Equal channel angular pressing of multi size copper wire
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.
Claims10
A process to fabricate a plurality of ultra-fine grain 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 strands having a minimum bend radius/(t) according to ASTM E 290-14 of <0.4;
- curing a polyurethane reaction mixture around the plurality of annealed strands to form a sheathed strand assembly;
- equal channel angular pressing (ECAP pressing) the sheathed strand assembly through an ECAP die having a die channel having an angle of turning of 90 degrees, to form a plurality of ECAPed strands;
- hydrostatically extruding the plurality of ECAPed strands to form a plurality of reduced diameter strands;
- and
- quenching the plurality of reduced diameter strands in water to form the plurality of ultra-fine grain metal wires, wherein the plurality of ultra-fine grain metal wires have a grain size of 120 nm or less.
Dependencies are inferred from the claim text.