High Performance Coated Conductors Fabricated by UTOC-MOD Process
High Performance Coated Conductors Fabricated by UTOC-MOD Process
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采用 UTOC-MOD 工艺制造的高性能涂层导体
DOI：
10.1109/tasc.2019.2908241
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发表时间：
2019
影响因子：
1.8
通讯作者：
Masayoshi Inoue
中科院分区：
文献类型：
--
作者：
Teruo Izumi;Koichi Nakaoka;Michio Sato;Takato MacHi;Akira Ibi;Ryuji Yoshida;Takeharu Kato;Masashi Miura;Takanobu Kiss;Masayoshi Inoue
为了提高金属有机物沉积（MOD）的现场性能，开发了一种使用含金属三氟乙酸盐的前驱体溶液的MOD工艺。在该方法中，通过在涂覆和煅烧步骤中减小一次涂覆的厚度，可以使BaMO 3（M：金属元素如Zr和Hf）材料的钉扎中心更精细。这被称为超薄一次涂覆（UTOC）-MOD工艺。这一过程改善了现场性能。UTOC-MOD工艺还具有二维Jc分布均匀的优点，这是使用扫描霍尔探针显微镜分析确定的。改善的Jc均匀性也证实了基于划线磁带。基于与通过常规工艺获得的结果的比较，确定了UTOC-MOD带中的屈服临界电流值的较小分散。关于机械强度，确定了抑制了使用螺柱拉伸设备评价的分层强度的分散。微结构分析表明，UTOC膜是无孔的，虽然大孔存在于膜中时，利用常规MOD。微观结构的这种差异可以归因于上述UTOC-MOD膜的均匀性的改善。
A new metal organic deposition (MOD) process using precursor solution containing metal trifluoroacetates was developed to improve in-field performance. In this process, the pinning centers of BaMO3(M: metal elements such as Zr and Hf) materials could be made to be finer by reducing the once coating thickness in the coating and calcination step. This is referred to as the ultra-thin once coating (UTOC)-MOD process. This process improves the in-field performance. The UTOC-MOD process also has the advantage of uniformity of 2-dimensionalJc-distribution, which was determined using a scanning hall-probe microscopy analysis. Improvement of theJcuniformity was also confirmed based on scribed tapes. A smaller dispersion of the filament-critical current values in the UTOC-MOD tape was determined based on a comparison with the results for obtained by a conventional process. With respect to the mechanical strength, it was established that the dispersion of the delamination strength, which was evaluated using stud-pull equipment, was suppressed. Microstructural analysis revealed that, the UTOC films were pore-free, although large pores are present in the films when conventional MOD is utilized. This difference in the microstructure can be attributed to the aforementioned improvement in the uniformity of the UTOC-MOD films.
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