Superconducting bulk magnets: Very high trapped fields and cracking
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In this article, the authors reported improved trapped fields for bulk melt-textured YBa2Cu3O7−δ (YBCO) material in the temperature range between 20 and 50 K.Abstract:
Improved trapped fields are reported for bulk melt-textured YBa2Cu3O7−δ (YBCO) material in the temperature range between 20 and 50 K. Trapped fields up to 12.2 T were obtained at 22 K on the surface of single YBCO disks (with Ag and Zn additions). In YBCO minimagnets, maximum trapped fields of 16 T (at 24 K) and of 11,2 T (at 47 K) were achieved using (Zn+Ag) and Zn additions, respectively. In all cases, the YBCO disks were encapsulated in steel tubes in order to reinforce the material against the large tensile stress acting during the magnetizing process and to avoid cracking. We observed cracking not only during the magnetizing process, but also as a consequence of flux jumps due to thermomagnetic instabilities in the temperature range betweeen 20 and 30 K.read more
Citations
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A trapped field of 17.6 T in melt-processed, bulk Gd-Ba-Cu-O reinforced with shrink-fit steel
John H. Durrell,Anthony R. Dennis,Jan Jaroszynski,Mark D. Ainslie,Kysen G Palmer,Yunhua Shi,A.M. Campbell,John R. Hull,M. Strasik,Eric E. Hellstrom,David A. Cardwell +10 more
TL;DR: In this paper, the authors reported a trapped field of 17.6 T in a stack of two silver-doped GdBCO superconducting bulk samples, each 25 mm in diameter, fabricated by top-seeded melt growth and reinforced with shrink-fit stainless steel.
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TL;DR: In this article, the authors present the present status of high temperature superconductors (HTS) and of bulk superconducting magnet devices, their use in bearings, in flywheel energy storage systems (FESS) and linear transport magnetic levitation (Maglev) systems.
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Superconductively levitated transport system - the SupraTrans project
Ludwig Schultz,O. de Haas,P. Verges,C. Beyer,S. Rohlig,H. Olsen,Lars Kuhn,Dietmar Berger,U. Noteboom,U. Funk +9 more
TL;DR: SupraTrans as discussed by the authors is an innovative transportation concept based on the principle of superconductive magnetic levitation, which uses the flux pinning in high temperature superconductors (HTS) to stabilize the lateral and vertical position of the vehicle on the magnetic track.
Journal ArticleDOI
A practical route for the fabrication of large single-crystal (RE)-Ba-Cu-O superconductors.
TL;DR: The process is based primarily on the development of a new type of generic seed crystal that can effectively promote the epitaxial nucleation of any (RE)BCO system and suppressing the formation of RE–Ba solid solution in a controlled manner within large grains processed in air.
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From RE-211 to RE-123. How to control the final microstructure of superconducting single-domains
TL;DR: In this article, a review of the usual techniques for producing YBCO-type single-domains and the microstructure of the as-obtained samples are discussed in detail and the formation of microstructural defects, such as pores and cracks, is examined.
References
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Journal ArticleDOI
Damage caused by magnetic pressure at high trapped field in quasi-permanent magnets composed of melt-textured YBaCuO superconductor
TL;DR: In this article, a mini-magnet fabricated from four melt-textured YBa2Cu3O7 - delta (MT-YBCO) discs activated at 49 K using an applied field of 14 T was observed to crack.
Journal ArticleDOI
Trapped magnetic fields larger than 14 T in bulk YBa2Cu3O7−x
TL;DR: In this article, high trapped fields were found in zinc-doped, bulk melt-textured YBa2Cu3O7−x (YBCO) material showing a pronounced peak effect in the field dependence of the critical current density.
Journal ArticleDOI
Zn doping of YBa2Cu3O7 in melt textured materials: peak effect and high trapped fields
G. Krabbes,G. Fuchs,P. Schätzle,S Gruß,Jai Won Park,Ferdinand Hardinghaus,G Stöver,Roland Hayn,S.-L. Drechsler,T Fahr +9 more
TL;DR: In this article, a modified melt crystallization process (MMCP) was applied to prepare single grain YBCO bulk material with Zn partially substituting for Cu. Hole doping was controlled by an appropriate oxidizing treatment of the as-grown bulk.
Journal ArticleDOI
Modified melt texturing process for YBCO based on the polythermic section YO1.5“Ba0.4Cu0.6O” in the YBaCuO phase diagram at 0.21 bar oxygen pressure
G. Krabbes,P. Schätzle,Wolfgang Bieger,Ulrich Wiesner,G Stöver,M. Wu,T. Strasser,A. Köhler,Doris Litzkendorf,K. Fischer,P. Görnert +10 more
TL;DR: Based on phase diagram considerations, it is shown that the process window for stable growth conditions can be considerably increased as discussed by the authors, and a lower process temperature (T a =960°C to 985°C) is possible.
Journal ArticleDOI
Enhancements in Current Density and Mechanical Properties of Y-Ba-Cu-O/Ag Composites
Dominic F. Lee,Kamel Salama +1 more
TL;DR: In this article, a liquid-phase processing method was developed to manufacture bulk YBa2Cu3Ox/Ag superconducting composites with large current carrying capacity and enhanced mechanical properties.
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