高温超导涂层导体是解决当今能源危机的重要复合材料之一,而经济、有效、节能的制备技术是涂层导体广泛应用的关键.本文采用表面氧化外延法在Ni wt.5％W基带上普氩下中温氧化制备了立方织构的NiO种子层.通过对氧化温度和氧化时间两个主要因素分析,确定了NiO生长条件为普氩中790℃内保温20 mins.与高温(空气中1000℃以上)制备相比,降低了氧化膜制备温度.薄膜厚度大约为650 nm.最后在生成的NiO薄膜上化学溶液沉积了YBa2 Cu3O7δ/SmBiO3复合层,所得样品超导转变温度为89 K,77 K自场下临界电流密度为1.46 MA/cm2(77 K,零场).中温表面氧化外延法为涂层导体制备提供了一种实用可行路径.
Economic,efficient and energy-saving preparation techniques were the key factors for the application of superconducting coated conductors.The cube textured NiO seed layer was formed on Ni-wt.5％W tape by surfaceoxidation epitaxy in flowing argon gas.Though the systematic investigation of the oxidizing temperatures and time on the NiO layer quality,the appropriate conditions for NiO epitaxial growth were oxidizing at 790 ℃ for 20 mins in the flowing argon gas.Compared with the high temperature (above 1000 ℃ in air) the preparation procedure greatly reduced the oxidation temperature.The thickness of the NiO seed layer was about 650 nm.The YBa2Cu3O7-δ/ SmBiO3 layers were deposited on NiO layer,the YBCO film with superconducting transition temperature of 89 K and the critical current density of 1.46 MA/cm2 (77 K,self-field) was obtained by chemical solution deposition method.The surface-oxidation epitaxy method with medium temperature was provided for the preparation of YBCO coated conductors.
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