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  1. No Access

    Article

    Processing Parameters that Affect the Tolerable Bending Diameter of Reacted MgB2 Wires

    In this study, tolerable bending diameters of reacted MgB2 wires fabricated to produce varying outer sheath materials, numbers of MgB2 filaments, and sheath layer thickness were investigated. The result showed th...

    Byeongha Yoo, Young-Gyun Kim, Jiman Kim, Sehoon Jang… in Metals and Materials International (2019)

  2. No Access

    Article

    Thermal and electrical properties of thermal-grease-insulated REBCO superconducting coils with respect to winding tension

    This study investigates the thermal and electrical characteristics of a silicon-based grease insulation (GI) GdBCO coil with respect to the winding tension through charge, sudden discharge, and over-current te...

    Jung-Bin Song, Yoon Hyuck Choi, Dong Gyu Yang… in Metals and Materials International (2017)

  3. No Access

    Article

    Fabrication and testing of high performance acoustic emission sensor with Ta-Doped lead zirconate titanate

    The piezoelectric and dielectric properties of ceramics containing Pb(Zr0.54Ti0.46) O3 + 0.2 wt.% Cr2O3 + x wt.% Ta2O5, where x = 0.0 to 5.0, were investigated for the development of a high performance acoustic e...

    Dong-Hyung Kang, Kwang Lok Kim, Dong Gyu Yang… in Journal of Electroceramics (2015)

  4. No Access

    Article

    Analysis of the Mechanical Characteristics of a 17-MW-Class High-Temperature Superconducting Synchronous Motor

    This paper presents an analysis of the mechanical characteristics of a 17-MW-class high-temperature superconducting (HTS) synchronous motor. The fundamental electromagnetic, structural, and thermal design must...

    Ji Hyung Kim, Sail Park, Thanh Dung Le… in Journal of Superconductivity and Novel Mag… (2015)

  5. Article

    Open Access

    A superconducting joint for GdBa2Cu3O7−δ-coated conductors

    Second-generation (2G) GdBCO-coated conductors (CCs) are promising for superconducting magnet applications because of their high critical current (Ic) density, low dependency of the Ic on the external magnetic fi...

    Yeonjoo Park, Myungwhon Lee, Heesung Ann, Yoon Hyuck Choi, Haigun Lee in NPG Asia Materials (2014)

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  6. No Access

    Article

    Fabrication of a high performance acoustic emission (AE) sensor to monitor and diagnose disturbances in HTS tapes and magnet systems

    An acoustic emission (AE) technique was introduced as a non-destructive method to monitor sudden deformation caused by local heat concentrations and micro-cracks within superconductors and superconducting magn...

    Ju-Hyung Kim, Jung-Bin Song, Young Hun Jeong… in Metals and Materials International (2010)

  7. No Access

    Article

    Oxygen out-diffusion in partially melted YBa2Cu3Oy−0.325Ag superconductor at reduced oxygen partial pressure

    In this study, we examined the chemical diffusion coefficient of oxygen out-diffusion( \(\tilde D_{out} \) ) in partially melte...

    Ju-Hyung Kim, Haigun Lee in Metals and Materials International (2008)

  8. No Access

    Article

    Synthesis of YBa2Cu3Oy superconductors via attrition-milled intermediate oxide precursor containing BaCuO2.5

    YBa2Cu3Oy (Y123) phase was synthesized from the oxide precursor containing BaCuO2.5 in two distinct processes. in the first stage, a suitable amount of metallic Y, metallic Cu and barium nitrate (Ba(NO3)2) were m...

    Haiwoong Park, Haigun Lee in Metals and Materials International (2001)

  9. No Access

    Article

    Synthesis of yttrium barium copper oxide-0.325Ag superconductors via intermediate precursor with overall composition Y:Ba:Cu:0=l:2:3:Y, Y>7 produced by high-energy attrition milling

    A highly homogeneous composite precursor containing nano-scale particles was synthesized from the highenergy attrition milling of a mixture of metallic Y, metallic Cu and barium nitrate (Ba(N03)2) containing 5 wt...

    Haigun Lee, Haiwoong Park, Dokyol Lee in Metals and Materials (2000)