Preparation of double-layer REBa2Cu3O7−δ tapes for enhancing engineering current density by Ag-diffusion bonding

IF 1.3 3区 物理与天体物理 Q4 PHYSICS, APPLIED
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Abstract

Second-generation high-temperature superconducting (2G-HTS) tapes with high engineering critical current densities (Je) are widely used in engineering and technology applications. This study introduced a twisting device that successfully layered two REBa2Cu3O7−δ films onto a single substrate. Heating the twisting device to above 600 °C induced Ag-diffusion bonding at the interface between the two tapes. A thin film pressure sensor detected a silver layer pressure of about 6.5 MPa. After the oxygen annealing treatment, a current increase of 81.7 A was observed using the four-probe method, which was a 1.5-fold enhancement over the original tape current, and the Je was increased from 560 A/mm2 to 790 A/mm2 at 77 K. The use of reverse bending annealing effectively improved the flexibility of the DHOS conductors. Through microanalysis, it was observed that the bonding between MgO and Y2O3 in the buffer layer was weak, resulting in the detachment of LaMnO3 and MgO together with the superconducting layer. The exfoliated buffer layer prevented oxygen penetration, adversely affecting the performance of the double HTS layers on one substrate (DHOS). Moreover, the coverage of the buffer layer increases with the number of layers complicating the complete peeling of the superconducting layer. Further detailed studies point out the direction of improvement for future work in preparing multilayer conductors.
制备双层 REBa2Cu3O7-δ 带,利用银扩散键增强工程电流密度
具有高工程临界电流密度(Je)的第二代高温超导(2G-HTS)磁带广泛应用于工程和技术领域。本研究引入了一种扭转装置,成功地将两层 REBa2Cu3O7-δ 薄膜分层到单个衬底上。将扭转装置加热至 600 ℃ 以上,可在两条带子的界面上诱导银扩散键合。薄膜压力传感器检测到银层压力约为 6.5 兆帕。经过氧气退火处理后,用四探针法观察到电流增加了 81.7 A,比原来的胶带电流增加了 1.5 倍,在 77 K 时,Je 从 560 A/mm2 增加到 790 A/mm2 。通过显微分析发现,缓冲层中 MgO 和 Y2O3 之间的结合力较弱,导致 LaMnO3 和 MgO 与超导层一起剥离。剥离的缓冲层阻止了氧气的渗透,从而对单层衬底双 HTS 层(DHOS)的性能产生了不利影响。此外,缓冲层的覆盖范围随着层数的增加而增大,使超导层的完全剥离变得更加复杂。进一步的详细研究为今后制备多层导体的工作指明了改进方向。
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来源期刊
CiteScore
2.70
自引率
11.80%
发文量
102
审稿时长
66 days
期刊介绍: Physica C (Superconductivity and its Applications) publishes peer-reviewed papers on novel developments in the field of superconductivity. Topics include discovery of new superconducting materials and elucidation of their mechanisms, physics of vortex matter, enhancement of critical properties of superconductors, identification of novel properties and processing methods that improve their performance and promote new routes to applications of superconductivity. The main goal of the journal is to publish: 1. Papers that substantially increase the understanding of the fundamental aspects and mechanisms of superconductivity and vortex matter through theoretical and experimental methods. 2. Papers that report on novel physical properties and processing of materials that substantially enhance their critical performance. 3. Papers that promote new or improved routes to applications of superconductivity and/or superconducting materials, and proof-of-concept novel proto-type superconducting devices. The editors of the journal will select papers that are well written and based on thorough research that provide truly novel insights.
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