部分熔化热处理工艺对Bi-2212/Ag带材J_(c)性能的影响(英文)  

Effects of Partial Melting Process on J_(c)of Bi-2212/Ag Tapes

作　　者：刘育松[1,2] 张平祥 李成山[1] 于泽铭[1] 郑会玲[1] 熊晓梅[1] 刘奉生[1] 王庆阳[1] 姜冰[1,2] 冯勇[1] 周廉 

机构地区：[1]西北有色金属研究院,西安710016 [2]东北大学材料与冶金学院,沈阳110006

出　　处：《稀有金属材料与工程》2004年第8期793-796,共4页Rare Metal Materials and Engineering

基　　金：National Key Basic Research Project‘973’(G19990646-05)

摘　　要：为了提高Bi-2212/Ag带的性能(主要指临界电流密度Jc),进行了部分熔化热处理工艺对带材Jc的实验.采用标准的4点法测量Jc,使用PW1700 XRD、SL20 SEM和EDX检验和研究带材的相组成和微观组织.实验表明:在流氧气氛下,烧结温度为860℃～880℃时,前驱粉末以Bi-2212为主相,同时含有少量的Bi-2201相、(Sr,Ca)Cu2O3相和富(Bi,Sr)相.在流氧气氛下,带材Jc性能对热处理工艺参数非常敏感.在实验条件范围内,优化后的热处理工艺参数为:熔化温度Tmax=890℃,熔化时间tmax＝10 min,冷却速率Rc＝2℃h-1;在保温温度为835℃时,保温时间ta=20 h,通过优化的部分熔化热处理工艺,在77 K、0 T下最后所制得带材的最大Ic=6 A,Jc=890 Acm-2.In order to improve the performances of Bi-2212/Ag tapes (mainly refer to crital current density J(c)), the experiment for effects of partial melting process on J(c) of the tapes was conducted. Standard 4-point method was used to measure J(c). PW1700 XRD, XL20 SEM and EDX were used to exam and study phase constitution and microstructure of the tapes. The results indicate that sintered at 860degreesCsimilar to880degreesC in flowing oxygen atmosphere, Bi-2212 precursors have primary phase of Bi-2212 and a slight amount of Bi-2201 phase, (Sr, Ca) Cu2O3 phase and rich (Bi,Sr) phase. In flowing oxygen atmosphere, processing parameters have critical effects on J(c) of the Bi-2212/Ag tape. The optimized processing parameters are that melting temperature T-max is 890 degreesC, melting time t(max) is 10 min and cooling rate R-c is 2degreesC/h. At 835degreesC, the optimized holding time to is 20 h. By optimizing partial melting process, the maximum J(c) of the final tapes is 6 A and J(c) is 890 A/cm(2) at 77 K, 0 T.

关 键 词：前驱粉末 Bi-2212/Ag带材 部分熔化 

分 类 号：TG156[金属学及工艺—热处理]