Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Reexamination Certificate
1999-05-04
2001-05-15
Speer, Timothy M. (Department: 1775)
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
C428S629000, C428S633000, C428S678000, C428S679000, C428S680000, C428S472000, C427S453000, C427S419200, C427S419300, C416S24100B
Reexamination Certificate
active
06231998
ABSTRACT:
FIELD OF THE INVENTION
This invention relates generally to the field of thermal barrier coatings, and more particularly to the field of thermal barrier coatings for use in very high temperature applications such as in the hot gas path of a combustion turbine engine.
BACKGROUND OF THE INVENTION
It is well known to utilize a ceramic coating to improve the corrosion resistance and mechanical durability of a gas/combustion turbine component. The demand for continued improvement in the efficiency of such turbines and combined cycle power plants has driven the designers of these systems to specify increasingly higher firing temperatures in the combustion portions of these systems. Although nickel and cobalt based superalloy materials are now used for components such as combustor transition pieces and turbine rotating and stationary blades in the hot gas flow path, even superalloy materials are not capable of surviving long term operation without some form of insulation from the operating environment.
It is known to coat a superalloy metal component with an insulating ceramic material to improve its ability to survive high operating temperatures in a combustion turbine environment; see for example U.S. Pat. No. 5,180,285 issued on Jan. 19, 1993 to Lau, and U.S. Pat. No. 4,576,874 issued on Mar. 18, 1986 to Spengler, et al, both incorporated by reference herein. One thermal barrier coating system in common use today is a yttria stabilized zirconia (YSZ) top coat applied to a super alloy substrate structure, often with an intermediate bond coat such as MCrAlY, where M may be nickel, cobalt, iron or a mixture thereof. However, even YSZ coated super alloy components are not capable of withstanding long term operation at the operating temperatures of the most modern and efficient engines where combustion temperatures may exceed 1,400 degrees C.
Accordingly, it is an object of this invention to provide an improved thermal barrier coating for the hot gas flow path components of a modern combustion turbine system. It is a further object of this invention to provide a component for a combustion turbine capable of long term operation in the high temperature, highly corrosive environment of the most modern of combustion turbine engines.
SUMMARY
In order to achieve these and other objects of the invention, a component capable of operating in a high temperature environment is provided, the component comprising: a superalloy substrate; a bond coat layer disposed on said superalloy substrate; a ceramic insulating layer disposed on said bond coat layer, said ceramic insulating layer comprising a hexagonal Zr
3
Sc
4
O
12
structure.
REFERENCES:
patent: 4576874 (1986-03-01), Spengler et al.
patent: 4639399 (1987-01-01), Aprigliano
patent: 4880614 (1989-11-01), Strangman et al.
patent: 4913961 (1990-04-01), Jones et al.
patent: 4916022 (1990-04-01), Solfest et al.
patent: 5059095 (1991-10-01), Kushner et al.
patent: 5180285 (1993-01-01), Lau
patent: 5773141 (1998-06-01), Hasz et al.
patent: 5912087 (1999-06-01), Jackson et al.
patent: 5939147 (1999-08-01), Jones
patent: 0 718 420 A1 (1996-06-01), None
patent: 0 718 419 A2 (1996-06-01), None
patent: 07073891 (1995-03-01), None
Thornber et al., Mixed Oxides of the type MO2 (fluorite)-M2O3. University Western Australia, Acta Crystallogr., Sect. B, 1968.*
Batalin et al., Formation of compounds of complex composition in the films of binary oxide systems. Kiev. Gos. Univ. Izv. Akad. Nauk SSSR, Neorg. Material, 1990.*
Wright Laboratory, Oxygen Barrier Oxides, WL-TR-91-4059 Final Report for Period6/89-10/90, 1990, Mar. 1992.
R.L. Jones, Scandia-Stabilized Zirconia for Resistance to Molten Vandate-Sulfate Corrosion, Surface and Coatings Technology, 39/40 (1989) 89-96, Elsevier Sequoia (No Month).
H.J. Rossell, Crystal Structures of Some Fluorite-Related M O Compounds, Journal of Solid State Chemistry 19, 103-111 (1976) (No Month).
Robert L. Jones; Experiences in Seeking Stabilizers for Zirconia Having Hot Corrosion-Resistance and High Temperature Tetragonal (t3 ) Stability; Naval Research Laboratory; Apr. 16, 1996; 21 pgs.
Bowker Jeffrey Charles
Goedjen John G.
Sabol Stephen M.
Siemens Westinghouse Power Corporation
Speer Timothy M.
Young Bryant
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