Influence of superconductor film composition on adhesion strength of coated conductors

Kesgin, Ibrahim; Khatri, N D; Wang, Kun; Delgado, Louis; Galstyan, Eduard; Selvamanickam, V.

doi:10.1088/0953-2048/29/1/015003

Cited by 33 publications

(19 citation statements)

References 24 publications

(42 reference statements)

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“…The whole construction of the CC can be regarded as a mechanical structure consisting of ceramic and metal layers attached together. As a result, the bonding strength of the CC in the transverse direction is mainly determined by the cohesive bonding strength in the matrix of each ceramic layer itself and adhesive strength between the interfaces [10].…”

Section: Introductionmentioning

confidence: 99%

National round robin test (RRT) for delamination strength testing YBCO HTS wires at room temperature (RT) and 77K

et al. 2023

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Second generation high temperature superconducting coated conductors (2G HTS CCs) have becoming indispensable wires for high-field superconducting magnets. The transverse mechanical delamination strength (MDS) is a key parameter due to the multilayered structure of CCs. Determination of the MDS value is thus significant. In this study, we report the MDS results of national round robin tests in china, which were conducted by the institutions of Lanzhou University, Institute of Plasma Physic, and Shanghai Superconductor Technology Co., Ltd by a standardized procedure for determining the transverse MDS of 2G HTS CCs (copper-stabilized) at room temperature (RT) and 77K, respectively. Data at RT and 77K all showed good consistency, with ratios of standard uncertainty to the average of 2.22% and 2.35%, respectively, illustrating the reliability of the established procedure, which can be used as a reference for engineering CC manufacturing and magnet design of applications.

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Section: Introductionmentioning

confidence: 99%

National round robin test (RRT) for delamination strength testing YBCO HTS wires at room temperature (RT) and 77K

et al. 2023

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“…Once the transverse stress on the CC tape is greater than its interfacial delamination strength, severe degradation occurs irreversibly. Some testing methods have been used to investigate the delamination behaviour of REBCO CC tapes, including the anvil and pin-pull transverse tensile tests [21][22][23][24][25][26][27], peel tests [28,29], cleavage tests [30], and anvil shear tests [31]. Among them, the anvil and pin-pull transverse tensile tests are widely used to determine the transverse tensile delamination strength.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Transverse Tensile Interfacial Strength of REBCO-Coated Conductors

Gao

Geng

Zhang

et al. 2021

Acta Mech. Solida Sin.

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We present a new test method for the accurate measurement of the transverse tensile interfacial strength of rare-earth barium copper oxide (REBCO)-coated conductor (CC) tapes to overcome heavy scattering of data tested using regular test methods. A new composite structure specimen is designed and constructed by solidifying a standard epoxy resin tensile specimen using the three-dimensional printing technology, where a short REBCO CC tape is embedded. The feasibility of the proposed test method is numerically validated through finite element (FE) calculations. Experimental results show that the valid delaminated strength is 2.19-2.51 MPa with the maximum relative error of 7.3%, indicating the elimination of significant scattering in the tested data. By analysing the morphology of the delaminated interfaces and energy-dispersive spectroscopy results, it is discovered that delamination primarily occurs at the interface between the REBCO superconducting layer and the buffer layer and that a small portion of the REBCO and buffer layers peels off. Further error analysis based on the FE method indicates that the tape is more likely to delaminate because of initial defects, whereas the adhesion at the edges of the CC tape due to the redundancy of the epoxy resin increases the resistance of the CC tape to delamination, resulting in a higher testing value than the real one.

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“…Kesgin et al used the T peel test to delaminate CC samples, and the delamination force and surface topography were measured. It was concluded that the delamination could occur between the HTS layer and buffer layer or inside the HTS layer [15].…”

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confidence: 99%

“…First, the direct delamination by peeling force could cause micro-cracks in the YBCO layer, which might be caused by the local curve which exceeded the radius limitation of CC [19]. Second, the YBCO layer near the edges was difficult to delaminate, because the adhesion strength was larger there [15]. Therefore, the delamination operation was conducted at room temperature as following: Both edges of the original sample were sheared, with the CC width decreasing to 3.63 mm; The sheared sample were placed in liquid nitrogen, and could delaminate by itself, similar to the report of Takematsu et al [7].…”

mentioning

confidence: 99%

Critical current survival in the YBCO superconducting layer of a delaminated coated conductor

Feng¹,

Fu²,

Qu³

et al. 2018

Supercond. Sci. Technol.

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High temperature superconducting coated conductor (CC) could be practically applied in electric equipment due to its favorable mechanical properties and the critical current performance of YBCO superconducting layer. It is well known that CC could be easily delaminated because of its poor stress tolerance in thickness direction, i.e. along the c-axis of YBCO. Commonly, a stack including YBCO layer and silver stabilizer could be obtained after the delamination. It would be interesting to investigate the superconducting properties of the delaminated stack, since it could also be considered as a new type of CC with the silver stabilizer as the buffer layer, which is quite different from the oxide buffer layers in the traditional CC and might lead to new applications. In this study, a CC sample was delaminated by liquid nitrogen immersing. A Hall probe scanning system was employed to measure the critical current (IC) distribution of the original sample and the obtained stack. It was found that IC could be partially preserved after the delamination. Dense and crack-free morphologies of the delaminated surfaces were observed by scanning electron microscopy, and the potential application of the obtained stack in superconducting joint technology was discussed.

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Influence of superconductor film composition on adhesion strength of coated conductors

Cited by 33 publications

References 24 publications

National round robin test (RRT) for delamination strength testing YBCO HTS wires at room temperature (RT) and 77K

National round robin test (RRT) for delamination strength testing YBCO HTS wires at room temperature (RT) and 77K

Measurement of Transverse Tensile Interfacial Strength of REBCO-Coated Conductors

Critical current survival in the YBCO superconducting layer of a delaminated coated conductor

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