxide being selected from the group consisting of ZrO2, HfO2 and combinations thereof, said primary stabilizer being selected from the group consisting of Y2O3, Dy2O3, Er2O3 and combinations thereof, each of said group A dopant and said group B dopant being selected from the group consisting of rare earth oxides, alkaline earth metal oxides, transition metal oxides and combinations thereof, but excluding those species contained in said base oxide and primary stabilizer groups,
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