双面高温超导带材研究进展

介绍了采用反应溅射法制备双面Y2O3双面种子层长带材，通过引入水汽使Y原子在RABiTS基带上氧化成膜，同时有效的避免了基带的氧化。通过对工艺参数的优化，成功制备了高质量的Y2O3种子层，其面内面外半高宽仅为3．8°和1．4°，大大改善了金属基带的双轴织构特性，同时薄膜表面粗糙度仅为2．8nm。在制备的高质量种子层上采用溅射方法外延生长YSZ阻挡层和CeO2模板层，薄膜表面光滑，并具有良好的均匀性和双面一致性。用双倒简靶溅射法制备YBCO超导层，采用旋转结合轴向自动进退，改善了薄膜受热不均的现象，获得了高质量的双面高温超导带材。其中短样双面临界电流L之和超过了400A／cm-w，同时成功制备了长度超过1米，Ic〉210A／cm-w的双面高温超导带材。

Progress in Research of Double-Sided Coated Conductors

High quality long double-sided Y2O3 seed layer was prepared with reactive sputtering method. The water vapor was used to form yttrium oxide thin film while avoiding the oxidation of the RABiTS substrate. And high quality Y2O3 seed layer was successfully fabricated. The full widths at halt maximum of in-plane and out-of-plane rocking curves of the Y2O3 seed layer were only 3.8° and 1.4°, respectively. The texture of the seed layer was much better than that of the metallic substrate. The surface roughness （RMS） is 2.8 nm. YSZ barrier layer and CeO2 cap layer were sputtered consequently on top of the Y2O3 seed layer. The film surface is smooth and crack free. Both the microstructure and surface morphology of the buffer layer is uniform along the tape length on hoth sides. YBCO superconducting layer was prepared with inverted cylindrical opposited target sputtering. Using rotation and automatic back and forth movement along the axis, the uniformity of the film is improved. High quality double-sided coated conductors with lc over 400 A/cm-width in short sample, and Ic 〉 210 A/cm-width in lm long tape were successfully fabricated.