Progress in research and development for REBCO coated conductors by reactive co-evaporation

Oh, Seungtae; Kim, H.S.; Ha, H.S.; Ko, Rock-Kil; Ha, Dong Woo; Lee, H.; Moon, S.H.; Yoo, Sang‐Im

doi:10.9714/psac.2013.15.4.001

Cited by 16 publications

(9 citation statements)

References 18 publications

(19 reference statements)

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“…Afterward, a 3 μm thick layer of GdBCO HTS was grown on top of the MgO via electron beam evaporation from a granulate. 33 , 36 The CC used was not silver coated.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The CC architecture consists of a 100 μm thick electropolished Hastelloy substrate, on which a 3 μm thick texturized layer of MgO was evaporated using an inclined deposition technique (ISD), , and a second 450 nm thick coating of MgO was deposited at a perpendicular angle. Afterward, a 3 μm thick layer of GdBCO HTS was grown on top of the MgO via electron beam evaporation from a granulate. , The CC used was not silver coated.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa₂Cu₃O_7−δ Coated Conductors

et al. 2022

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The primary benefit of a metallic stabilization/shunt in high temperature superconductor (HTS) coated conductors (CCs) is to prevent joule heating damage by providing an alternative path for the current flow during the HTS normal state transition (i.e., quench). However, the shunt presence in combination with unavoidable fluctuations in the critical current ( I c ) of the HTS film can develop a localized quench along the CC’s length if the operational current is kept close to I c . This scenario, also known as the hot-spot regime, can lead to the rupture of the CC if the local quench does not propagate fast enough. The current flow diverter (CFD) is the CC architecture concept that has proven to increase the conductor’s robustness against a hot-spot regime by simply boosting the quench velocity in the CC, which avoids the shunt compromise in some applications. This work investigates a practical manufacturing route for incorporating the CFD architecture in a reel-to-reel system via the preparation of yttrium oxide (Y 2 O 3 ) as an insulating thin nanolayer (∼100 nm) on top of a GdBa 2 Cu 3 O 7 (GdBCO) superconductor. Chemical solution deposition (CSD) using ink jet printing (IJP) is shown to be a suitable manufacturing approach. Two sequences of the experimental steps have been investigated, where oxygenation of the GdBCO layer is performed after or before the solution deposition and the Y 2 O 3 nanolayer thermal treatment formation step. A correlated analysis of the microstructure, in situ oxygenation kinetics, and superconducting properties of the Ag/Y 2 O 3 /GdBCO trilayer processed under different conditions shows that a new customized functional CC can be prepared. The successful achievement of the CFD effect in the case of the preoxygenated customized CC was confirmed by measuring the current transfer length, thus demonstrating the effectiveness of the CSD-IJP as a processing method.

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“…Afterward, a 3 μm thick layer of GdBCO HTS was grown on top of the MgO via electron beam evaporation from a granulate. 33 , 36 The CC used was not silver coated.…”

Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa₂Cu₃O_7−δ Coated Conductors

et al. 2022

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“…Following this achievement, Table 1 lists many CC companies that use IBAD-MgO. SuNAM in Korea is a leader in IBAD-MgO elaboration for their ultra-fast growth of long HTS CCs [9]. Originally, the method was implemented in the Korea Electrotechnology Research Institute (KERI) where researchers are recently developed solution deposition polishing (SDP) independently of LANL [10].…”

Section: Historical Reviewmentioning

confidence: 99%

IBAD-MgO technology for coated conductors

Jo¹

2016

Progress in Superconductivity and Cryogenics

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Ion-beam assisted deposition (IBAD) technology has been successfully applied to high-temperature superconductor coated conductors (CC) as textured substrates. Since the coated conductors were proposed as a potential framework for utilizing the superior transport characteristics of YBa 2 Cu 3 O 7 and related cuprate oxides, several methods including rolling-assisted bi-axial textured substrates (RABiTS) and inclined substrate deposition (ISD), as well as IBAD, have been attempted. As of 2016, most companies that are trying to commercialize CC adapt IBAD technology except for American Superconductors who use RABiTS predominantly. For the materials in the IBAD process, initial efforts to use yttria-stabilized zirconia (YSZ) or related fluorites in Fujikura in Japan have quickly given way to MgO which technique was developed by Stanford University in the USA. In this review, we present a historical overview of IBAD technology, in particular, for the application of CC. We describe the key scientific understanding of nucleation, the texturing mechanism, and the growth of large bi-axial grains and discuss some potential new IBAD materials and systems for large-scale production.

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“…Since the discovery of high-transition temperature (high-T c ) Cu-oxide superconductor [1], various kinds of Cu-oxide superconductors have been discovered [2][3][4][5]. Among them, REBa 2 Cu 3 O 7-δ (RE123, RE: rare earth) in a thin-film form is a promising material for high-field superconductivity application because of its high-T c exceeding 90 K and high critical current density (J c ) under magnetic fields [6]. To improve J c of RE123 films, nanoscale disorders such as nanoparticles, nanocomposite structure, defects etc.…”

Section: Introductionmentioning

confidence: 99%

Improvement of critical current density of RE Ba ₂ Cu ₃ O _7-δ by increase in configurational entropy of mixing

2022

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RE Ba 2 Cu 3 O 7- δ ( RE 123, RE : rare earth) is one of the high-temperature superconductors with a transition temperature ( T c ) exceeding 90 K. Because of its high- T c and large critical current density ( J c ) under magnetic fields, RE 123 superconductors have been expected to play a key role in superconductivity application. To accelerate application researches on RE 123-based devices, further improvements of J c characteristics have been desired. In this study, we investigated the effects of high-entropy alloying at the RE site on the superconducting properties, through the measurements of local (intra-grain) J c ( J c local ) by a remanent magnetization method. We found that J c local shows a trend to be improved when four or five RE elements are mixed at the RE site, which results in high configurational entropy of mixing (Δ S mix ). All samples exhibited an order of few MA cm −2 which is a criterion for practical application and the highest J c local resulted in a value of around 7.0 MA cm −2 at T = 2.0 K. Because high-entropy alloying can improve J c local of RE 123 superconductors, our entropy-engineering strategy introduced here would be useful for the development of RE 123 superconducting materials available under high magnetic fields.

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Progress in research and development for REBCO coated conductors by reactive co-evaporation

Cited by 16 publications

References 18 publications

Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa₂Cu₃O_7−δ Coated Conductors

Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa₂Cu₃O_7−δ Coated Conductors

IBAD-MgO technology for coated conductors

Improvement of critical current density of RE Ba ₂ Cu ₃ O _7-δ by increase in configurational entropy of mixing

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Progress in research and development for REBCO coated conductors by reactive co-evaporation

Cited by 16 publications

References 18 publications

Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa2Cu3O7−δ Coated Conductors

Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa2Cu3O7−δ Coated Conductors

IBAD-MgO technology for coated conductors

Improvement of critical current density of RE Ba 2 Cu 3 O 7-δ by increase in configurational entropy of mixing

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Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa₂Cu₃O_7−δ Coated Conductors

Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa₂Cu₃O_7−δ Coated Conductors

Improvement of critical current density of RE Ba ₂ Cu ₃ O _7-δ by increase in configurational entropy of mixing