Extrusion of metal oxide superconducting wire, tube or ribbon

Details Extrusion of metal oxide superconducting wire, tube or ribbon Extrusion of metal oxide superconducting wire, tube or ribbon

1990-08-23

1993-10-05

Nelson, Peter A.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

505704, 505740, 505780, 427 62, 264 66, 2641771, 26421111, C04B 3564

Patent

active

H00012394

ABSTRACT:
A process for extruding a superconducting metal oxide composition YBa.sub.2 Cu.sub.3 O.sub.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.

REFERENCES:
patent: 1978163 (1934-10-01), Megow
patent: 3290186 (1966-12-01), Rosi et al.
patent: 4612296 (1986-09-01), Sakamoto et al.
patent: 4640816 (1987-02-01), Atzmon et al.
patent: 4761129 (1988-08-01), Aste et al.

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