Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference (한국초전도저온공학회:학술대회논문집)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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The effects of starting precursor conditions on the phase formation and transport properties of Bi-2223/Ag tapes

  • Chunhai Jiang (Materials Engineering Dept., Korea Institute of Machinery ＆ Materials) ;
  • Jaimoo Yoo (Materials Engineering Dept., Korea Institute of Machinery ＆ Materials) ;
  • Jaewoong Ko (Materials Engineering Dept., Korea Institute of Machinery ＆ Materials) ;
  • Kim, Haidoo (Materials Engineering Dept., Korea Institute of Machinery ＆ Materials) ;
  • Hyungsik Chung (Dept. of Molecular Science and Technology, Ajou University)
  • Published : 2002.02.01
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Abstract

The influence of starting precursor powders on the phase formation and transport properties of Bi-2223/Ag tapes has been studied. The experimental results show that the average particle size of precursors as fine as 1.64 ${\mu}{\textrm}{m}$ and 1.51 ${\mu}{\textrm}{m}$ can still increase the transport properties. The J$_{c}$-B behavior is also enhanced in tapes fabricated with powders in finer particle sizes. However, at higher magnetic fields, J$_{c}$ of tape started from the powder with the finest particles drops rapidly at the direction of H//c, which is possibly attributed to the small grain sizes and weak flux pinning ability that due to the short induction period at the initial stage of phase formation as the result of fine particles in precursor powder.der.

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