Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Process of making wire – tape – cable – coil – or fiber
Patent
1992-05-12
1997-11-04
Gorski, Joseph M.
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Process of making wire, tape, cable, coil, or fiber
29599, 505433, 505500, 505736, 505742, 505740, H01L 3924
Patent
active
056839693
ABSTRACT:
A strongly-linked polycrystalline oxide superconductor article includes an oxide superconductor selected from the group consisting 124-type and 247-type oxide superconductors having fine, highly aligned oxide superconductor grains less than 50 .mu.m along a longest dimension. The oxide superconductor article has at least a 25% retention of critical current density in a 0.1 Tesla field. A method for preparing a strongly-linked oxide superconductor includes shaping a finely divided metallic precursor of an oxide superconductor; oxidizing the finely divided metallic precursor to produce a finely divided sub-oxide species while avoiding conversion of an appreciable amount of the sub-oxide species into the oxide superconductor; annealing and deforming the article, in either order, the annealing carried out at a temperature and for a time sufficient to convert some of the sub-oxide species into fine grains of the oxide superconductor thereby forming a mixture of sub-oxide species and oxide superconductor and the deformation carried out such that the fine grains of oxide superconductor are rotated into alignment parallel to an intended current carrying direction of the article without fracturing or pulverization of the oxide superconductor grains; alternating annealing and deformation of the article until no further improvement in alignment is observed; and subjecting the aligned grains to a final anneal in order to react any remaining sub-oxide species and maximize the growth and sintering of existing aligned grains.
REFERENCES:
patent: 5034373 (1991-07-01), Smith et al.
patent: 5093314 (1992-03-01), Takahashi et al.
patent: 5204316 (1993-04-01), Arendt et al.
patent: 5246917 (1993-09-01), Hikata et al.
patent: 5424282 (1995-06-01), Yamamoto et al.
"Resolutions to difficulties experienced in SSC cable fabrication during the initial scale-up period" Hannaford et al. IEEE Transactions on Magnetics. 27(2):2024-2026 (Mar. 1991).
"Preparation of Y-Ba-Cu-O superconducting tape by pyrolysis of organic acid salts" Amemiya et al. IEEE Transactions on Magnetics. 27(2):905-908 (Mar. 1991).
"Pressure Effect on T.sub.c of Superconductor YBa.sub.2 Cu.sub.4 O.sub.8 " Yamada et al. Jap. J. Appl. Phys. 29(2)L250-253 (Feb. 1990).
"Calcium-substituted Y-Ba-Cu-O superconductors with enhanced T.sub.c synthesized at elevated oxygen pressures" Morris et al. Phys. Rev. B. 41(7):4118-4122 (Mar. 1990).
"High-pressure studies on the 90K superconductors Y.sub.2 Ba.sub.4 Cu.sub.7 O.sub.15 and (Y/Ca)Ba.sub.2 Cu.sub.4 O.sub.8 " Tallon et al. Physica C. 167(1&2):236-242 (Apr. 15, 1990).
"A new domain structure in YBa.sub.2 Cu.sub.3 O.sub.7-x prepared by the quench and melt growth (QMG) process" Kimura et al. Physica C. 174(4-6):263-272 (Mar. 15, 1990).
T. Miyatake, et al. "Critical Current Densities and Microstructure of YBa.sub.2 Cu.sub.4 O.sub.8 " from the Proceedings of ISS '90, Sendai, Japan, Nov., 1990; Advances in Superconductivity III: Springer-Verlag, Tokyo, Japan 1991).
T. Miyatake, et al. "Critical Current Densities of Y.sub.1-x Ca.sub.x Ba.sub.2 Cu.sub.4 O.sub.8 (x=0 and 0.1) Superconducting Ceramics" Jap. J. Appl. Phys. 29(7), L1079-L1082 (Jul., 1990).
T. Miyatake, et al. "90K Superconductivity in Ca-Substituted YBa.sub.2 Cu.sub.4 O.sub.8 ".
R. B. Poeppel, et al. "Fabrication and Wire Extrusion of Ceramic Superconductors" Proceedings of the Second Topical Conference on Emerging Technologies in Materials, San Franciso, CA (Nov. 6-9, 1989) with a May, 1991 date on the title page.
J. Horn, et al. "On the Preparation of Y.sub.1 Ba.sub.2 Cu.sub.4 O.sub.8 " Solid State Comm. 79(6), 483-486 (1991).
R. K. Williams, et al. "Preparation and grain boundary chemistry of dense polycrystalline YBa.sub.2 Cu.sub.4 O.sub.-8 " J. Appl. Phys. 69(4), 2426-2430 (Feb. 15, 1991).
S. Hayashi, et al. "Properties of Ag-Sheathed Bi-2223, Bi-2212 and Y-124 Superconducting Wires" ICMC '90 Topical Conference with a received stamp date of Oct. 16, 1990.
A. Otto, et al. "Superconducting Properties and Formation of Yb.sub.2 Ba.sub.4 Cu.sub.7 O.sub.14-x " Physica C 160, 352-360 (1989).
T. Kogure, et al. "Formation of Yb.sub.n Ba.sub.2n Cu.sub.3n+1 O.sub.x (n=3,4) by oxidation of Yb-Ba-Cu-Ag Metallic Precursors" Physica C 157, 159-163 (1989).
Excerpt from Superconductor Week regarding "CryoPower Associates", p. 7, Dec. 16, 1991.
S. Chadda, et al. "Synthesis of YBa.sub.2 Cu.sub.3 O.sub.7-y and YBa.sub.2 Cu.sub.4 O.sub.8 by Aerosol Decomposition" J. Aerosol Sci. 22(5), 601-616 (1991) with a received stamp date of May 6, 1991.
K. H. Sandhage, et al. "Critical Issues in the OPIT Processing of High-J.sub.c BSCCO Superconductors" J. Min. Met. Matl. 43(3), 21-25 (Mar., 1991).
J. W. Ekin et al. "Transport critical current of aligned polycrystalline Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-.delta. and evidence for a noneweak-linked component of intergranular current conduction" J. Appl. Phys. 68(5), 2285-2295 (Sep. 1, 1990).
K. Shibutani, et al. "J.sub.c -B Characteristics of Silver Sheathed Superconductors" IEEE Trans. Mag. 27, 897-900 (1991).
T. Kogure, et al. "Microstructure of Yb.sub.2 Ba.sub.4 Cu.sub.7 O.sub.x /Ag Composites Produced by Oxidizing Metallic Precursors" Physica C 157, 351-357 (1989).
T. Kogure, et al. "Superconducting Yb.sub.2 Ba.sub.4 Cu.sub.7 O.sub.x Produced by Oxidizing Metallic Precursors" Physica C 156 45-56 (1988).
Masur Lawrence J.
Podtburg Eric R.
American Superconductor Corporation
Gorski Joseph M.
LandOfFree
Strongly-linked oxide superconductor and a method of its manufac does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Strongly-linked oxide superconductor and a method of its manufac, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Strongly-linked oxide superconductor and a method of its manufac will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1832979