Composite metallic roll with release surface and method of making same
AssigneePlasma Coatings Limited
InventorThomas E. Nalband
Life of this patent
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Abstract
A composite metallic roll or other member comprising a body member of a base metal, a porous plasma flame spray plate of a nickel chromium alloy, and a continuous film of a Teflon deposited over said plate and impregnating the same for gradual exposure over a predetermined life. The corresponding method comprises the steps of applying the plasma flame spray plate with a porous finish and a subsequent application of a thin uniform deposit of a Teflon (tetraflouroethylene). The Teflon is thereupon heated to and is above its fusion temperature whereby to provide an impregnate film for gradual exposure over a predetermined life.
Claims12
A composite metallic roll or the like comprising a body member, a porous plate to a depth of 0.002 to 0.003 of an inch and comprising stainless steel, nickel, nickel chromium, molybdenum, a carbide, or a ceramic flame sprayed over the body member, and a continuous film of a fluorocarbon polymer impregnated into said porous plate for a gradual exposure over a predetermined life, said fluorocarbon polymer comprising tetrafluoroethylene, hexafluoropropylene, monochlorotrifluoroethylene, or tetrafluoroethylene-hexafluoropropylene.
A method of making a composite metallic roll or the like comprising the steps of providing a body member, applying a porous plating to a depth of 0.002 to 0.003 inches to said body in a flame spraying process, said plating comprising stainless steel, nickel, nickel chromium, molybdenum, a carbide, or a ceramic, and applying a thin uniform deposit of a fluorocarbon polymer comprising tetrafluoroethylene, hexafluoropropylene, monochlorotrifluoroethylene, or tetrafluoroethylene-hexafluoropropylene, and heating said deposit to a level above the fusion temperature of the fluorocarbon polymer whereby to provide an impregnant film for gradual exposure over a predetermined life.
Dependencies are inferred from the claim text.