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Effects of cooling rate on the microstructures and transport properties of AgAu sheathed Bi-2223 tapes
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1.State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an;2.Northwest Institute for Nonferrous Metal Research,Xi’an

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Fund Project:

National Key Project of Magneto-Constrained Fusion Energy Development Program (2015GB115001)

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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.

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[Ma Xiaobo, Zhang Shengnan, Yu Zeming, Liu Guoqing, Jiao Lei, Zheng Huiling, Li Chengshan, Zhang Pingxiang, 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.]
DOI:10.12442/j. issn.1002-185X.20180012

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History
  • Received:January 03,2018
  • Revised:January 16,2018
  • Adopted:February 09,2018
  • Online: July 30,2019
  • Published: