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张胜楠,黄英健,马小波,崔利军,刘国庆,郑会玲,徐晓燕,焦高峰,李成山,冯建情,闫果,张平祥.CaCuO2颗粒尺寸对双粉法制备Bi系高温超导带材性能的影响[J].稀有金属材料与工程(英文),2020,49(5):1469~1475.[ZHANG SHENGNAN,Yingjian Huang,Xiaobo Ma,Lijun Cui,Guoqing Liu,Huiling Zheng,Xiaoyan Xu,Gaofeng Jiao,Chengshan Li,Jianqing Feng,Guo Yan and Pingxiang Zhang.Influence of CaCuO2 particle size on the phase evolution of Bi-based high temperature superconductors based on Two-powders Route[J].Rare Metal Materials and Engineering,2020,49(5):1469~1475.]
Influence of CaCuO2 particle size on the phase evolution of Bi-based high temperature superconductors based on Two-powders Route
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Received:November 22, 2018  Revised:December 11, 2018
DOI:
Key words: High temperature superconductor  Bi-2212  Precursor powder  Phase evolution dynamic  Microstructure
Foundation item:国家自然科学基金面上项目No.51472206; 国家热核聚变堆计划No.2013GB110001;国家重点研发计划No.2017YFB0902303
Author NameAffiliation
ZHANG SHENGNAN,Yingjian Huang,Xiaobo Ma,Lijun Cui,Guoqing Liu,Huiling Zheng,Xiaoyan Xu,Gaofeng Jiao,Chengshan Li,Jianqing Feng,Guo Yan and Pingxiang Zhang  
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Abstract:
      Bi1.76Pb0.34Sr1.93Ca2.0Cu3.06O8+d (Bi-2223) precursor powders were fabricated with a two-powder route based on co-precipitation process. During this process, Bi1.76Pb0.34Sr1.93CaCu2.06O8+d (Bi, Pb-2212) and CaCuO2 (with the actual phase composition of Ca2CuO3 and CuO) powders were first synthesized and calcinated separately, then mixed together before packed into Ag sheath. By tuning the pH values during the co-precipitation process, CaCuO2 powders with different average particle size of ~1.10, 0.75, and 0.60 mm were obtained, respectively. Then single filament Bi-2223/Ag tapes were fabricated by powder in tube (PIT) process with precursor powders obtained by mixing the different particle sized CaCuO2 powders and well-calcinated Bi-2212 powders. The influences of CaCuO2 particle size on microstructure, phase evolution dynamics and superconducting current capacity of sintered Bi-2223 tapes were systematically studied. Due to higher uniformity of Ca2CuO3 and CuO distribution in filaments, clustering of secondary phases and insufficiently reacted areas were effectively avoided. Therefore, higher current capacity of ~12200 Acm-2 was obtained on the 1# tape by further optimizing the final dimension of the tapes.