• Title/Summary/Keyword: 선재

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A study on the process for the preparation of Ag/Bi-2223 superconducting tapes by powder in tube methoe (분말충진법에 의한 Ag/Bi-2223고온초전도 선재의 제조공정에 관한 연구)

  • Kim, U-Gon;Lee, Ho-Jin;Won, Dong-Yeon;Hong, Gye-Won
    • Korean Journal of Materials Research
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    • v.4 no.4
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    • pp.406-415
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    • 1994

  • The effects of fabrication method and condition on critical current density of Ag sheathed Bi- 2223 superconducting tapes by powder-in-tube method were studied. The highest critical current density (Jc) in the whole process was measured in the repeative heat treatment of 250 hour and mechanical deformation of 2 times. These results are suggested that the high-Tc phase at the heat treatment of 250 hour was superior and the good grain alignment at the mechanical deformation of 2 times was analyzed by XRD pattern. The highest critical current density obtained by pressing method was $1.05\times 10^4A/\textrm{cm}^2$ and $0.78\times 10^4A/\textrm{cm}^2$ in case of rolling method. The multifilamentary wires with 7 and 49 filaments were fabricated to check the applicability of pressing and rolling method for preparing multifilaments wire. The critical current density of 7 filaments tapes prepared by pressing showed $0.45 \times 10^{4}A/\textrm{cm}^2$ and $0.20 \times 10^{4}A/\textrm{cm}^2$ for 49 filaments tapes prepared by rolling.

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해외동향

  • Korea Electrical Manufacturers Association
    • NEWSLETTER 전기공업
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    • no.97-23 s.192
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    • pp.16-23
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    • 1997

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