准单畴YBCO超导体工艺性能研究和微观分析

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详细信息

Study on the Technology and Microstructural Analysis for Quasi-single Crystal Domain Melt-textured YBCO Bulk Superconductor

摘要: 采用熔融织构生长法 (MTG)结合顶部籽晶工艺 (TSP)制备了不同Y 2 11粒子含量的准单畴熔融织构的YBCO块材, 样品致密度高, 机械强度好。VSM测量结果表明 :样品在 30K、0 6T下, 临界电流密度JC 达到 1 2 3× 10 6A/cm2 在 70K、2T下, JC 为 1 35× 10 4 A/cm2, 且JC 对磁场不敏感。SEM分析结果表明 :Y 2 11相的掺杂能够改善织构样品的生长状况, 同时, 掺杂的Y 2 11粒子又能作为强的钉扎中心所制备的样品中Y 2 11粒子分布越均匀, 尺寸越小, 其钉扎效果越好
- 准单畴 ,
- 熔融织构YBCO超导体 ,
- 临界电流密度 ,
- 钉扎中心
Abstract: The paper describes the method of melt textured growth(MTG) with a top seeded technique to prepare the quasi single crystal domain YBCO bulk materials with various Y 211 particle contents. The obtained specimens have high density and good mechanical toughness. The J C of specimens reaches 1.23×10 6 A/cm 2 under 0.6 T at 30 K and 1.35×10 4 A/cm 2 under 2 T at 70 K. The SEM observation of specimens indicates that Y 211 particles can improve the quality of melt textured YBCO superconductor. Combining the microstructures with J C measurements shows that the smaller the particle size and the more homogeneous the particle distribution is, the better the pinning effectiveness is.
- quasi single domain ,
- melt textured YBCO superconductor ,
- pinning center ,
- undefined

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