Abrading – Abrading process – Glass or stone abrading
Reexamination Certificate
1999-10-28
2001-07-03
Hail, III, Joseph J. (Department: 3723)
Abrading
Abrading process
Glass or stone abrading
C451S054000, C451S060000, C451S066000, C451S177000, C219S121470, C219S121480, C219S121510, C219S076160
Reexamination Certificate
active
06254458
ABSTRACT:
This invention pertains to environmental protection of metallic components by plasma deposition or physical vapor deposition of Nitinol alloys and particularly to the post processing of such coatings to give them enhanced properties.
BACKGROUND OF THE INVENTION
A need exists for improvements in the technology of providing protection against chemical and galvanic corrosion, erosion, and abrasion for metallic materials that are subjected to severe environments. These environments include exposure to wind, water, chlorides, acids, abrasion and erosion, to name a few.
Presently, the state of the art of environmental protection of metallic components is to apply paint, galvanizing, anodizing or epoxy to metal components, such as bolts, to protect them from the harmful influences noted above. However, these protective strategies are effective only temporarily at best, and often must be cut off when replacing at the end of a short life because the corrosion has made the corroded component an integral corroded mass with the mating component, making normal removal impossible. The problem is especially severe aboard ocean-going ships and in chemical and industrial plants where corrosive agents are in the environment.
SUMMARY OF THE INVENTION
Accordingly, it is an object of this invention to provide an improved protective coating on metal components that is resistant to chemical and galvanic corrosion, and is physically robust to resist chipping, erosion and abrasion so that the coating remains intact under must conditions of normal use. This procedure also allows for the production of metallic components that are superior in corrosion resistance and have an attractive hard and slippery coating.
This invention is a post processing procedure performed on the metal articles plasma-coated or coated by physical vapor deposition with a nickel-titanium alloy called Nitinol to provide superior environmental protection and desirable physical properties long sought in the industry in demanding applications. It includes coating by plasma spraying or physical vapor deposition Nitinol on a part or component to be protected from environmental damage, and heat treating the coating at about 400° C.-900° C. to give it the properties of ductility and toughness that will enable it to resist physical damage which otherwise could expose the substrate to the corrosive influences that the coating is supposed to protect it from.
REFERENCES:
patent: 3174851 (1965-03-01), Buehler et al.
patent: 5160802 (1992-11-01), Moscrip
patent: 5298835 (1994-03-01), Muehlberger et al.
patent: 5744777 (1998-04-01), Bernecki et al.
patent: 6043451 (2000-03-01), Julien et al.
Hail III Joseph J.
McDonald Shantese
Neary J. Michael
Nitinol Technologies, Inc.
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