Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Fabrication of Superconducting Joints between 61 Filaments of BSCCO 2223 Tapes

61심 BSCCO 2223 고온초전도 선재의 접합부 제조

  • Published : 1998.02.01
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Abstract

High-temperature superconducting joints between 61 filaments of Bi-2223 tapes were fabricated by chem-ical corrosion and repeated thermomechanical process. The silver sheath of the superconducting tape was chemically removed using chemical etchant(NH4OH:H2O2=1:1) from one side of each tape without altering the form of lap joint. The joined region was formed by uniaxial pressing and a series of thermomechanical process and then subjected to properties measurement and microstructural analysis. The critical current(Ic) variation and I-V characteristics along the joint were mesured with several configuration of proble points. Ic value of the transition region of the joint inthe multifilament tape which limit the total current carring capacity of the superconducting tape was higher than that of monofilament tape. But the transition ex-ponent n-value of the multi-filament tape was lower than that of monofilament wire due to the interaction of the individual superconducting core of the multi-filament. The critical current through the joint area was improved by respeated press and reaction annealing treatment.

고온초전도체 61심 Bi-2223 선재간의 초전도 접합부위를 화학적 부식 및 열적· 기계적 반복 공정에 의하여 제조하였다. 초전도 선재 테이프의 은 피복재 한쪽 표면을 초전도체와 반응하지 않는 부식액(NH4OH:H2O2=1:1)으로 화학적으로 제거한 다음, 두 시편을 일출가압 성형하여 접합시편을 제조하였고 일련의 서로 다른 열적· 기계적 처리를 거쳐 접합부의 물성 및 미세구조를 분석하였다. 접합부를 따라 임계전류(Ic) 변화와 전류전압 곡선의 특성을 측정하기 위하여 여러 단자를 접합부 주위에 설치하여 부위별 I~V 특성을 측정한 결과 단심선재에 비하여 다심선재에서 선재 전체의 통전 능력을 좌우하는 천이구간의 임계전류값이 높았다. 그러나 단심에 비해 다심선재는 천이급속도를 나타내는 n값이 다심선재내 각각의 초전도 core들의 상호작용에 의하여 낮은 값을 나타내었다. 접합부의 임계전류 통전성은 반복적인 가압성형 공정과 서냉반응 열처리 공정에 의하여 향상되었다.

Keywords

References

  1. J. Am. Ceram. Soc. v.80 no.5 Fundamental material Aspects underlying the Preparation of High Temperature Superconducting $(Bi,Pb)_{2+x}Sr_2Ca_2Cu_3O_{10+d}$ Ceramics P. Majewski;S. Kaesche;F. Aldinger
  2. Physica v.C 201 Phase Diagram of the System $Bi_1.6Pb_0.4Sr_2CuO_6-Ca-CuO_2\;Between\;825^{\circ}C\;and\;110\;0^{circ}C$ P. Strobel;J.C. Toledano;D. Morin;J. Schneck;G. Vacquier;O. Monnereau;J. Primot;T. Fournier
  3. J. Am. Ceram. Soc. v.76 no.3 Supersolidus Phase Investigation of the Bi-Sr-Ca-Cu Oxide System in Silver Tape R.R. Schartman;R. Sakidja;E.E. Hellstrom
  4. Physica v.C235-240 The Phase Equilibria in the $Bi_1.5O-SrO-CaO-CuO$ system M.Nevriva;K. Knizek;E. Pollert
  5. Physica v.C235-340 Phase Diagram in the (Bi,Pb)-Sr-Ca-Cu-O System:Influence of Partial Oxygen Pressure M.Mansori;P. Satre;M. Roubin;G. Vacquier;P. Strobel;A. Sebaouna
  6. Physica v.C15-189 The Phase Equilibria of $Bi_2Sr_2Ca_2Cu_3O_{10}$ in the System $Bi_2O_3-SrO-CaO-CuO$ P. Majewski;B. Hettich;K. Schulze
  7. Appl. Phys. Lett. v.65 no.22 Phase Equilibria and Melt Processing of $Bi_2Sr_2Ca_1Cu_2O_{8+x}$ Tapes at Reduced Oxygen partial Pressures J.L.MacManus-Driscoll;P.P.Wang;John.C.Bravman
  8. Physica v.C248 The Intermediate Phase During (Bi,Pb)2 $Sr_2CaCu_2O_{8+δ}$ Phase Transformation W. Bian;Y. Zhu;Y.L. Wang;M. Suenaga
  9. Physica v.C243 Phase Compatibilities in the Bi-poor Region of the system Bi-Sr-Ca-O at 820 and 900℃ in air R. Muller;M.Cantoni;L.J. Gauckler
  10. Physica v.C153-155 Studies of Oxygen Deficient $Ba_2YCu_3O_{7+d}$ and Superconductivity $B_1(Pb)-Sr-Ca-CuO$ R. J. Cava;B. Batlogg;S. A. Sunshine;T. Siegrist;R. M. Fleming;K. Rabe;L. F. Schneemeyer;D. W. Murphy;R. B. van Dover;P. K. Gallagher;S. H. Glarum;S. Nakahara;R. C. Farrow;J. J. Krajewski;S. M. Zahurak;J. V. Waszczak;J. H. Marshall;P. Marsh;L. W. Rupp, Jr.;W. F. Peck;E. A. Rietman
  11. Physica v.C157 Stabilizing the High-Tc Superconductor $Bi_2Sr_2Ca_2Cu_3O_{10+x}$ by Pb Substitution B. W. Statt;Z. Wang;M. J. G. Lee;J. V. Yakomie;P. C. de Camargo;J. F. Maya;J. W. Rutter
  12. Nature v.333 High-Tc Superconducting Phases in the Series $Bi_2.1(Ca,Sr)_{n+1}Cu_nO_{2n+4+d}$ J. L. Tallon;R. G. Buckley;P. W. Gilberd;M. R. Presland;I. W. M. Brown;M. E. Bowden;L. A. Christian;R. Goguel
  13. Phys. Rev. v.B41 Dissipative Flux Motion in High-temperature Superconductors T. T. M. Palstra;B. Batlogg;R. B. Van Dover;L. F. Schneemeyer;J. V. Waszczak
  14. Superconducting Joints Formed Between Powder-in-Tube $Bi_2Sr_2Ca_2Cu_3O_2/Ag$ Tapes J. E. Tkaczyk;R. H. Arendt;P. J. Bednarczyk;M. F. Garbauskas;B. A. Jones;R. J. Kilmer;K. W. Lay
  15. MRS Bulletin Important Considerations for Processing Bi-Based High-Temperature Superconducting Tapes and Films for Bulk Applications E. E. Hellstrom