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AssigneePraxair S. T. Technology, Inc.
InventorsTetyana P. Shmyreva, James Knapp, Ardy Simon Kleyman
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This invention relates to thermally sprayed coatings having an amorphous-nanocrystalline-microcrystalline composition structure, said thermally sprayed coating comprising from about 1 to about 95 volume percent of an amorphous phase, from about 1 to about 80 volume percent of a nanocrystalline phase, and from about 1 to about 90 volume percent of a microcrystalline phase, and wherein said amorphous phase, nanocrystalline phase and microcrystalline phase comprise about 100 volume percent of said thermally sprayed coating. This invention also relates to methods for producing the coatings, thermal spray processes for producing the coatings, and articles coated with the coatings. The thermally sprayed coatings of this invention provide enhanced wear and corrosion resistance for articles used in severe environments (e.g., landing gears, airframes, ball valves, gate valves (gates and seats), pot rolls, and work rolls for paper processing).
A thermally sprayed coating having an amorphous-nanocrystalline-microcrystalline composition structure, said thermally sprayed coating comprising from about 1 to about 95 volume percent of an amorphous phase, from about 1 to about 80 volume percent of a nanocrystalline phase, and from about 1 to about 90 volume percent of a microcrystalline phase, and wherein said amorphous phase, nanocrystalline phase and microcrystalline phase comprise about 100 volume percent of said thermally sprayed coating, in which (i) the nanocrystalline phase comprises discrete particles, wherein said particles comprise one or more grains having a nanocrystalline structure, and wherein said nanocrystalline structure comprises a grain size of less than about 100 nanometers;
A thermally sprayed coating having an amorphous-nanocrystalline-microcrystalline composition structure, said thermally sprayed coating comprising from about 5 to about 90 volume percent of said amorphous phase, from about 5 to about 75 volume percent of said nanocrystalline phase, and from about 5 to about 80 volume percent of said microcrystalline phase, wherein said amorphous phase, nanocrystalline phase and microcrystalline phase comprise about 100 volume percent of said thermally sprayed coating.
A thermally sprayed coating having an amorphous-nanocrystalline-microcrystalline composition structure, said thermally sprayed coating comprising from about 1 to about 95 volume percent of an amorphous phase, from about 1 to about 80 volume percent of a nanocrystalline phase, and from about 1 to about 90 volume percent of a microcrystalline phase, and wherein said amorphous phase, nanocrystalline phase and microcrystalline phase comprise about 100 volume percent of said thermally sprayed coating, wherein the coating comprises a cermet, metal alloy or alloy-oxide ceramic coating, in which the cermet coating comprises WCM where M is Cr, Co, Ni, CrC, NiCr or any combination thereof, the metal alloy coating comprises FeM′M″ where M′ is Cr, Ni, Co or any combination thereof, and M″ is C, Si, B, P or any combination thereof, and the alloy-oxide ceramic coating comprises M′″CrAlY+X where M′″ is Ni, Co or Fe or any combination thereof, and X is fine oxide ceramic dispersant particles, in which the fine oxide ceramic dispersant particles comprise fine alumina dispersant particles, and said alloy-oxide ceramic coating optionally includes the addition of Pt, Ta, Hf, Re, singularly or in combination.
Dependencies are inferred from the claim text.