Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2005-03-22
2005-03-22
McNeil, Jennifer (Department: 1775)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S702000, C428S699000, C428S697000, C428S304400, C428S632000, C428S336000, C427S255310, C427S596000, C427S453000, C416S24100B
Reexamination Certificate
active
06869703
ABSTRACT:
A reduced thermal conductivity thermal barrier coating having improved impact and erosion resistance for an underlying metal substrate of articles that operate at, or are exposed to, high temperatures. This coating comprises a zirconia-containing ceramic composition having a c/a ratio in the range of from about 1.0117 to about 1.0148 and stabilized in the tetragonal phase by a stabilizing amount of a stabilizer metal oxide. The coating has a fraction of porosity of from about 0.10 to about 0.25, and an impact and erosion resistance property defined by at least one of the following formulas: (a) I=exp.[5.85−(144×s)−(3.68×p)]; and/or; (b) E=[187−(261×p)−(9989×s)], wherein s=1.0117−c/a ratio; p is the fraction of porosity; I is least about 140 g/mil; and E is least about 130 g/mil. This coating can be used to provide a thermally protected article having a metal substrate and optionally a bond coat layer adjacent to and overlaying the metal substrate. The thermal barrier coating can be prepared by depositing the zirconia-containing ceramic composition on the bond coat layer, or the metal substrate in the absence of the bond coat layer.
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Boutwell Brett Allen
Spitsberg Irene
General Electric Company
Guttag Eric W.
Jagtiani & Guttag
McNeil Jennifer
Narciso David L.
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