径向温度梯度对熔化生长大块YBCO超导体形貌及性能的影响  

The Effects of Radial Temperature Gradient on the Macrostructure and Properties of MTG Large Bulk YBCO Superconductor

作　　者：杨万民[1] 汪京荣[1] 张翠萍[1] 李建平[1] 王天成[1] 张平祥[1] 吴晓祖[1] 周廉[1] 

机构地区：[1]西北有色金属研究院

出　　处：《稀有金属材料与工程》1996年第4期30-33,共4页Rare Metal Materials and Engineering

摘　　要：用实验的方法研究了径向温度梯度对熔化生长ＹＢＣＯ大块超导体形貌及性能的影响。结果表明，正的径向温度梯度有利于抑制ＹＢＣＯ大块超导体的成核数，制得的样品具有扇形形貌，晶畴区少而大，样品具有高的磁悬浮力。负的径向温度梯度则不然，制得的样品无规则形貌，晶畴区多且小，磁悬浮力低。The effects of radial temperature gradient on the macrostructure and properties of MTG bulk YBCO superconductor have been investigated. The results indicate that a positive radial temperature gradient is favourable for depressing the nucleation number of YBCO bulk superconductors during the MTG process. Samples fabricated in this way is composed of a few large fan-shaped YBCO Superconducting crystal domains, and its magnetic levitation force is higher. On the contrary, a negative radial temperature gradient is favourable for randomly nucleation, and produces a sample with many small crystal domains randomly oriented. The magnetic levitation force of the sample is lower.

关 键 词：径向温度梯度 熔化生长 大块YBCO 超导体 性能 

分 类 号：TM260.14[一般工业技术—材料科学与工程]