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USH1239H Expired / Lapsed US ⏱️ 0.0 years remaining

Extrusion of metal oxide superconducting wire, tube or ribbon

Assignee: United States Department of Energy
•
Filing: 1990-08-23
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Granted: 1993-10-05
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Expires: 2010-08-23
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Abstract

Abstract A process for extruding a superconducting metal oxide composition YBa 2 Cu 3 O 7-x provides a wire (tube or ribbon) having a cohesive mass and a degree of flexibility together with enhanced electrical properties. Wire diameters in the range of 6-85 mils have been produced with smaller wires on the order of 10 mils in diameter exhibiting enhanced flexibility for forming braided, or multistrand, configurations for greater current carrying capacity. The composition for extrusion contains a polymeric binder to provide a cohesive mass to bind the particles together during the extrusion process with the binder subsequently removed at lower temperatures during sintering. The composition for extrusion further includes a deflocculent, an organic plasticizer and a solvent which also are subsequently removed during sintering. Electrically conductive tubing with an inner diameter of 52 mil and an outer diameter of 87-355 mil has also been produced. Flat ribbons have been produced in the range of 10-125 mil thick by 100-500 mil wide. The superconducting wire, tube or ribbon may include an outer ceramic insulating sheath co-extruded with the wire, tubing or ribbon.

Inventors

  • 👤 Joseph T. Dusek

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 17:12
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0801; C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C04B35/4508; C04B35/622; C04B35/62227; C04B35/62231; C04B35/62254

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 221 words
A method for producing an elongated wire, tube or ribbon of a superconducting ceramic comprising the steps of: producing a cohesive material composed of particles of YBa 2 Cu 3 O 7-x , said particles having a generally uniform size with particles in the range of submicron to on the order of 40 microns, 1-8 wt. % of a deflocculent, 3-10 wt. % of an anhydrous plasticizer, 10-30 wt. % of a solvent, and 2-15 wt. % of a binder, said plasticizer and binder being soluble in the solvent; extruding said cohesive material through a wire-, tube- or ribbon-forming die to produce an elongated wire, tube or ribbon having a green stage density in the range of 45-58% theoretical density; extruding an outer sheath of a ceramic insulating material about the elongated wire, tube or ribbon as the wire, tube or ribbon is extruded; heating the wire, tube or ribbon in the green stage to volatilize the solvent and remove the plasticizer and binder at temperatures below approximately 240°-350° C.; sintering the YBa 2 Cu 3 O 7-x at temperatures in the order of 900°-960° C., wherein said sintering is carried out in the presence of oxygen; and annealing the sintered YBa 2 Cu 3 O 7-x in the presence of oxygen at a temperature in the range of 400°-500° C.
Claim 2
Independent Claim 221 words
A method for producing an elongated wire, tube or ribbon of a superconducting ceramic comprising the steps of: producing a cohesive material composed of particles of YBa 2 Cu 3 O 7-x , said particles having a generally uniform size with particles in the range of submicron to on the order of 40 microns, 1-8 wt. % of a deflocculent, 3-10 wt. % of an anhydrous plasticizer, 10-30 wt. % of a solvent, and 2-15 wt. % of a binder, said plasticizer and binder being soluble in the solvent; extruding said cohesive material through a wire-, tube- or ribbon-forming die to produce an elongated wire, tube or ribbon having a green stage density in the range of 45-58% theoretical density; extruding an outer sheath of a ceramic insulating material about the elongated wire, tube or ribbon as the wire, tube or ribbon is extruded; heating the wire, tube or ribbon in the green stage to volatilize the solvent and remove the plasticizer and binder at temperatures below approximately 240°-350° C.; sintering the YBa 2 Cu 3 O 7-x at temperatures in the order of 900°-960° C., wherein said sintering is carried out in the presence of oxygen; and annealing the sintered YBa 2 Cu 3 O 7-x in the presence of oxygen at a temperature in the range of 400°-500° C.
Claim 3
Dependent Claim 23 words
The method of claim 1 further comprising the step of forming a plurality of elongated wires or ribbons into a braided, multistrand conductor.
Claim 4
Dependent Claim 23 words
The method of claim 1 further comprising the step of providing the cohesive material with a viscosity in the range of 1,700-80,000 Poise.
Claim 5
Dependent Claim 25 words
The method of claim 1 wherein the step of extruding said cohesive material includes applying an extrusion pressure in the range of 800-25,000 pound load.

References Cited (Backward Citations)

US1978163A Cited
US3290186A Cited
US4612296A Cited
US4640816A Cited
US4761129A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1996-10-04 1997-04-05 1997-10-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2000-10-04 2001-04-05 2001-10-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2004-10-04 2005-04-05 2005-10-05 $7700.00 Window Closed / Lapsed

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