| Автор | D W A Willen |
| Автор | C Richer |
| Автор | P R Critchlow |
| Автор | M Goyette |
| Автор | R Nadi |
| Автор | J R Cave |
| Автор | G Quirion |
| Автор | M Aubin |
| Дата выпуска | 1995-05-01 |
| dc.description | Parameters that promote rapid formation of aligned high-T<sub>c</sub> phase in the high-temperature superconductor (Bi,Pb)<sub>2</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>x</sub> (Bi-2223) powder in tube superconducting tapes have been studied. A rapid phase formation was achieved by two means. Firstly, frequent mechanical pressings during the early stages of the heat treatment were applied. The pressings counteract the expansion that occurs during sintering, increase grain connectivity and reduce diffusion distances. Secondly, the fraction of process time within the thermodynamically stable region of the Bi-2223 phase was maximized by ramping of the oxygen partial pressure during heating and cooling. In addition, the starting phase composition of the superconductor powder was found to have a critical influence on the reaction speed. A complex phase composition gave the fastest formation rate of Bi-2223 phase. Within 30 h of processing time, critical current densities exceeding 12 kA cm<sup>-2</sup> (1 mu V cm<sup>-1</sup>, 77 K, 0 T) were obtained compared to 2-4 kA cm<sup>-2</sup> without the above measures. Also, the effect of variations in oxygen partial pressure, pressing schedules, partial melting and a two-component starting powder based on (Bi,Pb)<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>x</sub> were investigated for this process. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Rapid phase formation in Bi-2223/Ag superconducting tapes |
| Тип | paper |
| DOI | 10.1088/0953-2048/8/5/013 |
| Electronic ISSN | 1361-6668 |
| Print ISSN | 0953-2048 |
| Журнал | Superconductor Science and Technology |
| Том | 8 |
| Первая страница | 347 |
| Последняя страница | 353 |
| Аффилиация | D W A Willen; VPTI Hydro-Quebec, Canada |
| Аффилиация | C Richer; VPTI Hydro-Quebec, Canada |
| Аффилиация | P R Critchlow; VPTI Hydro-Quebec, Canada |
| Аффилиация | M Goyette; VPTI Hydro-Quebec, Canada |
| Аффилиация | R Nadi; VPTI Hydro-Quebec, Canada |
| Аффилиация | J R Cave; VPTI Hydro-Quebec, Canada |
| Аффилиация | G Quirion; VPTI Hydro-Quebec, Canada |
| Аффилиация | M Aubin; VPTI Hydro-Quebec, Canada |
| Выпуск | 5 |
