预载过程对YBCO块材磁体弛豫特性的影响  

INFLUENCE OF PRE-LOAD PORCESS ON THE RELAXATION PERFORMANCE OF MAGNETIZED BULK YBCO

作　　者：刘伟[1,2] 王素玉[2] 叶长青[2] 马光同[2] 郑珺[2] 李琳琳[1] 杨小峰[1] 王家素[2] 

机构地区：[1]成都理工大学核技术与自动化工程学院,成都610059 [2]西南交通大学超导技术研究所,成都610031

出　　处：《低温物理学报》2014年第1期65-69,共5页Low Temperature Physical Letters

基　　金：成都理工大学青年科学基金资助课题

摘　　要：通过预先磁化的方法可将高温超导块材制备成块材磁体,以有效提升悬浮系统的整体工作性能.未经磁化的高温超导块材处于悬浮状态时,其内部超导电流会随时间增长出现衰退,即存在弛豫现象.预载过程是一种抑制高温超导块材内部电流弛豫的有效方法,可以保证悬浮系统工作特性的稳定.然而,当高温超导块材经历磁化后,其内部已存在磁化超导电流,该磁化超导电流与悬浮过程中产生的超导电流相互叠加,产生独特的电流分布特性及弛豫特性.本论文主要探讨预载过程对高温超导块材磁体弛豫特性的影响,通过实验测试和对比分析,揭示不同磁化状态下弛豫过程的特点,从而为高温超导块材磁体在悬浮系统中的实际工程化应用提供有效的参考依据.The magnetized bulk high temperature superconductor （HTSC） can improve the levitation performance effectively. The supercurrent within an un-magnetized HTSC will decay with the increase of time, which is called the relaxation. The pre-load process is a useful method to suppress the relaxation of current within a bulk HTSC. However, there exists superposition of magnetization current and levitation current within a magnetized bulk HTSC during the levitation process, which will produce distinct current configuration and unique relaxation characteristics. This article primarily studies the influence of pre-load process on the relaxation performance of a magnetized bulk HTSC by experiment and comparison, which can supply beneficial references for the practical engineering application.

关 键 词：高温超导块材 磁化 弛豫 预载 悬浮性能 

分 类 号：TM265[一般工业技术—材料科学与工程]