快速凝固法制备大尺寸MgB_2超导体  

Preparation of Bulky MgB_2 Superconducting Materials by Rapid Solidification

作　　者：张安民[1] 刘永长[1] 史庆志[1] 韩雅静[1] 

机构地区：[1]天津大学材料科学与工程学院金属材料系,天津300072

出　　处：《材料导报》2005年第10期94-96,共3页Materials Reports

基　　金：国家自然科学基金项目(No.50401033);天津市自然科学基金项目(No.033608811);全国优秀博士学位论文作者专项基金项目(No.200335)

摘　　要：简单化合物 MgB_2超导性的发现引起了世界科学家对其组织结构、超导原理、制备方法及应用前景的广泛兴趣。针对 MgB_2单晶制备过程中存在镁的气化温度很低,MgB_2在镁的沸点以下溶解度很小等不利因素,在国际上率先提出了从过冷熔体中的相选择与控制入手,采用深过冷快速定向凝固技术来制备高品质、大尺寸 MgB_2单晶的新思路。The discovery of superconductivity in the simple MgB2 crystalline intermetallic compound has aroused the interests of world scientists to investigate extensively the structure of MgB2, the superconducting mechanism, the synthesis methods and prospects for its commercial use. Aiming at the factors of the very low temperature of gasification, the small solubility of MgB2 in the Mg melt below boiling point, new consideration in view of the phase selection and governing from rapid solidification melt is proposed to prepare the high quality, bulky MgB2 single-crystal by means of rapid directional solidification technology of undercooled melt.

关 键 词：MGB2 超导性 单晶 深过冷 快速凝固 MGB2超导体 制备方法 大尺寸 快速凝固法 定向凝固技术 

分 类 号：TG244.3[金属学及工艺—铸造] TM26[一般工业技术—材料科学与工程]