Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Reexamination Certificate
2006-11-30
2009-06-09
Zimmerman, John J. (Department: 1794)
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
C428S650000, C428S668000, C428S670000, C428S680000, C428S332000, C428S336000, C416S24100B
Reexamination Certificate
active
07544424
ABSTRACT:
A coating process and system 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 system 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
Austin Aaron
General Electric Company
Hartman Domenica N. S.
Hartman Gary M.
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