Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2007-08-14
2007-08-14
McNeil, Jennifer (Department: 1775)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S632000, C428S702000, C428S336000, C416S24100B
Reexamination Certificate
active
10898776
ABSTRACT:
A reduced thermal conductivity thermal barrier coating having improved impact resistance for an underlying substrate of articles that operate at, or are exposed to, high temperatures. This coating comprises an inner high fracture toughness layer nearest to the underlying substrate and having a thickness up to about 5 mils (127 microns) sufficient to impart impact resistance to the thermal barrier coating, and comprises a zirconia-containing ceramic composition having a c/a ratio of the zirconia lattice in the range of from about 1.011 to about 1.016 and stabilized in the tetragonal phase by a stabilizing amount of a stabilizing metal oxide selected from the group consisting of yttria, calcia, ceria, scandia, magnesia, india, lanthana, gadolinia, neodymia, samaria, dysprosia, erbia, ytterbia, europia, praseodymia, and mixtures thereof. The thermal barrier coating further includes an outer thermal insulating layer adjacent to and overlaying the inner layer and comprising a ceramic thermal barrier coating material. The thermal barrier can be used to provide a thermally protected article having a substrate (e.g., metal substrate) and optionally a bond coat layer adjacent to and overlaying the substrate. The thermal barrier coating can be prepared by forming the inner high fracture toughness layer, followed by forming on the inner layer the outer thermal insulating layer.
REFERENCES:
patent: 4861618 (1989-08-01), Vine et al.
patent: 5350599 (1994-09-01), Rigney et al.
patent: 5384200 (1995-01-01), Giles et al.
patent: 5687679 (1997-11-01), Mullin et al.
patent: 5705231 (1998-01-01), Nissley et al.
patent: 5780171 (1998-07-01), Nissley et al.
patent: 5942334 (1999-08-01), Wortman
patent: 5981088 (1999-11-01), Bruce et al.
patent: 6025078 (2000-02-01), Rickerby et al.
patent: 6054184 (2000-04-01), Bruce et al.
patent: 6117560 (2000-09-01), Maloney
patent: 6123997 (2000-09-01), Schaeffer et al.
patent: 6183884 (2001-02-01), Rickerby
patent: 6284323 (2001-09-01), Maloney
patent: 6319614 (2001-11-01), Beele
patent: 6333118 (2001-12-01), Alperine et al.
patent: 6352788 (2002-03-01), Bruce
patent: 6387526 (2002-05-01), Beele
patent: 6465090 (2002-10-01), Stowell et al.
patent: 6764779 (2004-07-01), Liu et al.
patent: 6869703 (2005-03-01), Spitsberg et al.
patent: 2002/0172838 (2002-11-01), Rigney et al.
patent: 2003/0044624 (2003-03-01), Spitsberg et al.
patent: 2003/0224200 (2003-12-01), Bruce
Hwang et al., “Grain Size Control of Tetragonal Zirconia Polycrystals Using the Space Charge Concept”, J. Am. Ceram. Soc., 1990, 73(11):3269-77.
Kim, “Effect of Ta2O5, Nb2O5, and HfO2Alloying on the Transformability of Y2O3-Stabilized Tetragonal ZrO2”, J. Am. Ceram. Soc., 73(1):115-120.
Nakayama et al., “Effect of La2O3Addition on Thermal Stability of Y-TZP,” J. Mat. Sci. Lett., 18:1339-41 (1999).
Vassen et al., “Zirconates as New Materials for Thermal Barrier Coatings,” J. Am. Ceram. Soc., 83(8):2023-28 (2000).
Chen et al, “Mechanisms Governing the High Temperature Erosion of Thermal Barrier Coatings,” Wear, 256:735-46 (2004).
U.S. Appl. No. 10/748,516, filed Dec. 30, 2003, Gorman et al.
U.S. Appl. No. 10/748,517, filed Dec. 30, 2003, Boutwell et al.
U.S. Appl. No. 10/748,519, filed Dec. 30, 2003, Darolia et al.
U.S. Appl. No. 10/748,508, filed Dec. 30, 2003, Spitsberg et al.
U.S. Appl. No. 10/748,520, filed Dec. 30, 2003, Spitsberg et al.
U.S. Appl. No. 10/748,521, filed Dec. 30, 2003, Spitsberg et al.
U.S. Appl. No. 10/748,518, filed Dec. 30, 2003, Spitsberg et al.
U.S. Appl. No. 10/748,513, filed Dec. 30, 2003, Spitsberg et al.
U.S. Appl. No. 10/830,685, filed Apr. 21, 2004, Gorman et al.
Boutwell Brett Allen
Bruce Robert William
Spitsberg Irene
Andes William Scott
General Electric Company
Louke Marcella R.
McNeil Jennifer
LandOfFree
Thermal barrier coatings with high fracture toughness... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thermal barrier coatings with high fracture toughness..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal barrier coatings with high fracture toughness... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3828204