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The Progress on Low-Cost, High-Quality, High-Temperature Superconducting Tapes Deposited by the Combustion Chemical Vapor Deposition Process Shara S. Shoup, Marvis K. White, Steve L. Krebs, Natalie Darnell, Adam C. King, Dave S. Mattox, Ian H. Campbell, Ken R. Marken,1 Seung Hong,1 Bolek Czabaj,1 M. Paranthaman,2 Hans M. Christen,2 Hong-Ying Zhai,2 and Eliot Specht2 MicroCoating Technologies, Inc., 5315 Peachtree Industrial Blvd., Atlanta, GA 30341 1 Oxford Superconducting Technology, 600 Milik Street, P.O. Box 429, Carteret, NJ 07008-0429 2 Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831 ABSTRACT The innovative Combustion Chemical Vapor Deposition (CCVD) process is a non-vacuum technique that is being investigated to enable next generation products in several application areas including high-temperature superconductors (HTS). In combination with the Rolling Assisted Biaxially Textured Substrate (RABiTS) technology, the CCVD process has significant promise to provide low-cost, high-quality lengths of YBCO coated conductor. The CCVD technology has been used to deposit both buffer layer coatings as well as YBCO superconducting layers. A buffer layer architecture of strontium titanate and ceria have been deposited by CCVD on textured nickel substrates and optimized to appropriate thicknesses and microstructures to provide templates for growing PLD YBCO with high critical current density values. The CCVD buffer layers have been scaled to meter plus lengths with good epitaxial uniformity along the length. A short sample cut from one of the lengths enabled high critical current density PLD YBCO. Films of CCVD YBCO superconductors have been grown on single crystal substrates with critical current densities over 1 MA/cm2. Work is currently in progress to combine both the buffer layer and superconductor technologies to produce high-quality coupons of HTS tape made entirely by the non-vacuum CCVD process.

INTRODUCTION High-temperature superconductors hold great promise for offering tremendous energy and cost savings to the electric power industry. Over the past several years, scientists have investigated the potential YBCO coated conductors have to offer and have achieved very high current densities on single crystal substrates as well as coupon-sized flexible metallic substrates. Efforts are turning towards scaling the deposition process to obtain practical lengths of coated conductor to begin investigating “real product” usage. Once these trials have succeeded, the focus will be on achieving long length, large volume production at a cost that will be competitive with copper. Scaling is a task in itself with many factors to consider in maintaining the high quality over the long length while providing coated conductor at a viable cost. The CCVD technology has considerable potential to overcome many of the shortcomings of traditional vapor deposition techniques while yielding equal or better quality coatings at a lower cost. As a result, capital requirements and operating costs are reduced at least tenfold w