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AssigneePraxair S.T. Technology, Inc.
InventorsWilliam Jarosinski, John Quets, Daming Wang, Vladimir Belov, Ardy Simon Kleyman
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This invention relates to rolls for use in or in contact with molten metal comprising a roll drum having an outer peripheral surface and a thermally sprayed coating on the outer peripheral surface of said roll drum, said thermally sprayed coating comprising from about 66 to about 88 weight percent of tungsten, from about 2.5 to about 6 weight percent of carbon, from about 6 to about 20 weight percent of cobalt, and from about 2 to about 9 weight percent of chromium; a process for preparing the rolls; a method for forming a metal layer on a metal sheet utilizing the rolls, e.g., galvanization; and a thermal spray powder for coating the outer peripheral surface of the rolls.
A roll for use in or in contact with molten metal comprising a roll drum having an outer peripheral surface and a thermally sprayed coating on the outer peripheral surface of said roll drum, wherein said thermally sprayed coating is thermal sprayed from a thermal spray powder, said thermally sprayed coating comprising from about 66 to about 88 weight percent of tungsten, from about 2.5 to about 6 weight percent of carbon, from about 6 to about 20 weight percent of cobalt, and from about 2 to about 9 weight percent of chromium;
A roll for use in or in contact with molten metal comprising a roll drum having an outer peripheral surface and a thermally sprayed coating on the outer peripheral surface of said roll drum, wherein said thermally sprayed coating is thermal sprayed from a thermal spray powder, said thermal spray powder comprising from about 66 to about 88 weight percent of tungsten, from about 2.5 to about 6 weight percent of carbon, from about 6 to about 20 weight percent of cobalt, and from about 2 to about 9 weight percent of chromium;
A roll for use in or in contact with molten metal comprising a roll drum having an outer peripheral surface and a thermally sprayed coating on the outer peripheral surface of said roll drum, wherein said thermally sprayed coating is thermal sprayed from a thermal spray powder, said thermally sprayed coating comprising (i) one or more metal carbides represented by the formula MxC wherein M is one or more of W, Co and Cr, (ii) a metallic binder comprising CoCr, and (iii) a Cr2O3 layer in at least a portion of splat boundaries to protect said metal carbides and said metallic binder;
A roll for use in or in contact with hot zinc or a galvanizing bath containing about 0.05 to about 5 weight % of Al, said roll comprising a roll drum having an outer peripheral surface and a thermally sprayed coating on the outer peripheral surface of said roll drum, wherein said thermally sprayed coating is thermal sprayed from a thermal spray powder, said thermally sprayed coating comprising from about 66 to about 88 weight percent of tungsten, from about 2.5 to about 6 weight percent of carbon, from about 6 to about 20 weight percent of cobalt, and from about 2 to about 9 weight percent of chromium;
A roll for use in or in contact with hot zinc or a galvanizing bath containing about 0.05 to about 5 weight % of Al, said roll comprising a roll drum having an outer peripheral surface and a thermally sprayed coating on the outer peripheral surface of said roll drum, wherein said thermally sprayed coating is thermal sprayed from a thermal spray powder, said thermal spray powder comprising from about 66 to about 88 weight percent of tungsten, from about 2.5 to about 6 weight percent of carbon, from about 6 to about 20 weight percent of cobalt, and from about 2 to about 9 weight percent of chromium;
A roll for use in or in contact with hot zinc or a galvanizing bath containing about 0.05 to about 5 weight % of Al, said roll comprising a roll drum having an outer peripheral surface and a thermally sprayed coating on the outer peripheral surface of said roll drum, wherein said thermally sprayed coating is thermal sprayed from a thermal spray powder, said thermally sprayed coating comprising (i) one or more metal carbides represented by the formula MxC wherein M is one or more of W, Co and Cr, (ii) a metallic binder comprising CoCr, and (iii) a Cr2O3 layer in at least a portion of splat boundaries to protect said metal carbides and said metallic binder;
Dependencies are inferred from the claim text.