δείτε την πρωτότυπη σελίδα τεκμηρίου στον ιστότοπο του αποθετηρίου του φορέα για περισσότερες πληροφορίες και για να δείτε όλα τα ψηφιακά αρχεία του τεκμηρίου*
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)
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)
*Η εύρυθμη και αδιάλειπτη λειτουργία των διαδικτυακών διευθύνσεων των συλλογών (ψηφιακό αρχείο, καρτέλα τεκμηρίου στο αποθετήριο) είναι αποκλειστική ευθύνη των αντίστοιχων Φορέων περιεχομένου.
Βοηθείστε μας να κάνουμε καλύτερο το OpenArchives.gr.