Coating processes – With post-treatment of coating or coating material – Gas jet or blast mechanically treats coating
Reexamination Certificate
2009-05-14
2011-12-27
Meeks, Timothy (Department: 1715)
Coating processes
With post-treatment of coating or coating material
Gas jet or blast mechanically treats coating
C428S650000
Reexamination Certificate
active
08084094
ABSTRACT:
A coating process for an article having a substrate formed of a metal alloy that is prone to the formation of a secondary reaction zone (SRZ). The coating process forms a coating system that includes an aluminum-containing overlay coating and a stabilizing layer between the overlay coating and the substrate. The overlay coating contains aluminum in an amount greater by atomic percent than the metal alloy of the substrate, such that there is a tendency for aluminum to diffuse from the overlay coating into the substrate. The stabilizing layer is predominantly or entirely formed of at least one platinum group metal (PGM), namely, platinum, rhodium, iridium, and/or palladium. The stabilizing layer is sufficient to inhibit diffusion of aluminum from the overlay coating into the substrate so that the substrate remains essentially free of an SRZ that would be deleterious to the mechanical properties of the alloy.
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Boutwell Brett Allen Rohrer
Darolia Ramgopal
Gorman Mark Daniel
Hazel Brian Thomas
Andes William Scott
General Electric Company
Hartman Domenica N. S.
Hartman Gary M.
Meeks Timothy
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