Investigation on drawing process of Bi-2223/Ag wires using racetrack-type dies:Simulation and experiments  

作　　者：LU YongJin ZENG Pan LEI LiPing QU TiMing FANG Gang SUN JianFeng 

机构地区：[1]Key Laboratory for Advanced Materials Processing Technology,Tsinghua University,Beijing 100084,China [2]Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China [3]Innova Superconductor Technology Co.Ltd.,Beijing 100176,China

出　　处：《Science China(Technological Sciences)》2009年第8期2255-2262,共8页中国科学（技术科学英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 50635050)

摘　　要：The traditional rolling process of Bi-2223/Ag wires with circular sections is an inhomogeneous process. For the purpose of achieving a uniform filaments distribution, a novel technique for round wire through racetrack-type dies during the last several passes of drawing is necessarily brought forward. In order to investigate the processing behaviors of superconducting filaments, a numerical model for the three passes of racetrack drawing was constructed, and subsequently, the optimization of three racetrack-type dies was designed based on the simulation results. Then the three passes of racetrack drawing was applied to fabricate Bi-2223/Ag tape and the density distribution of each filament of the wire was studied by Vickers microhardness. The experimental results showed that the racetrack drawing can obtain dense superconducting filaments, and improve the mechanical properties and critical current of the final tape.The traditional rolling process of Bi-2223/Ag wires with circular sections is an inhomogeneous process. For the purpose of achieving a uniform filaments distribution, a novel technique for round wire through racetrack-type dies during the last several passes of drawing is necessarily brought forward. In order to investigate the processing behaviors of superconducting filaments, a numerical model for the three passes of racetrack drawing was constructed, and subsequently, the optimization of three racetrack-type dies was designed based on the simulation results. Then the three passes of racetrack drawing was applied to fabricate Bi-2223/Ag tape and the density distribution of each filament of the wire was studied by Vickers microhardness. The experimental results showed that the racetrack drawing can obtain dense superconducting filaments, and improve the mechanical properties and critical current of the final tape.

关 键 词：racetrack-type DIE BI-2223/AG MODELLING 

分 类 号：TB33[一般工业技术—材料科学与工程]