Superconducting tapes using ISD buffer layers produced by evaporation of MgO or reactive evaporation of magnesium

Metzger, R.; Bauer, Markus; Numssen, K.; Semerad, R.; Berberich, P.; Kinder, H.

doi:10.1109/77.919651

Cited by 26 publications

(14 citation statements)

References 6 publications

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“…In this work, all 2G HTS CC samples used as a template came from a reel-to-reel manufacturing unit of THEVA . 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%

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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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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“…It is clear that even a small defect produces the extended hot spot that effectively blocks the entire cross-section and can result in thermal instabilities 75 . insight review articles present IBAD-MgO-coated conductors is not yet as good as in IBAD-YSZ variants 93 . The inclined substrate deposition (ISD) 94 process is much quicker than IBAD, but the texture is significantly worse 95 . Ion-texturing processes for buffer-layer deposition 96 are receiving renewed attention owing to their simplicity, but their success depends on producing sufficient texture so to compete with the slower and more expensive IBAD process.…”

Section: Materials Fabrication Considerationsmentioning

confidence: 99%

High-Tc superconducting materials for electric power applications

Larbalestier

Gurevich

Feldmann

et al. 2001

Nature

1,198

764

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Large-scale superconducting electric devices for power industry depend critically on wires with high critical current densities at temperatures where cryogenic losses are tolerable. This restricts choice to two high-temperature cuprate superconductors, (Bi,Pb)2Sr2Ca2Cu3Ox and YBa2Cu3Ox, and possibly to MgB2, recently discovered to superconduct at 39 K. Crystal structure and material anisotropy place fundamental restrictions on their properties, especially in polycrystalline form. So far, power applications have followed a largely empirical, twin-track approach of conductor development and construction of prototype devices. The feasibility of superconducting power cables, magnetic energy-storage devices, transformers, fault current limiters and motors, largely using (Bi,Pb)2Sr2Ca2Cu3Ox conductor, is proven. Widespread applications now depend significantly on cost-effective resolution of fundamental materials and fabrication issues, which control the production of low-cost, high-performance conductors of these remarkable compounds.

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“…A protective Ag layer of a few micrometers and a thicker Cu protection and stabilization layer complete the conductor [76]. The textured template is created by one of two basic methods, either by texturing the buffer layer by ion beam assisted deposition (IBAD) [67]- [71], [77], or inclined substrate deposition (ISD) [78], [79], or by deformation texturing the metal substrate with the rolling assisted biaxially textured substrate approach [72]- [74] and applying epitaxial oxide buffer layers (trademarked RABiTS by Oak Ridge National Laboratory, Oak Ridge, TN).…”

Section: Ybco-coated Conductorsmentioning

confidence: 99%

“…The X-ray pole-figure FWHM of recent IBAD-MgO coated conductors is much better than for IBAD-YSZ, being of order 2-4 and, thus, genuinely approaching single crystal structure for the YBCO overlayer [70], although performance so far does not fully reflect this unusually high degree of texture, and achieving the required atomic level surface roughness over long lengths has proven challenging. The inclined substrate deposition (ISD) process is more rapid than YSZ-IBAD, since there is no resputtering during deposition, but in work to date, the texture is not as high [78], [79]. ISD may also permit simpler buffer structures.…”

Section: Ybco-coated Conductorsmentioning

confidence: 99%

Superconducting materials for large scale applications

2004

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Superconducting tapes using ISD buffer layers produced by evaporation of MgO or reactive evaporation of magnesium

Cited by 26 publications

References 6 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

High-Tc superconducting materials for electric power applications

Superconducting materials for large scale applications

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Superconducting tapes using ISD buffer layers produced by evaporation of MgO or reactive evaporation of magnesium

Cited by 26 publications

References 6 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

High-Tc superconducting materials for electric power applications

Superconducting materials for large scale applications

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Product

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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