降温速率对Bi-2223/AgAu带材微观结构和传输性能的影响（英文）  

Effects of Cooling Rate on the Microstructures and Transport Properties of AgAu Sheathed Bi-2223 Tapes

作　　者：马小波 张胜楠[2] 于泽明[2] 刘国庆[2] 焦磊[2] 郑会玲[2] 李成山[2] 张平祥[1,2] 李金山[1] Ma Xiaobo;Zhang Shengnan;Yu Zeming;Liu Guoqing;Jiao Lei;Zheng Huiling;Li Chengshan;Zhang Pingxiang;Li Jinshan(State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072,China;Northwest Institute for Nonferrous Metal Research, Xi’an 710016,China)

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2019年第6期1814-1818,共5页Rare Metal Materials and Engineering

基　　金：National Key Project of Magneto-Constrained Fusion Energy Development Program(2015GB115001)

摘　　要：采用PIT工艺制备了单芯Bi-2223/AgAu带材,系统地研究了第二次热处理阶段(HT2)降温速率对带材相组成、微观结构和传输性能的影响。结果表明:随着降温速率的减小,富铅相3321不断增加,CuO颗粒尺寸逐渐增大。当冷却速率从600℃/h减小到1℃/h时,临界电流密度Jc从7 kA/cm^2增加到11.5 kA/cm^2,增加了64%。由于晶间连接性能和磁通钉扎性能的提高,在较低的降温速率下,Bi-2223/AgAu带材在磁场下的临界电流密度也得到了提高。Monofilament AgAu sheathed Bi-2223 tapes were fabricated by powder in tube(PIT)process.The influences of cooling rate during the second heat treatment process(HT2)on the phase composition,microstructures and transport properties of Bi-2223/Ag Au tapes were investigated.Results show that after the HT2 process,the content of Pb-rich Pb3Sr2.5Bi0.5Ca2Cu Oy(3321)phase increases with the decreasing cooling rate,while the size of CuO phase particles becomes bigger.With the cooling rate decreasing from 600℃/h by 1℃/h,the critical current density Jc increases from 7 kA/cm^2 to the maximum value of 11.5 kA/cm^2,which increases by 64%.Meanwhile the current capacities in magnetic field of these Bi-2223/AgAu tapes have also been enhanced with slow cooling process,attributed to the improvements of both the intergrain connectivity and the flux pinning properties.

关 键 词：高温超导 (Bi Pb)-2223/AgAu带材 降温速率 微观结构 临界电流密度 

分 类 号：TB33[一般工业技术—材料科学与工程]