Development of Non-Magnetic Biaxially Textured Tape and MOCVD Processes for Coated Conductor Fabrication

Abstract In this article we summarize our results on the fabrication process of the Ni-Cr-W biaxially textured tape, which is non-magnetic at 77 K. The deposition processes of the buffer and HTS layers by reel-to-reel MOCVD technology are described as well. The HTS wire is finished with reel-to-reel depositions of the silver protective layer by magnetron sputtering and copper stabilizing layer by electroplating. Sharp cubic texture with in-plane and out-of-plane misorientation below 7 degrees and low surface roughness (Ra 2 area) have been achieved on reel-to-reel processed metallic tapes. The texture characteristics of the MgO buffer layer (ΔωRD = 6.0, ΔωTD = 9.0, ΔφTRUE = 5.2) have been found to be very close to those of the textured substrate tape. Using this structure with additional buffer layers we have succeeded in growing superconducting YBCO coatings with Ic (77 K, s.f.) values higher than 120 A per cm of the tape width at the HTS layer thickness of about 1 μm.