籽晶法YBCO超导块材的制备及其磁化性能研究  

FABRICATION OF LARGE YBCO BULK MATERIAL BY SEED TECHNIQUE AND STUDY ON ITS MAGNETIZATION

作　　者：蔡传兵[1] 傅耀先[1] 孙越[1] 龚尚敏[1] 张宏[1] 

机构地区：[1]中科院上海冶金所

出　　处：《功能材料与器件学报》1996年第1期25-31,共7页Journal of Functional Materials and Devices

基　　金：国家超导中心资助

摘　　要：以ＳｍＢａＣｕＯ超导晶粒为籽晶，制备了具有大晶粒的ＹＢａＣｕＯ超导块材。磁化强度和交流磁化率表明该材料具有较强的磁通钉扎和良好的晶界连接特性。较强的磁通钉扎使大块样品在磁化后能冻结大量磁通，表现出很好的剩磁性能，经０．５Ｔ永磁体磁化后，实验测得其表面剩磁场最大值为０．１２５Ｔ，且在短时间内这一剩磁场没有明显的衰减。The YBaCuO bulk material with large superconducting domains was fabricated using MTG SmBaCuO superconductive crystal as a growth seed. The strong flux pinning and well intergrain linking could be drawn from the investigations on D.C.and A.C.magnetizing behaviours. The strong flux pinning made it possible for the YBCO bulk with large domain to capture a great deal of flux after the the applied field was removed, and such a bulk sample showed a good quasi-permanent magnet characteristics, The residual magnetic field intensity Hrem was measured to be 0.125T after a large YBCO bulk was magnetized in several minutes under a NdFeB permanent magnet with surface field of 0.5T.And we did not find the evident degradation of Hrem in a short time.

关 键 词：籽晶法 YBCO 超导块 超导体 磁化性能 

分 类 号：TM26[一般工业技术—材料科学与工程]