Development of BZO Doped YGdBCO High Performance Long CCs Using TFA-MOD Process

TFA-MOD (Metal Organic Deposition using Trifluoro-acetates) process is of considerable practical concern for future applications since it can fabricate high performance coated conductors (CCs) with low cost. We have previously reported the success in fabricating a short sample of BaZrO3 (BZO) nanoparticles dispersed Y0.77Gd0.23Ba1.5Cu3Oy (YGdBCO) thick films with high Ic values under magnetic field (67.8A/cm-w, @77K, 3T). To make thick CCs for long length, it is important to study the effect of process parameters varying with time. In this study, we investigated the effect of coating solution characteristics such as viscosity etc., which could vary with time due to evaporation of solvent, on the transverse film thickness distribution by using Reel-To-Reel (RTR)-dip coating method. We successfully fabricated BZO doped YGdBCO calcined films with 2.5 μm thickness without crack and delamination over 200 m in length. The precursor films were crystallized by the batch type furnace at SWCC Showa Cable Systems Co., Ltd. resulting in the 124 m long CC with high Ic minimum value of 50 A/cm-w at 77 K and 3 T.