Stock material or miscellaneous articles – All metal or with adjacent metals – Having composition – density – or hardness gradient
Patent
1997-08-04
1999-06-15
Zimmerman, John J.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having composition, density, or hardness gradient
428623, 428627, 428632, 428633, 428667, 428678, 416241R, 416241B, B32B 1504, F01D 528
Patent
active
059120878
ABSTRACT:
A bond coat 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 has graded thermal expansion properties that moderate the transition between a metal substrate and a thermal-insulating ceramic layer of a TBC protecting the substrate, while also reducing the service temperature of the bond coat so as to reduce its rate of oxidation. Preferably, the bond coat has multiple layers, with the coefficients of thermal conductivity of the individual bond coat layers being very close to that of the substrate in order to promote heat transfer from the outward layer of the bond coat to the substrate. By minimizing the service temperature of the bond coat while grading the thermal expansion properties through the coating system, a more spall-resistant coating system is achieved.
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Gigliotti, Jr. Michael Francis Xavier
Jackson Melvin Robert
Ritter Ann Melinda
General Electric Company
Johnson Noreen C.
Stoner Douglas E.
Zimmerman John J.
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