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.
作者
马小波
张胜楠
于泽明
刘国庆
焦磊
郑会玲
李成山
张平祥
李金山
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)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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)
