Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Reexamination Certificate
2007-10-30
2007-10-30
McNeil, Jennifer (Department: 1775)
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
C428S469000, C428S472000, C428S633000, C428S632000, C428S678000, C428S679000, C428S670000, C416S24100B
Reexamination Certificate
active
10904222
ABSTRACT:
An article for use in hostile thermal environments, such as a component of a gas turbine engine. The article includes a nickel-base superalloy substrate that is prone to formation of a deleterious secondary reaction zone (SRZ), and an overlay coating having a predominantly gamma prime-phase nickel aluminide (Ni3Al) composition suitable for use as an environmental coating, including a bond coat for a thermal barrier coating. The coating comprises a chromium-containing nickel aluminide intermetallic overlay coating of predominantly the gamma prime phase, in which aluminum is present in the coating in an amount approximately equal to the aluminum content of the superalloy substrate so as to inhibit diffusion of aluminum from the overlay coating into the superalloy substrate.
REFERENCES:
patent: 4758480 (1988-07-01), Hecht et al.
patent: 6585878 (2003-07-01), Strangman et al.
patent: 6641929 (2003-11-01), Kelly et al.
Darolia Ramgopal
Walston William Scott
Baldwin Gordon R.
General Electric Company
Hartman Domenica N. S.
Hartman Gary M.
McNeil Jennifer
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