Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2005-02-22
2005-02-22
McNeil, Jennifer (Department: 1775)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S702000, C428S699000, C428S632000, C428S633000, C428S336000, C416S24100B, C427S453000, C427S596000, C427S255310
Reexamination Certificate
active
06858334
ABSTRACT:
Zirconia-containing ceramic compositions having a c/a ratio of the zirconia lattice in the range of from about 1.005 to about 1.016. These compositions comprise a stabilizing amount up to about 10 mole % of the composition of a stabilizer component which comprises: (1) a first metal oxide selected from the group consisting of yttria, calcia, ceria, scandia, magnesia, india and mixtures thereof in an amount of from about 1.5 to about 6 mole % of the composition of; (2) a second metal oxide selected from the group consisting of lanthana, neodymia and mixtures thereof in an amount of from about 0.5 to about 4 mole % of the composition; and (3) optionally ytterbia in an amount of from about 0.5 to about 4 mole % of the composition. These compositions further comprise hafnia in an amount of from about 0.5 to about 15 mole % of the composition; and optionally tantala in an amount of from about 0.5 to about 1.5 mole % of the composition. These compositions are useful in preparing thermal barrier coatings having a balance of reduced thermal conductivity with good producibility, spallation resistance and erosion/impact resistance for an underlying substrate of articles that operate at, or are exposed to, high temperatures.
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Boutwell Brett Allen
Bruce Robert William
Darolia Ramgopal
Gorman Mark Daniel
Mogro-Campera Antonio
General Electric Company
Guttag Eric W.
Jagtiani & Guttag
McNeil Jennifer
Narciso David L.
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