Stock material or miscellaneous articles – Composite – Of metal
Reexamination Certificate
2001-04-27
2004-01-20
Jones, Deborah (Department: 1775)
Stock material or miscellaneous articles
Composite
Of metal
C501S137000
Reexamination Certificate
active
06680126
ABSTRACT:
BACKGROUND OF THE INVENTION
High temperature conditions impose unique material requirements. For instance, turbine engine components used in aerospace and equipment used in various energy-related fields require thermal barriers to reduce induction of heat to the metal component/equipment. Application of ceramic-based thermal barrier coatings (TBCs) to a metal/alloy substrate can facilitate use and operation at higher temperatures. However, degradation of TBCs at elevated temperatures, under thermal cycling conditions and in erosive or corrosive environments has raised concerns about the durability and reliability of such materials during use and over extended time. Spallation of ceramic-based TBCs during thermo-mechanical loading and thermal cycling has been, and remains, a key problem facing the art, particularly in the turbine industry.
Currently, the coating material most often used is yttria-stabilized zirconia (YSZ). YSZ has demonstrated adequate resistance to thermal conduction, but suffers from many drawbacks including poor phase and micro-structure stability and creep resistance, as well as high oxygen diffusivity at even moderately high temperatures. Induced stress caused by creep and bond-coat oxidation results in spallation of the YSZ coating. Accordingly, the search for alternate ceramic compositions that satisfy all the thermal, chemical, and thermo-mechanical requirements continues to be an on-going concern in the art.
REFERENCES:
patent: 5209860 (1993-05-01), Trivett
patent: 5442585 (1995-08-01), Eguchi et al.
patent: 5470668 (1995-11-01), Wu et al.
patent: 5713895 (1998-02-01), Lontine et al.
patent: 6231991 (2001-05-01), Maloney
patent: 6261643 (2001-07-01), Hasz et al.
patent: 6284323 (2001-09-01), Maloney
patent: 6319614 (2001-11-01), Beele
patent: 6382920 (2002-05-01), Dopper
patent: 6387526 (2002-05-01), Beele
patent: 6387539 (2002-05-01), Subramanian
patent: 6482476 (2002-11-01), Liu
patent: 2001/0007719 (2001-07-01), Maloney
patent: 2002/0061416 (2002-05-01), Subramanian
patent: 2002/0172837 (2002-11-01), Allen et al.
patent: 06-279098 (1994-04-01), None
Ravichandran, K., An, K., Dutton, R., and Semiatin, S.L. Thermal Conductivity of Plasma-Sprayed Monolithic and Multilayer Coatings of Alumina and Yttria-Stabilized Zirconia, Journal of the American Ceramic Society, vol. 82, No. 3, Mar. 1999, pp. 673-682.
Klemens, P.G. and Gell, M. Thermal Conductivity of Thermal Barrier Coatings, Materials Science & Engineering, A245 (1998) pp. 143-149, Elsevier Science S.A 1998. No month.
Fair, G., Shemkunas, M., Petuskey, W. and Sambasivan, S. Layered Perovskites as ‘Soft-Ceramics’, Journal of the European Ceramic Society, 1999, pp. 2437-2447, ElsevierScience Ltd., Great Britain, 1999.
Steiner, K.A., Thermal Expansion and Compressibility of Layered Perovskite Compounds, Thesis for Arizona State University, Aug. 1998.
Sambasivan Sankar
Steiner Kimberly
Applied Thin Films, Inc.
Jones Deborah
Reinhart Boerner Van Deuren s.c.
Sperty Arden
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