Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2005-07-12
2005-07-12
McNeil, Jennifer (Department: 1775)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S702000, C428S632000, C428S697000, C428S699000, C428S336000, C428S304400, C416S24100B, C427S453000, C427S596000, C427S255310
Reexamination Certificate
active
06916561
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 1.0057 to about 1.0123 and stabilized in the tetragonal phase by a stabilizing amount of a stabilizing metal oxide. The coating has a fraction of porosity of from about 0.15 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 70 g/mil; and E is least about 80 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.
REFERENCES:
patent: 4861618 (1989-08-01), Vine et al.
patent: 4886768 (1989-12-01), Tien
patent: 5104832 (1992-04-01), Michel et al.
patent: 5350599 (1994-09-01), Rigney et al.
patent: 5384200 (1995-01-01), Giles et al.
patent: 5705231 (1998-01-01), 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: 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.
Bruce, “Development of 1232° C (2250° ) Erosion and Impact Tests for Thermal Barrier Coatings”, Tribology Trans., (1998), 41(4):399-410.
Kim, “Effect of Ta2O5, Nb2O5, and HfO2Alloying on the Transformability of Y2O3-Stabilized Tetragonal ZrO2”, J. Am. Ceram. Soc., 73(1):115-120.
Vassen et al., “Zirconates as New Materials for Thermal Barrier Coatings,” J. Am. Ceram. Soc., 83(8):2023-28 (2000).
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. 10/748,513, filed Dec. 30, 2003, Spitsberg et al.
Boutwell Brett Allen
Spitsberg Irene
Guttag Eric W.
Jagtiani & Guttag
McNeil Jennifer
Narciso David L.
LandOfFree
Thermal barrier coatings with lower porosity for improved... 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 lower porosity for improved..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal barrier coatings with lower porosity for improved... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3367414