细化211粒子及降低渗氧温度对YBCO超导块材性能的影响  

EFFECTS OF REFINEMENT OF Y-211 PARTICLES AND LOWER OXYGENATION TEMPERATURE ON THE SUPERCONDUCTING PROPERTIES OF BULK YBCO

作　　者：唐晓东[1] 于泽民[1] 张翠萍[1] 汪京荣[1] 冯勇[1] 周廉[1] 

机构地区：[1]西北有色金属研究院,西安市51信箱710016

出　　处：《低温物理学报》2003年第A01期202-206,共5页Low Temperature Physical Letters

基　　金：国家"973"计划 (项目编号 :NKBRSE G19990 646)资助的课题~~

摘　　要：本文研究了在原始粉末中加入CeO2 及预烧结温度对控制Y 2 1 1粒子尺寸的影响和低温渗氧工艺对Tc 的影响 .实验表明 ,当预烧结温度从 940℃降低到 90 0℃时 ,这种工艺改变对细化 2 1 1粒子的影响比掺CeO2 的作用大 .在降低预烧结温度时 ,实验获得的最大磁悬浮力达到了 1 2 .7N/cm2 .渗氧温度不仅影响临界转变温度等超导性能而且会影响YBCO块材的组织结构 .研究发现对熔融构YBCO块材而言 ,采用低温渗氧工艺是比较适合的 ,即渗氧温度在 40 0℃～ 50 0℃之间 ,如果超过 50 0℃ ,样品中的宏观裂纹会增多 .The effects of CeO-2 addition and lower per-sintering temperature on size of Y-211 particles were studied in this paper. The results show that decreasing the pre-sintering temperature is more effective than adding CeO-2 for reducing the size of Y-211 particles and the maximum levitation force is about 12.7N/cm2 as decreasing the per-sintering temperature. In addition, the effects on T-c of samples were also studied by using lower oxygenation temperature. The oxygenation temperature affects not only T-c, but also the microstructure of bulk YBCO. This results indicate that the low oxygenation temperature is suitable for the oxygenation process of the melt-textured bulk YBCO. At the same time, if the oxygenation temperature is above 500℃, the macro-cracks will propagate.

关 键 词：高温超导 顶部籽晶熔融织构法 渗氧温度 YBCO超导体 临界电流 磁悬浮力 临界温度 

分 类 号：O511.9[理学—低温物理]