Stock material or miscellaneous articles – All metal or with adjacent metals – Having composition – density – or hardness gradient
Patent
1998-03-06
1999-12-14
Speer, Timothy
Stock material or miscellaneous articles
All metal or with adjacent metals
Having composition, density, or hardness gradient
428615, 428623, 428632, 428633, 428667, 428678, 428680, 416241B, B32B 1504, F01D 528
Patent
active
06001492&
ABSTRACT:
A bond coat (20) of a thermal barrier coating system for components designed for use in a hostile thermal environment, such as turbine, combustor and augmentor components of a gas turbine engine. The composition of the bond coat (20) has graded thermal expansion properties that moderate the transition between a metal substrate (10) and a thermal-insulating ceramic layer (12) of a TBC protecting the substrate (10), while also reducing the service temperature of the bond coat (20) so as to reduce its rate of oxidation. Preferably, the bond coat (20) has multiple layers (20a, 20b, 20c), with the coefficients of thermal conductivity of the individual bond coat layers (20a, 20b, 20c) being very close to that of the substrate (10) in order to promote heat transfer from the outward layer (20c) of the bond coat (20) to the substrate (10). By minimizing the service temperature of the bond coat (20) while grading the thermal expansion properties through the coating system, a more spall-resistant coating system is achieved. The inward layer (20a) of the bond coat (20) preferably contains a metallic constituent, such as an aluminum and/or chromium-containing intermetallic, MCrAl and/or MCrAlY, a middle layer (20b) of the bond coat (20) also contains the metallic constituent in addition to a chromium phase, and an outward layer (20c) of the bond coat (20) contains the chromium phase and at least one platinum-containing phase. The middle and outermost layers (20b, 20c) may also contain chromium carbides such as Cr.sub.3 C.sub.2.
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Gigliotti, Jr. Michael Francis Xavier
Jackson Melvin Robert
Ritter Ann Melinda
General Electric Company
Johnson Noreen C.
Speer Timothy
Stoner Douglas E.
Young Bryant
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