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김동주,박정철,채기병,강기성,소대화,코로보바 明知大學校 産業技術硏究所 2000 産業技術硏究所論文集 Vol.19 No.-
In this paper, the preparation of BSCCO superconducting wire by electrophoretic deposition method and the effect of suspension medium used with various solvent solutions of acetone ethanol. toluene and buthanol for electrophoretic deposition were studied. The preheating technique in vacuum system for the superconducting powders coated on Ag wire was also investigated. As a result, it was confirmed that the preheating technique was very useful to remove the influence of remains affected to the surface condition of superconducting wire. And the adsorbed solvent solution which was existed between and on the deposited particle surfaces was almost disappeared at the treating conditions of about 10-³ Torr and around 200℃ in bell-jar system. By measurement of 4-point prove method, the critical current density(Je) of BSCCO superconducting wire was obtained at the value of more than 10⁴A/㎠ in liquid N₂(77K, OT).
소대화,전용우,이영매,임병제,Korobova, Natalya 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
YBCO superconducting thick films were perpared on Ag wire by electrophoresis in acetone and ethanol with chemically modified suspension. The addition of organic compounds, such a PEG into suspension solution for improving critical current density was investigated. Surfac state, deposition conditions, pore distribution and cracks were investigated by using SEM photographs. Controlling preparation conditions were studied for reducing these defects. As a results, in acetone slolution, the surface crack of samples was decreased with increasing PEG. To develop optimum microstructures for samples processes affect the microstructure and hence the properties of ceramic superconductors.
소대화,박정철,이영매,조용준,Korobova, Natalya 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
For the research of the effects on suspension solution with YBcO and BSCCO for elcectrophoretic deposition to prepare superconducting thick film wire, the preheating technique for the superconducting powders in vaccum system was used with various solvent solutions for electrophoresis such as acetone, toluen and buthanol was investigated. As a result, it was useful to remove the influence of remaining and adsorbed solvent solution which was existed between and on the particle surfaces when the specimens of superconducting wire by electrophoresis were treated in vacuum of 10-3 Torr and temperature around 200℃ in bell-jar system. Of the prepared superconducting wire samples, the critical current density, Jc was measured by 4-point prove method in liquid N₂, and at the value of 10³to 10⁴A/㎠, respectively, for the YBCO and BSCCO superconducting wires.
소대화,코로보바 나탈리아,조용준,이영매 明知大學校 産業技術硏究所 2002 産業技術硏究所論文集 Vol.21 No.-
High-Tc superconductor films of YBa2Cu3O7-x were fabricated by electrophoretic deposition (EPD) from alcohol-based suspension, It is very important to select suspension solution for forming electrophoretic deposited YBCO thick film, because it is heavily affected to its superconducting properties. For the formation of YBCO dense and adherent coating on a silver wire by EPD, 1% PEG(1000) 2㎖, as a additive for making their surface crack-free, was used for electrophoresis. In this paper, high-temperature superconductor films of YBa2Cu3O7-x were fabricated by electrophoretic deposition (EPD) from alcohol-based suspension such as iso-propanol, iso-butanol, and their mixture. As a results, the cracks were considerably decreased and the superconducting critical current density (Jc) without/with PEG was 1200 A/㎠ and 2020 A/㎠, which films deposited in 30% iso-PrOH and 70 % iso-BuOH suspensionin mix iso-propanol and iso-butanol suspension.
액상-고상반응법과 자기전파고온합성법에 의한 YBCO 초전도체의 특성
蘇大和,코로보바 나탈리아,金泰完 明知大學校 産業技術硏究所 2002 産業技術硏究所論文集 Vol.21 No.-
In this paper, instead of YBCO superconductor that used Solid State Reaction method, we propose the construction method using Liquid-Solid State Reaction and Self-propagating High-temperature Synthesis(SHS) method. We developed the SHS method using BaO2 and the liquid-solid state reaction method using BaO, rather than BaCO3, which using YBCO superconductor in solid state reaction method. YBCO superconductor, which was produced through presented method in the above section, using wish the XRD, we can be observed superconductor phase and inspected the superconductivity with producing wire deposition through exectrophoretic deposited, measuring critical temperature and critical current. After measurement of experiment, liquid-solid state reaction and SHS method can be proved excellent 123 phase, critical temperature, which is 92 K and 90 K can be proved better than solid state reaction method's 86 K. Critical current measured by four-probe method can be acquired 0.65 A in solid state reaction, 0.76 A in liquid-solid state reaction, and 0.73 A in SHS method. Each critical current density can be acquired 830 A/㎠, 970 A/㎠, 930 A/㎠(77 K, 0 T) by calculation.
Fast Preparation of BSCCO Superconductor by Self-propagation High-temperature Synthesis
Soh, Deawha,Cho, Yongjoon,Park, Seongbeom,Soh, Hyunjoon,Korobova, N. 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-
Abstract - The BSCCO superconductor materials of using Self-propagating High-temperature Synthesis (SHS) were studied. Mechano-chemical activation - as a pretreatment of the reactants mixture - strongly influences the kinetic parameters, the reaction mechanism, and the composition and structure of the final product. In this paper as an effort for fabricating the SHSed BSCCO superconductor power by SHS method was considered to application in the synthesis of high temperature superconducting materials.