• 제목/요약/키워드: Bi-9Pb)-Sr-Ca-Cu-O (Bi-2223) superconductor tape : critical current : current capacity : resistance to thermal shock : bonding strength : bending strain : lap-joint : scarf-joint

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BSCCO(2223) 초전도 선재의 접합공정 연구 (A Study of Joining Method of BSCCO(2223) Tape)

  • 김정호;김중석;김태우;지붕기;주진호;나완수
    • 한국초전도ㆍ저온공학회논문지
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    • 제1권2호
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    • pp.1-7
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    • 1999
  • we evaluated the effects of joining process such as contact method. shape of joined area and pressure on the electrical and mechanical properties of Bi-2223 superconducting tape, Specifically. the current capacity of the jointed tape was measured as a function of uniaxial pressure. and the thermal shock, bonding strength and the thermal of the tape were evaluated and correlated to the microstructural evolution. It was observed that the current capacity was significanrly dependent on the uniaxial pressure The jointed tape, fabricated with a pressure of 1,000-1,600 Mpa. showed the highest value of current capacity results from improvements in core density, contacting area and grain alignment, ect. In addition, the strength of jointed tape was measured to be 86 Mpa, which is about 88% of the unjoined ape's strength. The irreversible strain($\varepsilon$irrev) for the jointed tape was measured to be 0.1%, smaller than that of unjoined tape ($\varepsilon$irrev= 0.3%). The decrease in the strength and irreversible strain for jointed tape is believed to be due to the irregular geometry/morphology of the transition area of the tape.

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