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Influence of CaCuO2 particle size on the phase evolution of Bi-based high temperature superconductors based on Two-powders Route
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Northwest Institute of Non-ferrous Metal Research

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National Science Foundation of China under contract No. 51472206; the National ITER program of China under contract No. 2013GB110001; and National Key Research and Development Program 2017YFB0902303

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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.

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[ZHANG SHENGNAN, Yingjian Huang, Xiaobo Ma, Lijun Cui, Guoqing Liu, Huiling Zheng, Xiaoyan Xu, Gaofeng Jiao, Chengshan Li, Jianqing Feng, Guo Yan, 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.]
DOI:10.12442/j. issn.1002-185X. E20180038

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History
  • Received:November 22,2018
  • Revised:December 11,2018
  • Adopted:February 21,2019
  • Online: June 05,2020
  • Published: