Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2004-01-13
2008-08-05
Zimmerman, John J. (Department: 1794)
Stock material or miscellaneous articles
Composite
Of inorganic material
C429S006000, C429S006000, C429S006000, C429S006000, C428S469000, C428S702000, C427S115000, C427S126300, C427S126600, C427S419200, C427S419300
Reexamination Certificate
active
07407717
ABSTRACT:
A method is disclosed for producing a protective coating on a chromium oxide-forming substrate, which comprises the steps of:(a) applying on the chromium-oxide-forming substrate having at least one alloying addition selected from the group consisting of manganese, magnesium, and vanadium, a coating consisting essentially of at least one spinel-forming element selected from the group consisting of cobalt, nickel, copper and vanadium,(b) forming a chromium oxide layer at the substrate/applied coating interface, and(c) at a temperature of 500° C. to 1000° C. causing the diffusion of the at least one alloying addition through the chromium oxide layer and forming a compound thereof with the at least one spinel-forming element diffusing from the applied coating and forming between the chromium oxide layer on the substrate and the applied coating, a uniform, compact, adherent chromium-free gas-tight spinel layer.
REFERENCES:
patent: 5942349 (1999-08-01), Badwal et al.
patent: 6824883 (2004-11-01), Benum et al.
patent: 6936217 (2005-08-01), Quadadakkers et al.
patent: 100 50 010 (2002-04-01), None
patent: WO 96/28855 (1996-09-01), None
patent: WO 97/04494 (1997-02-01), None
English translation of DE10050010 A1 to Frank Tietz, Apr. 18, 2002.
Quadakkers Willem J.
Shemet Vladimir
Tietz Frank
Zahid Mohsine
Austin Aaron
Forschungzentrum Julich GmbH
Myers Jonathan
Wilford Andrew
Zimmerman John J.
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