Tubular products
AssigneeYorkshire Imperial Metals Limited
InventorsKenneth Thomas Jackson, Lance Porter
Life of this patent
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Abstract
A bimetallic tube comprising a copper-base alloy and a reactive metal such as titanium, is produced by assembling concentrically a tubular member of each of such materials and interposing a layer of copper, nickel or silver between them, forming a bond between the reactive metal and the copper, nickel or silver and extruding the assembly. The bimetallic tube is useful for heat exchange purposes when corrosive fluids are involved and has better heat transfer properties than an all-reactive metal tube.
Claims15
A method of producing a composite tubular product comprising assembling concentrically a first tubular member of a highly corrosion resistant reactive metal which is selected from the group consisting of titanium, tantalum and zirconium and a second tubular member of a highly thermally conductive metal which is selected from the group consisting of copper and copper alloy with a relatively narrow annular gap therebetween, there being a layer of coating of a metal selected from the group consisting of copper and nickel on the surface of the first member facing towards the second member, heating the assembly to an extrusion temperature at which diffusion occurs at the interface between the reactive metal and the layer or coating thereon, and then extruding the assembly at that temperature to bond the layer or coating to the highly thermally conductive metal, a diffusion bond being formed between the reactive metal and said coating.
A method of producing a composite tubular product comprising assembling concentrically a first tubular member of a highly corrosion resistant reactive metal which is selected from the group consisting of titanium, tantalum and zirconium and a second tubular member of a highly thermally conductive metal which is selected from the group consisting of copper and copper alloy with a relatively narrow annular gap therebetween, there being a layer of coating of copper on the surface of the first member facing towards the second member, heating the assembly to an extrusion temperature at which diffusion occurs at the interface between the reactive metal and the layer or coating thereon, and the extruding the assembly at that temperature to bond the layer or coating to the highly thermally conductive metal, a diffusion bond being formed between the reactive metal and the copper.
A method of producing a composite tubular product comprising assembling concentrically a first tubular member of a highly corrosion resistant reactive metal which is selected from the group consisting of titanium, tantalum and zirconium and a second tubular member of a highly thermally conductive metal which is selected from the group consisting of copper and a copper alloy with a relatively narrow annular gap therebetween, there being a layer or coating of nickel on the surface of the first member facing towards the second member, heating the assembly to an extrusion temperature at which diffusion occurs at the interface between the reactive metal and the layer or coating thereon, and then extruding the assembly at that temperature to bond the layer or coating to the highly thermally conductive metal, a diffusion bond being formed between the reactive metal and the nickel.
Dependencies are inferred from the claim text.