Effect of sintering time on the characteristics of YBCO coated-conductor joints using nano-silver paste

IF 1.3 3区物理与天体物理 Q4 PHYSICS, APPLIED Physica C-superconductivity and Its Applications Pub Date : 2024-05-02 DOI:10.1016/j.physc.2024.1354485

Ming Wang , Wentao Wang , Leilei Han , Jiajun Chen , Yu Chen , Yun Wu , Yong Zhao

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Abstract

Jointing YBa₂Cu₃O_7-z (YBCO) superconducting coated-conductor (CC) tapes is becoming increasingly significant for magnet applications because of the limited length of single tapes. In this work, YBCO CC tapes stabilized by silver were connected by low-temperature sintering of nano-silver paste. The effect of sintering time and lapped length on the electrical properties of YBCO joints were systematically investigated. And the correlation between microstructure and bonding force of the joints with extending the sintering time was established. It is found that joints sintered within 1∼5 min exhibit relatively lower resistance, while the maximum axial tensile strength at room temperature (RT) was improved with increasing sintering time. Considering the electromechanical properties, ten min is selected as the optimal sintering time for nano-silver paste. The joint by this efficient technology possesses closely connected interface, similar critical current and axial tensile strength (RT) to the single CC tape. The joint resistivity is as low as ∼12.5 nΩ·cm², which is much less than the traditional soldering joint.

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烧结时间对使用纳米银浆的 YBCO 涂层导体接头特性的影响

由于单条带的长度有限，连接 YBa2Cu3O7-z （YBCO）超导涂层导体（CC）带在磁体应用中正变得越来越重要。在这项研究中，通过低温烧结纳米银浆，连接了银稳定的 YBCO CC 磁带。系统研究了烧结时间和搭接长度对 YBCO 接头电气性能的影响。并确定了延长烧结时间与接头微观结构和结合力之间的相关性。研究发现，在 1∼5 分钟内烧结的接头电阻相对较低，而室温（RT）下的最大轴向拉伸强度则随着烧结时间的延长而提高。考虑到机电特性，选择 10 分钟作为纳米银浆的最佳烧结时间。采用这种高效技术制成的接头具有紧密连接的界面，临界电流和轴向拉伸强度（RT）与单一 CC 带相似。焊点电阻率低至 ∼12.5 nΩ-cm2，远低于传统焊点。

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来源期刊

Physica C-superconductivity and Its Applications 物理-物理：应用

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.