Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2007-01-23
2007-01-23
McNeil, Jennifer C. (Department: 1775)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S688000, C428S689000, C427S248100, C416S24100B
Reexamination Certificate
active
10921515
ABSTRACT:
Zirconia-containing ceramic compositions useful for thermal barrier coatings having improved mechanical properties, especially improved fracture toughness. These compositions comprise: (1) at least about 93 mole % zirconia; (2) a stabilizing amount up to about 5 mole % of a stabilizer metal oxide selected from the group consisting of yttria, calcia, ceria, scandia, magnesia, india, gadolinia, neodymia, samaria, dysprosia, erbia, ytterbia, europia, praseodymia, and mixtures thereof, and a fracture toughness improving amount up to about 2 mole % lanthana. These ceramic compositions can be used to prepare thermal barrier coatings to provide a thermally protected article having a substrate and optionally a bond coat layer adjacent to and overlaying the substrate. The thermal barrier coating can be prepared by depositing the ceramic composition on the bond coat layer or the substrate in the absence of a bond coat layer.
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Boutwell Brett Allen
Spitsberg Irene
Cummings Ted
Guttag Eric W.
Ivey Elizabeth D.
Jagtiani & Guttag
McNeil Jennifer C.
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