Process for forming metal wires
AssigneePrince Mohammad Bin Fahd University
InventorFaramarz Djavanroodi
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Abstract
A process to fabricate ultra-fine grain metal wire, comprising: inserting a plurality of metal strands into a flexible elastic polyurethane sheath having an accommodating slot for each of the strands of metal to form a sheathed strand assembly; equal channel angular pressing (ECAP pressing) the sheathed strand assembly through an ECAP die having a plurality of die channels corresponding to the plurality of metal strands. The process is designed to improve electric conductance and mechanical properties of elongated metal parts and is especially applicable to optimize the conductance and tensile strength of copper cables, wires, strings, and rods.
Claims8
A process of forming metal wires, comprising:
- annealing a plurality of metal strands having a thickness (t) at a temperature of 500° C. or greater to form a plurality of annealed metal strands having a minimum bend radius/(t) according to ASTM E 290-14 of <0.4, wherein the metal strands are nickel or copper;
- curing a polyurethane reaction mixture around the plurality of annealed metal strands to form a sheathed metal strand assembly;
- equal channel angular pressing (ECAP pressing) the sheathed metal strand assembly through an ECAP die having a die channel having an angle of turning of 90 degrees, to form a plurality of ECAPed metal strands;
- hydrostatically extruding the plurality of ECAPed metal strands to form a plurality of reduced diameter metal strands;
- and
- quenching the plurality of reduced diameter metal strands in water to form the metal wires, wherein the metal wires have a grain size of 120 nm or less.
Dependencies are inferred from the claim text.