The effect of heat treatment on explosively compacted (Y-Ba-K-Cu-O) superconductive powders

 
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The effect of heat treatment on explosively compacted (Y-Ba-K-Cu-O) superconductive powders (EN)

Mamalis, AG (EN)
Kotsis, I (EN)
Szalay, A (EN)
Enisz, M (EN)
Pantazopoulos, G (EN)
Manolakos, DE (EN)

N/A (EN)

A ceramic powder mixture corresponding to the stoichiometric ratio of YBa1.95K0.05Cu3Oy superconducting ceramic with 10% w/w Ag was heat treated at 950 degrees C for 3 h in flowing oxygen. The resultant superconducting powder was consolidated in a silver tube by the explosive compaction technique (pre-heat treated ceramic). The same fabrication technique, i.e. explosive compaction, was employed to the initial stoichiometric powder mixture, without prior heat treatment and the green product was subsequently subjected to a series of heat-treating cycles (920 degrees C, 70 h), in order to obtain the required superconducting properties (post-heat treated ceramic). The microstructure and physical properties of the pre-and post-heat treated ceramics were analyzed and compared using various characterization techniques. X-ray diffraction performed on the pre-heat and post-heat treated ceramics indicated that maximum 123-phase content retained in the former case (pre-heat treated ceramic), whilst DC magnetic susceptibility measurements have shown the characteristic Meissner shielding effect at 99 and 92 K, respectively. Furthermore, the pre-heat treated compacted billet was characterized by a critical current density, J(c) equal to 2800 A/cm(2) at 77 K after suitable annealing at 850 degrees C for 10 h in oxygen stream. (C) 1997 Elsevier Science B.V. (EN)

journalArticle

X Ray Diffraction (EN)
Stoichiometry (EN)
Annealing (EN)
Magnetic permeability measurement (EN)
Powders (EN)
Shielding Effectiveness (EN)
Critical current density (superconductivity) (EN)
Superconductivity (EN)
Magnetic Susceptibility (EN)
High temperature superconductors (EN)
Meissner shielding effects (EN)
Microstructures (EN)
Compaction (EN)
Critical Current Density (EN)
Magnetic shielding (EN)
X ray diffraction analysis (EN)
Heat Treatment (EN)
Yttrium compounds (EN)
Explosive compaction technique (EN)
Oxide superconductors (EN)
Ceramic materials (EN)
Yttrium barium potassium copper oxide (EN)
Physical Properties (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

Physica C: Superconductivity and its Applications (EN)

1997


ELSEVIER SCIENCE BV (EN)



*Η εύρυθμη και αδιάλειπτη λειτουργία των διαδικτυακών διευθύνσεων των συλλογών (ψηφιακό αρχείο, καρτέλα τεκμηρίου στο αποθετήριο) είναι αποκλειστική ευθύνη των αντίστοιχων Φορέων περιεχομένου.