前驱粉末对(Bi,Pb)-2223/Ag超导带材临界电流密度的影响  

EFFECTS OF THE PRECURSOR POWDER ON CRITICAL CURRENT DENSITY OF (Bi,Pb)-2223 TAPES

作　　者：徐晓燕[1] 郑会玲[1] 刘奉生[1] 郝清滨[1] 熊晓梅[1] 郑俊涛[1] 李成山[1] 纪平[1] 卢亚锋[1] 张平祥[1] 周廉[1] 

机构地区：[1]西北有色金属研究院,西安710016

出　　处：《低温物理学报》2005年第A02期834-838,共5页Low Temperature Physical Letters

基　　金：国家"863"计划(2003AA306120)资助项目

摘　　要：采用双相粉工艺即分别制备出2212粉末和(Ca2CuO3+CuO)粉末,将它们分别热处理后,按照2223比例混合均匀,分别在四个不同温度下(800℃,815℃,830℃,845℃)进行了10h的烧结,并采用PIT技术制备出37芯超导带材.通过X射线衍射、SEM观察和临界电流的测试,分析了粉末不同烧结温度对(Bi,Pb)-2223/Ag超导带材临界电流密度的影响.结果表明:采用不同的前驱粉末制备的带材具有不同的临界电流密度,最佳的前驱粉末最终烧结温度是830℃左右.The effects of the precursor powder on Bi-2223 phase formation and the superconducting of Ag sheathed Bi-2223 tapes were studied. The precursor powder was prepared by the “two-powder” method, in which 2212 powder and （Ca2CuO3＋CuO） powder were mixed. The different phase assemblage of the precursor powder could controlled by changing the calcination temperatures from 800℃ to 845℃. Ag sheathed tapes were obtained by the powderin-tube technique （PIT）. The precursor powders and tapes were characterized by XRD and SEM with EDX analysis. The results have showed that the phase transformation, microstructure and transport properties of tapes were strongly dependent on the phase composition of precursor powder. Different calcination conditions determined the different reactivity of precursor and the different final properties of the Bi-2223/Ag tapes. The optimal temperature of precursor powder for manufacturing Bi-2223/Ag tapes was about 830℃.

关 键 词：BI-2223带材 前驱粉末 热处理 临界电流密度 

分 类 号：O511.3[一般工业技术—材料科学与工程]