ReBa2Cu3O7-x(ReBCO{Re} =Y or rare earth) coated conductors are currently available as ribbon-shaped conductors. The high aspect ratio of such conductors is often regarded as a limitation for many electrotechnical applications due to the anisotropy of the electrical and mechanical properties and high ac losses. In this view, a method for the development of cube-textured, low aspect ratio wire substrate for ReBCO coated conductor is presented. The method is derived from the conventional cold-rolling and recrystallization process and modified to obtain a cube-textured wire with low aspect ratio rectangular cross section. To show the feasibility of the method, pure copper was used as raw material. Cube-textured copper substrate with a square cross section and a thickness around 0.5 mm was realized by longitudinally cutting a heavily cold-rolled thick tape. All 4 sides of the wire show a strong cube texture development. Cube texture development is comparable with the one obtained in standard tapes, with a fraction of cube-oriented area above 95% and a full width at half maximum of (002) omega-scan ranging from 6.5 ° to 7.5 ° . The quality of the obtained surfaces was tested through the epitaxial growth of MgO/Pd bilayer. Preliminary results indicate that all 4 sides of the wire are equally available for epitaxial film growth and lead to a comparable film quality. © 2015 IEEE.

Development of low aspect ratio coated conductor

Celentano, G.;Rufoloni, A.;Galluzzi, V.;Pinto, V.;Mancini, A.;Rizzo, F.;Fabbri, F.;Augieri, A.;Vannozzi, A.
2015

Abstract

ReBa2Cu3O7-x(ReBCO{Re} =Y or rare earth) coated conductors are currently available as ribbon-shaped conductors. The high aspect ratio of such conductors is often regarded as a limitation for many electrotechnical applications due to the anisotropy of the electrical and mechanical properties and high ac losses. In this view, a method for the development of cube-textured, low aspect ratio wire substrate for ReBCO coated conductor is presented. The method is derived from the conventional cold-rolling and recrystallization process and modified to obtain a cube-textured wire with low aspect ratio rectangular cross section. To show the feasibility of the method, pure copper was used as raw material. Cube-textured copper substrate with a square cross section and a thickness around 0.5 mm was realized by longitudinally cutting a heavily cold-rolled thick tape. All 4 sides of the wire show a strong cube texture development. Cube texture development is comparable with the one obtained in standard tapes, with a fraction of cube-oriented area above 95% and a full width at half maximum of (002) omega-scan ranging from 6.5 ° to 7.5 ° . The quality of the obtained surfaces was tested through the epitaxial growth of MgO/Pd bilayer. Preliminary results indicate that all 4 sides of the wire are equally available for epitaxial film growth and lead to a comparable film quality. © 2015 IEEE.
coated conductors;epitaxial film growth;cube-textured substrates;High-temperature superconductors
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/2303
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