Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Shaping or consolidating
Patent
1991-08-16
1994-06-28
Lewis, Michael
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Shaping or consolidating
505782, 505501, 252521, H01B 1200, H01B 106
Patent
active
053247124
ABSTRACT:
A process for producing a high critical temperature bismuth strontium calcium copper oxide superconducting material. An intimate mixture is formed of two superconducting materials. The first material is bismuth strontium calcium copper oxide or (bismuth, lead) strontium calcium copper oxide, and has a bulk critical temperature below about 90K. The second material is a seeding powder of bismuth strontium calcium copper oxide or (bismuth, lead) strontium calcium copper oxide, and includes at least 20 volume percent 2223 phase. The amount of seeding material added to the mixture is selected to result in an amount of 2223 phase in the mixture of about 2-50 weight percent. The mixture is annealed in an oxidizing atmosphere at a temperature of at least about 845.degree. C. and below the melting temperature of the 2223 phase, for a time sufficient to increase the amount of 2223 phase in the mixture. In an alternate embodiment, one or both of the superconducting materials in the mixture are provided by drying, calcining, and annealing a precursor mixture of a Sr(NO.sub.3).sub.2 solution, a Ca(NO.sub.3).sub.2, solution, a Cu(NO.sub.3).sub.2 solution, a Bi.sub.2 O.sub.3 powder, and a PbO powder.
REFERENCES:
patent: 4990493 (1991-02-01), Lay
S. R. Su et al., "Novel Method of Synthesis for the 110 Phase of (BiPb).sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.10 Materials in the Form of Wires and Thick Films," Presented at NATO Advanced Study Institute--Physics and Materials Science of HTS (Abstract published in Proceedings--Physics and Materials of high T.sub.c Superconductors) Halkidiki, Greece (Aug. 18-31, 1991).
Bos Steven
Craig Frances P.
GTE Laboratories Incorporated
Lewis Michael
LandOfFree
Formation of the high TC 2223 phase in BI-SR-CA-CU-O by seeding does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Formation of the high TC 2223 phase in BI-SR-CA-CU-O by seeding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Formation of the high TC 2223 phase in BI-SR-CA-CU-O by seeding will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2377544