caa a22 4500 38802156X CHVBK 20180307124926.0 cr unu---uuuuu 161130e199802 xx s 000 0 eng 10.1557/JMR.1998.0036 doi S0884291400042734 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0036 Effect of sintering temperature and cooling rate on microstructure, phase formation, and critical current density of Ag-sheathed Bi1.8Pb0.4Sr2Ca2Cu3Ox superconducting tapes [Elektronische Daten] Silver-sheathed Bi-Pb-Sr-Ca-Cu-O (2223) superconducting tapes (with a starting composition of Bi1.8Pb0.4Sr2Ca1Cu2O8, calcium cuprate, and CuO) were fabricated by the powder-in-tube technique. The tapes were sintered at various temperatures to optimize the formation of Bi1.8Pb0.4Sr2Ca2Cu3O10 phase within the tape. The results show that sintering within the temperature range of 815-825 °C can produce tapes with high critical current density (Jc). The Jc of samples sintered at the higher temperature of 825 °C, where more liquid is present, depended markedly on the rate at which tapes were cooled from the sintering temperature; samples sintered at lower temperatures did not exhibit such a cooling-rate effect. The optimum combination of phase purity and microstructure that yielded an average transport Jc of ≥ 2.5 × 104 A/cm2 was obtained when the tapes were sintered at 825 °C for 150 h and cooled at a rate of 25 °C/h from the sintering temperature. Quenching studies indicate that the Bi-2223 phase becomes unstable below 700 °C during slow cooling. This result may have important implications for processing Bi-Sr-Ca-Cu-O tapes with high Jc. Addition of 15 vol.% Ag flakes to the monolithic core exerted no significant effect on Jc. Copyright © Materials Research Society 1998 Singh J. P. Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439 Vasanthamohan N. Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439 Journal of Materials Research Cambridge University Press 13/2(1998-02), 261-268 0884-2914 13:2<261 1998 13 JMR https://doi.org/10.1557/JMR.1998.0036 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0036 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Singh J. P. Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439 NATIONALLICENCE 700 1- Vasanthamohan N. Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/2(1998-02), 261-268 0884-2914 13:2<261 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge