准单畴YBCO超导体工艺性能研究和微观分析  

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

作　　者：沙建军[1] 郁金南[1] 郁刚[1] 韩华[1] 罗金汉[1] 

机构地区：[1]中国原子能科学研究院反应堆工程研究设计所,北京102413

出　　处：《原子能科学技术》2001年第2期116-120,共5页Atomic Energy Science and Technology

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 。This paper describes the method of melt-textured growth with the 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 toughness. The JC of specimens reaches 1.23×106 A/cm2 under 0.6 T at 30 K and 1.35×104 A/cm2 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 microstructure with JC measurement it is shown that the smaller the particle size and the more homogeneous the particle distribution are, the better the pinning effectiveness will be.

关 键 词：准单畴 熔融织构 YBCO超导体 临界电流密度 钉扎中心 聚变堆材料 熔融织构生长法 

分 类 号：TL627[核科学技术—核技术及应用] TM264[一般工业技术—材料科学与工程]