• Title/Summary/Keyword: Cu-sheath, screen printing

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Fabrication of Cu-Sheathed YBCO Thick Films by Screen Printing Method Using $Y_2$BaCu$O_5$ and BaC$O_3$ Powders (Y211 및 BaCO$_3$ 분말로 Screen Printing 법을 이용한 Cu-sheath의 YBCO 후막 제조)

  • 김경진;한상철;한영희;박병삼;정년호;윤희중;오제명;최희락;성태현
    • Progress in Superconductivity
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    • v.5 no.2
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    • pp.132-135
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    • 2004

  • We fabricated YBCO thick films by using a screen printing method with $Y_2$BaCuO$_{5}$(Y211) and BaCO$_3$ powders on Cu-substrate in $N_2$ atmosphere. Cu-sheathed YBCO thick film process is more simple and economic than YBCO coated conductor methods. The heat treatment is performed in the range of 860 - 875 $^{\circ}C$ for 5 min in the tube furnace of $N_2$ atmosphere. The flow rate of $N_2$ gas is fixed 60 $m\ell$/min. Microstructure and phases of thick films were investigated by optical microscope, X-ray diffraction(XRD) and SEM. At heat-treatment temperature, the thick films were partially melted by liquid reaction between CuO of oxidized copper substrate and the powders screen-printed on Cu-sheath. During the heat-treatment procedure, YBCO superconducting grains nucleate.e.

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The Formation of $YBa_2Cu_3O_{7-x}$(Y123) and CuO Phases in Cu-sheath YBCO Thick Films (동피복 YBCO 후막에서 $YBa_2Cu_3O_{7-x}$(Y123) 및 CuO상의 형성 기구)

  • Kim K.J.;Han S. C.;Han Y. H.;Jeong N. H.;Yun H. J.;Oh J. M.;Choi H. R.;Sung T. H.
    • Progress in Superconductivity
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    • v.6 no.2
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    • pp.129-132
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    • 2005

  • The formation behavior of $YBa_2Cu_3O_{7-x}$(Y123) and CuO phases in the heat-treated Cu-sheathed YBCO thick films was studied. The thick films were prepared by screen-printing method using $BaCO_3$ and Y211 powders on Cu tapes. The screen-printed thick films were placed at the center of the tube furnace, heated to $930^{\circ}C$ in air atmosphere and then maintained at the temperature for 60 sec - 300 sec. The microstructure and phases formed in the thick films were investigated by using optical microscope, X-ray diffraction (XRD) and SEM image analysis. During the heat treatment, partial melting occurred rapidly in the printed layers by peritectic reaction between CuO and precursor powders, and then YBCO superconducting phases nucleated from the Cu tapes and grew in a form of thick films.

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