Processing of Long-Length YBCO Coated Conductors Based on Stainless Steel Tapes

Usoskin, A.; Kirchhoff, L..; Knoke, J.; Prause, Burkhard A.; Rutt, A.; Selskij, V..; Farrell, D. E.

doi:10.1109/tasc.2007.900041

Cited by 64 publications

(36 citation statements)

References 7 publications

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“…Pulsed laser deposition (PLD). The PLD process, widely used in the development of the CC technology, has been recently optimized by various manufacturers (Bruker, Fujikura, SuperOx and Sumitomo) and scaled up to production lengths [11,16,20,21,26]. A pulsed ultraviolet laser, typically an excimer laser from KrF or XeCl, irradiated a sintered target with the desired composition to form a superconducting layer.…”

Section: Metal Organic Chemical Vapor Deposition (Mocvd)mentioning

confidence: 99%

Progresses and challenges in the development of high-field solenoidal magnets based on RE123 coated conductors

Senatore

Alessandrini

Lucarelli

et al. 2014

Supercond. Sci. Technol.

255

136

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Recent progresses in the second generation REBa 2 Cu 3 O 7 − x (RE123) coated conductor (CC) have paved a way for the development of superconducting solenoids capable of generating fields well above 23.5 T, i.e. the limit of NbTi−Nb 3 Sn-based magnets. However, the RE123 magnet still poses several fundamental and engineering challenges. In this work we review the state-ofthe-art of conductor and magnet technologies. The goal is to illustrate a close synergetic relationship between evolution of high-field magnets and advancement in superconductor technology. The paper is organized in three parts: (1) the basics of RE123 CC fabrication technique, including latest developments to improve conductor performance and production throughput; (2) critical issues and innovative design concepts for the RE123-based magnet; and (3) an overview of noteworthy ongoing magnet projects.

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Section: Metal Organic Chemical Vapor Deposition (Mocvd)mentioning

confidence: 99%

Progresses and challenges in the development of high-field solenoidal magnets based on RE123 coated conductors

Senatore

Alessandrini

Lucarelli

et al. 2014

Supercond. Sci. Technol.

255

136

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“…Throughout this research, SDP-Y 2 O 3 samples were deposited using the piezoelectric inkjet printing methodology [6,7] on top of unpolished stainless steel (SS) from Bruker (Alzenau, Germany) [42] previously wiped out with ethanol (99.8%, Sigma Aldrich, Saint Louis, MO, USA). In particular, inkjet printing was carried out using two kinds of printing set-ups: a batch printer and a roll to roll (R2R) inkjet printing continuous system.…”

Section: Metal-organic Precursor Ink Depositionmentioning

confidence: 99%

“…The printing parameters used in this work to deposit SDP-Y 2 O 3 layers on top of unpolished stainless steel (SS) substrate from Bruker [42] are listed in Table 2 and graphically displayed in Figure 2. SDP-Y 2 O 3 films of about 100 nm were prepared at tape speeds between 20 m/h and 44.5 m/h and pyrolyzed at 500 • C in air with the batch printer system.…”

Section: Inkjet Printing Deposition Of Short-length Sdp-y 2 O 3 Filmsmentioning

confidence: 99%

Inkjet-Printed Chemical Solution Y2O3 Layers for Planarization of Technical Substrates

Vilardell¹,

Fornell

Sort

et al. 2017

Coatings

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Abstract:The implementation of the Chemical Solution Deposition (CSD) methodology with the Drop on Demand (DoD) inkjet printing (IJP) technology has been successfully employed to develop a Solution Deposition Planarization (SDP) method. We have used nanocrystalline yttrium oxide (Y 2 O 3 ) to decrease the roughness of technical metallic substrates by filling the surface imperfections and thus avoiding costly polishing steps. This alternative process represents an outstanding methodology to reduce the final cost of the second-generation coated conductors manufacturing. Two Y 2 O 3 metalorganic precursor ink formulations were successfully developed and tested to obtain surfaces as smooth as possible with adequate mechanical properties to hold the internal stress developed during the growth of the subsequent layers. By using these inks as precursors for IJP and after a proper tuning of the rheological and wetting parameters, we firstly obtained centimeter length uniform 100 nm-thick SDP-Y 2 O 3 films on unpolished stainless-steel substrate from Bruker HTS. The scalability of the roll to roll (R2R)-IJP process to 100 m is then demonstrated on metallic substrates as well. A complete characterization of the prepared SDP-Y 2 O 3 inkjet-printed layers was carried out using optical microscopy, FIB-SEM (Focus Ion Beam coupled to Scanning Electron Microscopy), XRD (X-ray Diffraction), AFM (Atomic Force Microscopy), reflectometry and nanoindentation techniques. Then, the morphology, thickness, crystallinity and mechanical properties were evaluated, together with the surface roughness in order to assess the resulting layer planarity. The impact of planarity was additionally studied via growth of biaxially textured buffer layers as well as further functional layers. 1.1 µm-thick YSZ layers with in-plane textures better than the stainless steel (SS) polished reference were successfully deposited on top of 100 nm SDP-Y 2 O 3 films yielding 50% of I c in contrast to the standard SS reference.

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“…In recent years high temperature superconducting (HTS) coated conductors (CC) have become available not only in short pieces but also in long lengths [1][2][3]. Simultaneously, a variety of applications is under investigation each with different requirements regarding the HTS-CC tape and its structure.…”

Section: Introductionmentioning

confidence: 99%

“…For high current applications like SC-magnets and for electrical power applications, e.g. transformers, motors and cables a highly conductive metal stabilization layer is common practice in addition to the caplayer on top of the YBCO HTS film [1][2][3] current is redistributed into the normal metal part of the conductor. There, a highly conductive material e.g.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of High Temperature Superconductor Coated Conductors

Schwarz¹,

Schacherer²,

Ehrlich³

et al. 2010

AIP Conference Proceedings

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High temperature superconductor coated conductors become more and more applicable, e.g. in transformers, power transmission lines or magnets. However, the question of electrical and thermal stability is still an important one. Thermal instabilities during operation can destroy the conductor. This can be prevented by adding a stabilizing metal layer improving the thermal conductivity of the conductor. Of course the thermal conductivity depends not only on the purity of the components but also on the manufacturing process of the composite tape, which alter the purity of the starting materials significantly. Consequently the thermal conductivity has to be measured. In this investigation superconducting tapes from different manufacturers are examined with the axial-heat-flow method. The measurement provides a quality rating of the stabilizing metal layer. The results allow for finite element analysis to predict the behaviour of the superconductor under thermal disturbances or at transient operating states.

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Processing of Long-Length YBCO Coated Conductors Based on Stainless Steel Tapes

Cited by 64 publications

References 7 publications

Progresses and challenges in the development of high-field solenoidal magnets based on RE123 coated conductors

Progresses and challenges in the development of high-field solenoidal magnets based on RE123 coated conductors

Inkjet-Printed Chemical Solution Y2O3 Layers for Planarization of Technical Substrates

Thermal Conductivity of High Temperature Superconductor Coated Conductors

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