分层式前驱坯体对YBCO单畴块材生长和磁通性能的影响

doi:10.15541/jim20150057

摘要/Abstract

摘要：

Y-Ba-Cu-O(YBCO)单畴块材通常是由统一分布的YBa₂Cu₃O_7-_δ(Y123)和Y₂BaCuO₅(Y211)前驱坯体制备的。然而研究表明熔融生长的超导块材中Y211相粒子的浓度随着远离籽晶显著增大, 造成Y211相粒子的积聚以及限制单畴块材的超导性能。本文通过顶部籽晶熔融织构法(TSMTG)利用分层式前驱坯体制备了φ23 mm×9 mm的YBCO单畴块材, 并在生长形貌、微结构以及磁通俘获性能方面与常规方法制备的同尺寸YBCO单畴块材做了对比研究。研究结果显示, 使用分层式前驱坯体制备的YBCO单畴块材生长得更充分, Y211相粒子的平均粒径更小、分布更均匀, 并且在磁通俘获性能上有了显著的提高, 同时具备高对称性的磁通分布和强磁通俘获能力, 在77 K环境下最大磁通俘获场高达0.91 T。该结果对进一步提高YBCO超导块材的性能具有很好的参考价值。

关键词: 分层式前驱坯体, YBCO, 磁通俘获场

Abstract:

The fabrication of single domain Y-Ba-Cu-O(YBCO) bulk superconductors usually involves precursor pellets that contain a uniform distribution of YBa₂Cu₃O_7-δ(Y123) and Y₂BaCuO₅(Y211) compounds. However, the concentration of Y211 phase particles in the fully melt processed superconducting bulk increases significantly with distance from the seed, leading to accumulation of Y211 phase particles and degradation of superconducting properties. By top seeded melt texture growth (TSMTG) process, single domain YBCO bulk superconductors at about 23 mm in diameters, and 9 mm in thickness were fabricated from layered precursor pellets and conventional precursor pellets, respectively. The growth morphology, microstructure and magnetic flux properties of both layered and conventional pellets were comparatively studied. The experiments suggest that the layered precursor pellets allow a sufficient growth in c growth sector, a more uniform distribution of Y211 phase in the matrix and a significant enhancement of the trapped field. Thus for the layered pellets, a trapped magnet field of 0.91 T is achieved at 77 K and the flux distribution is also of high symmetry. The present results are very valuable for further improving the properties of YBCO bulk superconductors.

Key words: layered precursor powders, YBCO, trapped field

中图分类号:

TQ174

唐天威, 邱傅杰, 吴董杰, 徐克西. 分层式前驱坯体对YBCO单畴块材生长和磁通性能的影响[J]. 无机材料学报, 2015, 30(9): 963-970.

TANG Tian-Wei, QIU Fu-Jie, WU Dong-Jie, XU Ke-Xi. Influence on Processing and Magnetic Flux Properties of Single Grain YBCO Fabricated from Layered Precursor Powders[J]. Journal of Inorganic Materials, 2015, 30(9): 963-970.

图/表 8

图1 YBCO坯体示意图

Fig. 1 Schematic diagram of YBCO precursor pellets (a) Conventional pellet; (b) Layered pellet

图2 YBCO单畴块材表面形貌照片

Fig. 2 Surface morphologies of YBCO (a) N1; (b) N2; (c) L1; (d) L2

图3 YBCO单畴块材经过抛光处理后的俯视图照片

Fig. 3 Top view of YBCO after polishing process (a) N1; (b)L1

图4 溶质扩散生长模型(a)和沿c轴方向成核包晶生长(b)示意图

Fig. 4 Schematic diagram of solute diffusion model (a) and nucleation along the c-axis (b)

图5 YBCO单畴块材样品磁通俘获场三维图

Fig. 5 Trapped field of YBCO in 3D (a) N1; (b) N2; (c) L1; (d) L2

图6 YBCO单畴块材样品磁通俘获场二维图

Fig. 6 Trapped field of YBCO in 2D (a) N1; (b) N2; (c) L1; (d) L2

图7 YBCO单畴块材切割面示意图

Fig. 7 Schematic diagram of cross section of YBCO

图8 YBCO单畴块材N1(a)和L1(b)的微结构照片

Fig. 8 Microstructures of (a) N1 and (b) L1 YBCO observed by SEM

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