The electromagnetic properties of YGdBCO coated conductors with periodic micro-holes arrays

Wang, M.J.; Wang, W.T.; Liu, L.; Tian, Z; Zhao, Yong

doi:10.1016/j.jallcom.2021.160138

Cited by 9 publications

(2 citation statements)

References 32 publications

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“…second-generation high-temperature superconducting tapes, have attracted much attention in a wide variety of potential applications [1][2][3][4], typically represented by superconducting magnets, power transmission cables and electronic devices. This is due to their high current densities and excellent mechanical behavior [5][6][7]. As the uppermost engineering application of REBCO tapes, superconducting magnets have special requirements for tape length, magnetic field shape, field intensity and current operation mode, which make joint fabrication a key technical link during the development of magnets.…”

Section: Introductionmentioning

confidence: 99%

Low-resistance joints for YBCO-coated conductors with Ag nanoparticle paste

Wentao

Ming

Han

et al. 2023

Supercond. Sci. Technol.

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Due to the limited available piece length of YBCO coated conductors (i.e., tapes or wires) and the different requirements for magnetic field, joint is inevitable for manufacturing high temperature superconducting magnets. In this work, a sintering nano silver process was developed and used to connect YBCO tapes stabilized by silver layer by low temperature and short time sintering of Ag nanoparticle paste. The thermodynamic characteristics of Ag nanoparticle paste were explored by a TG/DSC setup. The effect of sintering temperature, mechanical pressure and lapped length on microstructures and electrical properties of joint were comprehensively investigated. It is found that the pre-volatilization of low boiling point solvent in the paste is beneficial to improve the densification of sintered structure, thus contribute to increasing the critical current Ic of joint. With increasing the sintering temperature, Ic of joint is close to that of the virgin tape and joint resistance experiences a small fluctuation, but joint connectivity is enhanced. As the temperature reaches 205℃, Ic decreases to 84% of the virgin tape and joint resistance increases obviously. In addition, axial tension strength at room temperature has been improved with the increase of mechanical pressure, while the resistance has not demonstrated distinct variation. Considering electromechanical properties, the optimal joining process is determined as sintering at 180℃ and 30 MPa for 10 min. The joint by this technology possesses closely connected interface and well sintered nano silver microstructure with pores. By further extending lapped length, YBCO joint resistivity as low as ~10.56 nΩ.cm2 has been obtained, which is around a quarter of that of soldering joint, and the process is much easier than that of silver diffusion joint.

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Section: Introductionmentioning

confidence: 99%

Low-resistance joints for YBCO-coated conductors with Ag nanoparticle paste

Wentao

Ming

Han

et al. 2023

Supercond. Sci. Technol.

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“…The second-generation high-temperature superconducting (2G-HTS) tapes are considered one of the most promising practical superconductors due to their high transition temperature, high critical current density, and excellent mechanical properties [1][2][3][4][5][6][7]. The 2G-HTS tapes have a multi-layer structure, which includes a metallic substrate, ceramic buffer layers, a ceramic superconducting layer, and metallic stabilizers.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of electro-mechanical behaviors in RE–Ba–Cu–O composite superconducting tapes with laser slit edges

Guo

Chen²,

liu³

et al. 2022

Supercond. Sci. Technol.

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The slit technique is an essential process for narrowing the second-generation high-temperature superconducting tapes (2G-HTS). It is still very challenging to eliminate edge defects introduced during slitting. In this work, we developed a set of reel-to-reel laser slit equipment for narrowing 2G-HTS tapes using a femtosecond infrared laser. In comparison with the commonly used mechanical slit (MS) technique, the laser slit (LS) technique produced no cracks at the tape edges. Electro-mechanical behaviors of 2G-HTS tapes with MS and LS edges were compared in liquid nitrogen conditions. The results of the uniaxial tensile tests showed only a minor difference in irreversible tensile stress/strain of the two kinds of tapes. However, uniaxial tensile fatigue tests showed that the critical current (Ic) retention of the LS tapes was about 14% higher than that of the MS tapes after 104 cycles (@ 77 K, σmax = 0.8σy, and a stress ratio of 0.1). Moreover, U-Spring compressive tests revealed that no irreversible Ic degradation occurred on the LS tapes under compressive strain up to -0.8%, with high reproducibility. On the contrary, the irreversible compressive strains of the MS tapes were rather scattered, ranging from -0.75% to -0.2%. Enhancement of electro-mechanical behaviors is strongly linked to fewer edge defects in the LS tapes. This research demonstrates significant advantages of the laser slit technique over the conventional mechanical slit technique, showing its promising prospects for demanding applications.

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Influence of the wire diameter, filament size and interval Ag space on the processing window of Bi-2212 wires

Liu

Yao

et al. 2023

J Mater Sci: Mater Electron

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The electromagnetic properties of YGdBCO coated conductors with periodic micro-holes arrays

Cited by 9 publications

References 32 publications

Low-resistance joints for YBCO-coated conductors with Ag nanoparticle paste

Low-resistance joints for YBCO-coated conductors with Ag nanoparticle paste

Enhancement of electro-mechanical behaviors in RE–Ba–Cu–O composite superconducting tapes with laser slit edges

Influence of the wire diameter, filament size and interval Ag space on the processing window of Bi-2212 wires

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