Electrical and Superconducting Properties in Lap Joints for YBCO Tapes

Baldan, C.A.; Oliveira, U.R.; Bernardes, A. A.; Oliveira, V.P.; Shigue, C.Y.; Ruppert, Ernesto

doi:10.1007/s10948-012-1905-6

Cited by 25 publications

(6 citation statements)

References 10 publications

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“…The electromechanical splice properties are important for applications where the splices are submitted to substantial mechanical loads. The influence of tensile loading on the electrical resistance of REBCO splices at 77 K has already been 2 reported in [9,10,11]. Here we present results that show the influence of transverse compressive stress on the resistance of REBCO tape lap splices.…”

Section: Introductionsupporting

confidence: 81%

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Grether

Bottura

Scheuerlein

et al. 2016

Supercond. Sci. Technol.

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Abstract.We have studied the influence of transverse compressive stress on the resistance and critical current (I c ) of soldered REBCO tape lap splices. Internal contact resistances dominate the overall REBCO lap splice resistances. Application of transverse compressive stress up to 250 MPa during the resistance measurements does not alter the resistance and I c of the soldered REBCO splices that were studied. The resistance of unsoldered REBCO tape lap splices depends strongly on the contact pressure. At a transverse compressive stress of 100 MPa to which Roebel cables are typically exposed in high field magnets, the crossover splice contact resistance is comparable to the internal tape resistances.

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Section: Introductionsupporting

confidence: 81%

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Grether

Bottura

Scheuerlein

et al. 2016

Supercond. Sci. Technol.

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“…As a result, REBCO conductors are of significant interest for a range of superconducting magnet applications, including colliders, nuclear magnetic resonance, motors, generators, and energy storage [5,6]. Conductors in magnet applications are subjected to a variety of mechanical and thermal loads, including those due to the manufacturing process, differential thermal contraction, Lorentz forces during operation, and in some applications fatigue [2,[6][7][8][9][10][11][12][13][14]. Thus, fully understanding the electro-mechanical properties of REBCO conductors is key to successful systems development and operation.…”

Section: Introductionmentioning

confidence: 99%

Effects of room-temperature tensile fatigue on critical current andn-value of IBAD–MOCVD YBa₂Cu₃O_7−x/Hastelloy coated conductor

Rogers

Chan

Schwartz

2016

Supercond. Sci. Technol.

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Vapor Deposition (IBAD-MOCVD) REBCO conductors on Hastelloy substrates is reported for axial tensile strains up to 0.5% and up to 100,000 cycles. Failure mechanisms are investigated via microstructural studies. Results show that REBCO conductors retain electrical performance for 10,000 cycles at ε=0.35% and ε=0.45% strain, and ε=0.5% for 100 cycles. The main cause of fatigue degradation in REBCO conductors is crack propagation that initiates at the slitting defects that result from the manufacturing process.

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“…They experimented with different joint geometries and surface preparation processes, with and without application of pressure during the soldering process. In their follow-up study [ 14 ], they also investigated the mechanical properties of joints (tensile stress); similar measurements were published by [ 11 ], in which they found that etching out the SCT Cu stabilizer reduced both the R j. A j and I c degradation upon axial load.…”

Section: Introductionmentioning

confidence: 87%

Thermal Cycling of (RE)BCO-Based Superconducting Tapes Joined by Lead-Free Solders

et al. 2021

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We prepared overlap soldered joints of high-temperature superconducting tapes, using various materials and preparation conditions. In order to select the joints with optimal performance, we correlated their electrical properties (derived from current–voltage curves) with the microstructure of the respective joint cross-section by scanning electron microscopy. With the first group of joints, we focused on the effect of used materials on joint resistivity and critical current, and we found that the dominant role was played by the quality of the internal interfaces of the superconducting tape. Initial joint resistivities ranged in the first group from 41 to 341 nΩ·cm2. The second group of joints underwent a series of thermal cyclings, upon which the initial resistivity range of 35‒49 nΩ·cm2 broadened to 25‒128 nΩ·cm2. After the total of 135 thermal cycles, three out of four joints showed no signs of significant degradation. Within the limit of 100 thermal cycles, reliable soldered joints can be thus prepared, with normalized resistivity not exceeding 1.4 and with normalized critical current above the value of 0.85.

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Electrical and Superconducting Properties in Lap Joints for YBCO Tapes

Cited by 25 publications

References 10 publications

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Effects of room-temperature tensile fatigue on critical current andn-value of IBAD–MOCVD YBa₂Cu₃O_7−x/Hastelloy coated conductor

Thermal Cycling of (RE)BCO-Based Superconducting Tapes Joined by Lead-Free Solders

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Electrical and Superconducting Properties in Lap Joints for YBCO Tapes

Cited by 25 publications

References 10 publications

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Effects of room-temperature tensile fatigue on critical current andn-value of IBAD–MOCVD YBa2Cu3O7−x/Hastelloy coated conductor

Thermal Cycling of (RE)BCO-Based Superconducting Tapes Joined by Lead-Free Solders

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Effects of room-temperature tensile fatigue on critical current andn-value of IBAD–MOCVD YBa₂Cu₃O_7−x/Hastelloy coated conductor