期刊
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
卷 17, 期 2, 页码 3235-3238出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2007.900041
关键词
high-temperature superconductors; superconducting films; superconducting materials mechanical factors; superconducting tapes
Recent progress is reported in the development of long lengths (up to 100 m) of YBCO coated conductors with good mechanical stability and improved critical current homogeneity. A non-magnetic CrNi stainless steel tape, 0.1 mm thick, is employed as a substrate tape. Prior to deposition, the tape is coated with yttria stabilized zirconia in the form of a bi-axially textured buffer layer, using a novel alternating beam assisted deposition technique. After deposition of a ceria cap layer onto the buffer, YBCO films are deposited employing a high-rate pulsed laser deposition method that allows higher critical current densities and incurs a lower YBCO loss (similar to 10%) than other deposition techniques. The last processing step consists of coating the with a thin layer of silver or gold and a 2-40 mu m thick copper shunt layer. In 40 m long tapes with a 1 mu m thick YBCO film (at 77 K and zero external field), critical current, I-c, up to 235 A per cm-width were obtained. Higher critical currents, up to 574 A per cm, were achieved in short 0.2-7 m sections corresponding to current densities, J(c), of up to 4.4 MA/cm(2). The critical current homogeneity and performance of our improved coated conductors under applied temperature cycling, multiple quench-recovery cycles, and repeated bending are reported.
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