Progress towards a low-cost commercial coated conductor

摘要

YBCO films prepared from metal trifluoroacetate (TFA) precursors on oxide-buffered textured non-magnetic substrates have achieved performance levels equaling that on oxide buffered textured Ni substrates. Critical current densities of 0.7 MA/cm{sup}2 to 1.0 MA/cm{sup}2 have been achieved in 0.4 μm thick YBCO films on short-length of CeO{sub}2/YSZ/Y{sub}2O{sub}3/Ni/Ni-13wt%Cr substrates. High-quality epitaxial buffers comprising a Ni layer, Y{sub}2O{sub}3 seed, YSZ barrier and CeO{sub}2 cap layers have been deposited over meter long tapes of deformation textured Ni and Ni-13%Cr using reel-to-reel processes. High-performance TFA-based YBCO films have been deposited on 0.1 m to 0.3 m lengths of these oxide buffered substrates using reel to reel processes. Critical current densities up to 1.0 MA/cm{sup}2 have been achieved in 0.4 μm thick YBCO films on CeO{sub}2/YSZ/Y{sub}2O{sub}3/Ni substrates. Using multiple coats of the metal trifluoroacetate precursors, thicker YBCO films have been demonstrated on oxide buffered substrates. Critical currents in excess of 100A/cm-width have been achieved for 1.2 μm - 1.6 μm thick YBCO films on short lengths of CeO{sub}2/YSZ/Y{sub}2O{sub}3/Ni substrates.