US 6,188,920 B1 · High performance (Bi,Pb)2Sr2Ca2Cu3Oy composites

Abstract

The present invention provides a (Bi,Pb)SCCO-2223 oxide superconductor composite which exhibits improved critical current density and critical current density retention in the presence of magnetic fields. Retention of critical current density in 0.1 T fields (77 K, ⊥ ab plane) of greater than 35% is disclosed. Significant improvements in oxide superconductor wire current carrying capacity in a magnetic field are obtained by subjecting the oxide superconductor composite to a post-processing heat treatment which reduces the amount of lead in the (Bi,Pb)SCCO-2223 phase and forms a lead-rich non-superconducting phase. The heat treatment is carried out under conditions which localize the lead-rich phase at high energy sites in the composite.

Claims32

Dependent claims

A Bi,Pb)SCCO-2223 oxide superconductor multifilamentary composite wire, comprising:

a plurality of (Bi,Pb)SCCO-2223 oxide superconductor filaments substantially supported in a noble metal phase, wherein the filaments include a lead-rich secondary phase containing at least 5% of the total lead (Pb) content of the oxide filaments,
the wire characterized in that when tested over a current carrying distance of 10 cm, the wire possesses a Jret at 0.1 T in the range of about 15% to about 50% (77 K, ⊥ ab plane).

Dependencies are inferred from the claim text.

Facts

Application

09/137,733Filed 21 Aug 1998 · division

Priority

21 May 1996

Granted

13 Feb 2001

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

H10N 60/0801
Of devices comprising copper oxide: manufacture or treatment of filaments or composite wires
H10N 60/0268
Manufacture or treatment: of devices comprising copper oxide
Y10S 505/742
Process of making or treating high tc, above 30 k, superconducting shaped material, article, or device: annealing
H10N
Electric solid-state devices not otherwise provided for

High performance (Bi,Pb)2Sr2Ca2Cu3Oy composites

Life of this patent

High performance (Bi,Pb)2Sr2Ca2Cu3Oy composites

Life of this patent

Abstract

Claims32