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马小波,张胜楠,于泽明,刘国庆,焦磊,郑会玲,李成山,张平祥,李金山.降温速率对Bi-2223/AgAu带材微观结构和传输性能的影响[J].稀有金属材料与工程(英文),2019,48(6):1814~1818.[Ma Xiaobo,Zhang Shengnan,Yu Zeming,Liu Guoqing,Jiao Lei,Zheng Huiling,Li Chengshan,Zhang Pingxiang and Li Jinshan.Effects of cooling rate on the microstructures and transport properties of AgAu sheathed Bi-2223 tapes[J].Rare Metal Materials and Engineering,2019,48(6):1814~1818.]
Effects of cooling rate on the microstructures and transport properties of AgAu sheathed Bi-2223 tapes
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Received:January 03, 2018  Revised:January 16, 2018
DOI:
Key words: High temperature superconductor  (Bi, Pb)-2223/AgAu tapes  Cooling rate  microstructure  critical current density
Foundation item:国家磁约束核聚变能发展计划
Author NameAffiliation
Ma Xiaobo,Zhang Shengnan,Yu Zeming,Liu Guoqing,Jiao Lei,Zheng Huiling,Li Chengshan,Zhang Pingxiang and Li Jinshan  
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Abstract:
      Monofilament AgAu sheathed Bi-2223 tapes were fabricated by powder in tube (PIT) process. The influences of cooling rate during the second heat treatment process (HT2) on the phase composition, microstructures and transport properties of Bi-2223/AgAu tapes were systematically investigated. It was noticed that after the HT2 process, the content of Pb-rich Pb3Sr2.5Bi0.5Ca2CuOy (3321) phase increased with the decreasing cooling rate, while the size of CuO phase particles became bigger. With the cooling rate decreasing from 600 °C /h to 1 °C /h, the critical current density, Jc increased from 7 kA/cm2 to the maximum value of 11.5 kA/cm2, which increased for 64%. Meanwhile the current capacities in magnetic field of these Bi-2223/AgAu tapes have also been enhanced with slow cooling process, attributed to the improvements of both the intergrain connectivity and the flux pinning properties.