Coating processes – Spray coating utilizing flame or plasma heat – Metal or metal alloy coating
Reexamination Certificate
2008-04-22
2008-04-22
Zimmerman, John J. (Department: 1794)
Coating processes
Spray coating utilizing flame or plasma heat
Metal or metal alloy coating
C428S328000, C428S632000, C428S697000, C428S699000, C428S701000, C428S702000, C416S24100B, C427S453000, C427S454000, C427S455000
Reexamination Certificate
active
10624254
ABSTRACT:
The oxidation behavior of the bond coat is improved using a HVOF nanostructured NiCrAlY coating. NiCrAlY powder is mechanically cryomilled and HVOF sprayed onto Ni-based alloy to form a nanocrystalline bond coat. Oxidation is performed on the coating to form the thermally grown oxide layer (thermally grown oxide). After heat treatment at 1000° C. for 24 and 95 hour, a homogeneous α-Al2O3layer is formed on top of the bond coat. The nanostructured characteristic of the coating and the presence of Al2O3within the cryomilled powders (oxidation occurred during cryomilling process) affects the nucleation of the alumina layer on the top of the coating. The formation of a continuous thermally grown oxide layer protects the coating from further oxidation and avoids the formation of mixed oxide protrusions, such as those presented in the coating sprayed using the as-received powder.
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Ajdelsztajn Leonardo
Kim George E.
Lavernia Enrique J.
Provenzano Virgil
Schoenung Julie M.
Austin Aaron
Myers Dawes Andras & Sherman LLP
Perpetual Technologies
The Regents of the University of California
Zimmerman John J.
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