Texturing of high T{sub c} superconducting polycrystalline fibers/wires by laser-driven directional solidification in an thermal gradient
This paper summarizes the technique of laser-driven directional solidification in a controlled thermal gradient of yttria stabilized zirconia core coated Y-Ba-Cu-O materials to produce textured high T{sub c} superconducting polycrystalline fibers/wires with improved critical current densities in the extended range of magnetic fields at temperatures greater than 77 K. The approach involves laser heating to minimize phase segregation by heating very rapidly through the two-phase incongruent melt region to the single phase melt region and directionally solidifying in a controlled thermal gradient to achieve highly textured grains in the fiber axis direction. The technique offers a higher grain growth rate and a lower thermal budget compared with a conventional thermal gradient and is amenable as a continuous process for improving the J{sub c} of high T{sub c} superconducting polycrystalline fibers/wires. The technique has the advantage of suppressing weak-link behavior by orientation of crystals, formation of dense structures with enhanced connectivity, formation of fewer and cleaner grain boundaries, and minimization of phase segregation in the incongruent melt region.
- Research Organization:
- National Aeronautics and Space Administration, Houston, TX (United States). Lyndon B. Johnson Space Center
- OSTI ID:
- 135355
- Report Number(s):
- N-96-10230; NASA-CP-3290-VOL-1; S-792-VOL-1; NAS-1.55:3290-VOL-1; CONF-940627-; CNN: NSF ISI-91-01565; TRN: 9610252
- Resource Relation:
- Conference: 4. international conference and exhibition of the World Congress on Superconductivity, Orlando, FL (United States), 27 Jun - 1 Jul 1994; Other Information: PBD: Apr 1995; Related Information: Is Part Of Proceedings of the 4th International Conference and Exhibition: World Congress on Superconductivity, volume 1; Krishen, K.; Burnham, C.; PB: [10] p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Melt-textured growth of polycrystalline YBa/sub 2/Cu/sub 3/O/sub 7/. sqrt. /sub delta/ with high transport J/sub c/ at 77 K
Laser deposition of biaxially textured yttria-stabilized zirconia buffer layers on polycrystalline metallic alloys for high critical current Y-Ba-Cu-O thin films