Superconducting bulk magnets: Very high trapped fields and cracking

Gruss, S.; Fuchs, G.; Krabbes, G.; Verges, P.; Sto¨ver, G.; Mu¨ller, K.-H.; Fink, J.; Schultz, L.
November 2001
Applied Physics Letters;11/5/2001, Vol. 79 Issue 19, p3131
Academic Journal
Improved trapped fields are reported for bulk melt-textured YBa[sub 2]Cu[sub 3]O[sub 7-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. © 2001 American Institute of Physics.


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