Progress towards a low-cost coated conductor technology

Abstract

Progress in the development of an economically and technically viable YBCO coated conductor technology for HTS wire using deformation-textured buffered substrates and solution-deposited superconductor layers is reported. Biaxially textured Ni substrates have been fabricated using a deformation texturing process. Epitaxial oxide buffer layers have been deposited by a combination of e-beam deposition and magnetron sputtering. Epitaxial YBCO films have been grown using a trifluoroacetate solution precursor. The resulting composite conductors have critical current densities approaching 2 MA/cm 2 at 77K in self-field. Critical current densities of 4.5 MA/cm 2 have been also obtained on CeO 2 buffered YSZ single crystal substrates, demonstrating performance parity with vacuum deposited YBCO films.

Epitaxial Solution Deposition of YBa2Cu3O7−δ‐Coated Conductors

“…has demonstrated growth of TFA YBCO films to as thick as 0.5–1 μm with 1 MA/cm 2 J c values through use of a tailored heat treatment schedule. Other efforts, in collaboration with American Superconductor, have demonstrated J c >1 MA/cm 2 values on (200)‐oriented RABiTS Ni tape substrates buffered with e‐beam‐deposited CeO 2 /YSZ/CeO 2 buffer layers 43 . Research continues in this collaboration with ties to Oak Ridge National Laboratories, 44 with goals of long length processing and thick YBCO processing in pursuit of a $10/kA·m price‐performance target.…”

“…Other efforts, in collaboration with American Superconductor, have demonstrated J c 41 MA/cm 2 values on (200)-oriented RABiTS Ni tape substrates buffered with e-beam-deposited CeO 2 /YSZ/CeO 2 buffer layers. 43 Research continues in this collaboration with ties to Oak Ridge National Laboratories, 44 at ISTEC (Tokyo, Japan) have deposited B0.25-mm YBCO films with J c (77 K, 0 T) of 1.3-2.5 MA/cm 2 on IBAD CeO2/YSZ/Hastelloy substrates. In their work, high-viscosity solutions are used to deposit thicker perlayer coatings, where 2.31 and 2.78 mol/L YB 2 C 3 concentrations result in film thicknesses of 0.3 and 0.45 mm, for instance.…”

All solution-chemistry approach for YBa2Cu3O7−δ-coated conductors

“…7 Several papers report the use of sol-gel for the growth of high-quality YBCO films on metals, or for one of several buffer layers in a sometimes complex buffer stack. [8][9][10][11][12][13] This is the first report of a coated conductor fabricated solely using sol-gel methods for all layers.…”

Effect of temperature and film thickness on microstructure and residual stress for YbBCO-coated conductors

“…Electrical performance, low cost and long-length are major factors for fabrication of YBCO-coated conductors which are very attractive for electrical power application and superconducting magnet technology [1][2][3]. Second generation/YBCO-coated conductors have been developed by using three major approaches [4][5][6].…”