Heat treatment on phase evolution of Bi-2223 precursor powder prepared by spray pyrolysis method  

作　　者：Li-Jun Cui Ping-Xiang Zhang Jin-Shan Li Guo Yan Yong Feng Xiang-Hong Liu Jian-Feng Li Xi-Feng Pan Fan Yang Sheng-Nan Zhang Xiao-Bo Ma Guo-Qing Liu 崔利军;张平祥;李金山;闫果;冯勇;刘向宏;李建峰;潘熙峰;杨帆;张胜楠;马晓波;刘国庆(State Key Laboratory of Solidification Processing Northwestern Polytechnical University;National Engineering Laboratory for Superconducting Materials (NELSM) Western Superconducting Technologies (WST) Co.Ltd.;Superconducting Materials Center Northwest Institute for Nonferrous Metal Research)

机构地区：[1]State Key Laboratory of Solidification Processing Northwestern Polytechnical University [2]National Engineering Laboratory for Superconducting Materials (NELSM) Western Superconducting Technologies (WST) Co.Ltd. [3]Superconducting Materials Center Northwest Institute for Nonferrous Metal Research

出　　处：《Chinese Physics B》2019年第4期332-336,共5页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2017YFB0902303);the Key Research and Development Program of Shaanxi Province,China(Grant No.2018GY-121N);the National Key Project of Magneto Constrained Fusion Energy Development Program,China(Grant No.2015GB115001)

摘　　要：The phase evolution of Bi-2223 precursor powder prepared by spray pyrolysis method is studied with different heat treatment parameters. The results show that the reaction temperature and phase composition of precursor powder depend on heat treatment atmosphere. Phase assemblage of(Bi,Pb)-2212, AEC, CuO, and small Bi-2201 can be obtained by heat-treated in N2-0.1%O_2 atmosphere. For precursor powder, there is sufficient reaction process at 770℃, and the dimension of Bi-2212 phase increases rapidly with the increase of heat treatment temperature and time. The dimension of AEC phase also increases by extending heat treatment time. As a balance among phase assemblage, dimension of particle and adequate reaction, a reasonable precursor powder can be obtained by heat-treated at 770℃ for 12 h–16 h in N2-0.1%O_2 atmosphere. Critical current of 37-filament Bi-2223 tape is about 120 A, which confirms that these heat treatment parameters are reasonable.The phase evolution of Bi-2223 precursor powder prepared by spray pyrolysis method is studied with different heat treatment parameters. The results show that the reaction temperature and phase composition of precursor powder depend on heat treatment atmosphere. Phase assemblage of(Bi,Pb)-2212, AEC, CuO, and small Bi-2201 can be obtained by heat-treated in N2-0.1%O_2 atmosphere. For precursor powder, there is sufficient reaction process at 770℃, and the dimension of Bi-2212 phase increases rapidly with the increase of heat treatment temperature and time. The dimension of AEC phase also increases by extending heat treatment time. As a balance among phase assemblage, dimension of particle and adequate reaction, a reasonable precursor powder can be obtained by heat-treated at 770℃ for 12 h–16 h in N2-0.1%O_2 atmosphere. Critical current of 37-filament Bi-2223 tape is about 120 A, which confirms that these heat treatment parameters are reasonable.

关 键 词：BI-2223 phase evolution HEAT treatment SPRAY PYROLYSIS 

分 类 号：O4[理学—物理]